Use more concise stdlib type aliases

examples/Plugins/SamplerPluginDemo.h

@@ -159,7 +159,7 @@ private:
     template <typename Func>
     static std::unique_ptr<Command<Proc>> makeCommand (Func&& func)
     {
-        using Decayed = typename std::decay<Func>::type;
+        using Decayed = std::decay_t<Func>;
         return std::make_unique<TemplateCommand<Proc, Decayed>> (std::forward<Func> (func));
     }
 

extras/Build/juceaide/Main.cpp

@@ -530,7 +530,7 @@ int main (int argc, char** argv)
         juce::ArgumentList argumentList { arguments.front(),
                                           juce::StringArray (arguments.data() + 1, (int) arguments.size() - 1) };
 
-        using Fn = std::add_lvalue_reference<decltype (writeBinaryData)>::type;
+        using Fn = int (*) (juce::ArgumentList&&);
 
         const std::unordered_map<juce::String, Fn> commands
         {

modules/juce_audio_basics/buffers/juce_AudioSampleBuffer.h

@@ -1177,7 +1177,7 @@ private:
         jassert (size >= 0);
 
         auto channelListSize = (size_t) (numChannels + 1) * sizeof (Type*);
-        auto requiredSampleAlignment = std::alignment_of<Type>::value;
+        auto requiredSampleAlignment = std::alignment_of_v<Type>;
         size_t alignmentOverflow = channelListSize % requiredSampleAlignment;
 
         if (alignmentOverflow != 0)

modules/juce_audio_basics/midi/ump/juce_UMP_test.cpp

@@ -992,7 +992,7 @@ private:
 
    #if JUCE_WINDOWS && ! JUCE_MINGW
     #define JUCE_CHECKED_ITERATOR(msg, size) \
-        stdext::checked_array_iterator<typename std::remove_reference<decltype (msg)>::type> ((msg), (size_t) (size))
+        stdext::checked_array_iterator<std::remove_reference_t<decltype (msg)>> ((msg), (size_t) (size))
    #else
     #define JUCE_CHECKED_ITERATOR(msg, size) (msg)
    #endif

modules/juce_audio_basics/midi/ump/juce_UMPacket.h

@@ -38,35 +38,35 @@ class Packet
 public:
     Packet() = default;
 
-    template <size_t w = numWords, typename std::enable_if<w == 1, int>::type = 0>
+    template <size_t w = numWords, std::enable_if_t<w == 1, int> = 0>
     Packet (uint32_t a)
         : contents { { a } }
     {
         jassert (Utils::getNumWordsForMessageType (a) == 1);
     }
 
-    template <size_t w = numWords, typename std::enable_if<w == 2, int>::type = 0>
+    template <size_t w = numWords, std::enable_if_t<w == 2, int> = 0>
     Packet (uint32_t a, uint32_t b)
         : contents { { a, b } }
     {
         jassert (Utils::getNumWordsForMessageType (a) == 2);
     }
 
-    template <size_t w = numWords, typename std::enable_if<w == 3, int>::type = 0>
+    template <size_t w = numWords, std::enable_if_t<w == 3, int> = 0>
     Packet (uint32_t a, uint32_t b, uint32_t c)
         : contents { { a, b, c } }
     {
         jassert (Utils::getNumWordsForMessageType (a) == 3);
     }
 
-    template <size_t w = numWords, typename std::enable_if<w == 4, int>::type = 0>
+    template <size_t w = numWords, std::enable_if_t<w == 4, int> = 0>
     Packet (uint32_t a, uint32_t b, uint32_t c, uint32_t d)
         : contents { { a, b, c, d } }
     {
         jassert (Utils::getNumWordsForMessageType (a) == 4);
     }
 
-    template <size_t w, typename std::enable_if<w == numWords, int>::type = 0>
+    template <size_t w, std::enable_if_t<w == numWords, int> = 0>
     explicit Packet (const std::array<uint32_t, w>& fullPacket)
         : contents (fullPacket)
     {

modules/juce_audio_basics/utilities/juce_SmoothedValue.h

@@ -229,7 +229,7 @@ public:
     //==============================================================================
     /** Constructor. */
     SmoothedValue() noexcept
-        : SmoothedValue ((FloatType) (std::is_same<SmoothingType, ValueSmoothingTypes::Linear>::value ? 0 : 1))
+        : SmoothedValue ((FloatType) (std::is_same_v<SmoothingType, ValueSmoothingTypes::Linear> ? 0 : 1))
     {
     }
 
@@ -237,7 +237,7 @@ public:
     SmoothedValue (FloatType initialValue) noexcept
     {
         // Multiplicative smoothed values cannot ever reach 0!
-        jassert (! (std::is_same<SmoothingType, ValueSmoothingTypes::Multiplicative>::value && initialValue == 0));
+        jassert (! (std::is_same_v<SmoothingType, ValueSmoothingTypes::Multiplicative> && initialValue == 0));
 
         // Visual Studio can't handle base class initialisation with CRTP
         this->currentValue = initialValue;
@@ -280,7 +280,7 @@ public:
         }
 
         // Multiplicative smoothed values cannot ever reach 0!
-        jassert (! (std::is_same<SmoothingType, ValueSmoothingTypes::Multiplicative>::value && newValue == 0));
+        jassert (! (std::is_same_v<SmoothingType, ValueSmoothingTypes::Multiplicative> && newValue == 0));
 
         this->target = newValue;
         this->countdown = stepsToTarget;
@@ -352,49 +352,45 @@ public:
 
 private:
     //==============================================================================
-    template <typename T>
-    using LinearVoid = typename std::enable_if <std::is_same <T, ValueSmoothingTypes::Linear>::value, void>::type;
-
-    template <typename T>
-    using MultiplicativeVoid = typename std::enable_if <std::is_same <T, ValueSmoothingTypes::Multiplicative>::value, void>::type;
-
-    //==============================================================================
-    template <typename T = SmoothingType>
-    LinearVoid<T> setStepSize() noexcept
-    {
-        step = (this->target - this->currentValue) / (FloatType) this->countdown;
-    }
-
     template <typename T = SmoothingType>
-    MultiplicativeVoid<T> setStepSize()
+    void setStepSize() noexcept
     {
-        step = std::exp ((std::log (std::abs (this->target)) - std::log (std::abs (this->currentValue))) / (FloatType) this->countdown);
+        if constexpr (std::is_same_v<T, ValueSmoothingTypes::Linear>)
+        {
+            step = (this->target - this->currentValue) / (FloatType) this->countdown;
+        }
+        else if constexpr (std::is_same_v<T, ValueSmoothingTypes::Multiplicative>)
+        {
+            step = std::exp ((std::log (std::abs (this->target)) - std::log (std::abs (this->currentValue))) / (FloatType) this->countdown);
+        }
     }
 
     //==============================================================================
     template <typename T = SmoothingType>
-    LinearVoid<T> setNextValue() noexcept
+    void setNextValue() noexcept
     {
-        this->currentValue += step;
-    }
-
-    template <typename T = SmoothingType>
-    MultiplicativeVoid<T> setNextValue() noexcept
-    {
-        this->currentValue *= step;
+        if constexpr (std::is_same_v<T, ValueSmoothingTypes::Linear>)
+        {
+            this->currentValue += step;
+        }
+        else if constexpr (std::is_same_v<T, ValueSmoothingTypes::Multiplicative>)
+        {
+            this->currentValue *= step;
+        }
     }
 
     //==============================================================================
     template <typename T = SmoothingType>
-    LinearVoid<T> skipCurrentValue (int numSamples) noexcept
+    void skipCurrentValue (int numSamples) noexcept
     {
-        this->currentValue += step * (FloatType) numSamples;
-    }
-
-    template <typename T = SmoothingType>
-    MultiplicativeVoid<T> skipCurrentValue (int numSamples)
-    {
-        this->currentValue *= (FloatType) std::pow (step, numSamples);
+        if constexpr (std::is_same_v<T, ValueSmoothingTypes::Linear>)
+        {
+            this->currentValue += step * (FloatType) numSamples;
+        }
+        else if constexpr (std::is_same_v<T, ValueSmoothingTypes::Multiplicative>)
+        {
+            this->currentValue *= (FloatType) std::pow (step, numSamples);
+        }
     }
 
     //==============================================================================

modules/juce_audio_processors/format_types/juce_LV2PluginFormat.cpp

@@ -944,9 +944,10 @@ struct WorkSubmitter
     CriticalSection* workMutex;
 };
 
-template <typename Trivial, std::enable_if_t<std::is_trivial<Trivial>::value, int> = 0>
+template <typename Trivial>
 static auto toChars (Trivial value)
 {
+    static_assert (std::is_trivial_v<Trivial>);
     std::array<char, sizeof (Trivial)> result;
     writeUnaligned (result.data(), value);
     return result;
@@ -956,7 +957,7 @@ template <typename Context>
 class WorkQueue
 {
 public:
-    static_assert (std::is_trivial<Context>::value, "Context must be copyable as bytes");
+    static_assert (std::is_trivial_v<Context>, "Context must be copyable as bytes");
 
     explicit WorkQueue (int size)
         : fifo (size), data (static_cast<size_t> (size)) {}
@@ -3657,8 +3658,8 @@ private:
 
     union Data
     {
-        static_assert (std::is_trivial<PortBacking>::value,  "PortBacking must be trivial");
-        static_assert (std::is_trivial<PatchBacking>::value, "PatchBacking must be trivial");
+        static_assert (std::is_trivial_v<PortBacking>,  "PortBacking must be trivial");
+        static_assert (std::is_trivial_v<PatchBacking>, "PatchBacking must be trivial");
 
         explicit Data (PortBacking p)  : port  (p) {}
         explicit Data (PatchBacking p) : patch (p) {}

modules/juce_audio_processors/utilities/ARA/juce_ARADocumentController.h

@@ -123,7 +123,7 @@ public:
     template <typename SpecialisationType>
     static const ARA::ARAFactory* createARAFactory()
     {
-        static_assert (std::is_base_of<ARADocumentControllerSpecialisation, SpecialisationType>::value,
+        static_assert (std::is_base_of_v<ARADocumentControllerSpecialisation, SpecialisationType>,
                        "DocumentController specialization types must inherit from ARADocumentControllerSpecialisation");
         return ARA::PlugIn::PlugInEntry::getPlugInEntry<FactoryConfig<SpecialisationType>>()->getFactory();
     }

modules/juce_core/containers/juce_Array.h

@@ -649,7 +649,7 @@ public:
         @see add
     */
     template <class OtherArrayType>
-    typename std::enable_if<! std::is_pointer<OtherArrayType>::value, void>::type
+    std::enable_if_t<! std::is_pointer_v<OtherArrayType>, void>
     addArray (const OtherArrayType& arrayToAddFrom,
               int startIndex,
               int numElementsToAdd = -1)

modules/juce_core/containers/juce_ArrayBase.cpp

@@ -105,9 +105,9 @@ class ArrayBaseTests  : public UnitTest
     using NoncopyableType = ArrayBaseTestsHelpers::NonTriviallyCopyableType;
 
    #if ! (defined(__GNUC__) && __GNUC__ < 5 && ! defined(__clang__))
-    static_assert (std::is_trivially_copyable<CopyableType>::value,
+    static_assert (std::is_trivially_copyable_v<CopyableType>,
                    "Test TriviallyCopyableType is not trivially copyable");
-    static_assert (! std::is_trivially_copyable<NoncopyableType>::value,
+    static_assert (! std::is_trivially_copyable_v<NoncopyableType>,
                    "Test NonTriviallyCopyableType is trivially copyable");
    #endif
 

modules/juce_core/containers/juce_ArrayBase.h

@@ -43,8 +43,8 @@ private:
     using ParameterType = typename TypeHelpers::ParameterType<ElementType>::type;
 
     template <class OtherElementType, class OtherCriticalSection>
-    using AllowConversion = typename std::enable_if<! std::is_same<std::tuple<ElementType, TypeOfCriticalSectionToUse>,
-                                                                   std::tuple<OtherElementType, OtherCriticalSection>>::value>::type;
+    using AllowConversion = std::enable_if_t<! std::is_same_v<std::tuple<ElementType, TypeOfCriticalSectionToUse>,
+                                                              std::tuple<OtherElementType, OtherCriticalSection>>>;
 
 public:
     //==============================================================================
@@ -304,7 +304,7 @@ public:
     }
 
     template <class OtherArrayType>
-    typename std::enable_if<! std::is_pointer<OtherArrayType>::value, int>::type
+    std::enable_if_t<! std::is_pointer_v<OtherArrayType>, int>
     addArray (const OtherArrayType& arrayToAddFrom,
               int startIndex, int numElementsToAdd = -1)
     {
@@ -385,64 +385,49 @@ public:
 
 private:
     //==============================================================================
-    template <typename T>
    #if defined(__GNUC__) && __GNUC__ < 5 && ! defined(__clang__)
-    using IsTriviallyCopyable = std::is_scalar<T>;
+    static constexpr auto isTriviallyCopyable = std::is_scalar_v<ElementType>;
    #else
-    using IsTriviallyCopyable = std::is_trivially_copyable<T>;
+    static constexpr auto isTriviallyCopyable = std::is_trivially_copyable_v<ElementType>;
    #endif
 
-    template <typename T>
-    using TriviallyCopyableVoid = typename std::enable_if<IsTriviallyCopyable<T>::value, void>::type;
-
-    template <typename T>
-    using NonTriviallyCopyableVoid = typename std::enable_if<! IsTriviallyCopyable<T>::value, void>::type;
-
     //==============================================================================
-    template <typename T = ElementType>
-    TriviallyCopyableVoid<T> addArrayInternal (const ElementType* otherElements, int numElements)
-    {
-        if (numElements > 0)
-            memcpy (elements + numUsed, otherElements, (size_t) numElements * sizeof (ElementType));
-    }
-
-    template <typename Type, typename T = ElementType>
-    TriviallyCopyableVoid<T> addArrayInternal (const Type* otherElements, int numElements)
-    {
-        auto* start = elements + numUsed;
-
-        while (--numElements >= 0)
-            new (start++) ElementType (*(otherElements++));
-    }
-
-    template <typename Type, typename T = ElementType>
-    NonTriviallyCopyableVoid<T> addArrayInternal (const Type* otherElements, int numElements)
+    template <typename Type>
+    void addArrayInternal (const Type* otherElements, int numElements)
     {
-        auto* start = elements + numUsed;
+        if constexpr (isTriviallyCopyable && std::is_same_v<Type, ElementType>)
+        {
+            if (numElements > 0)
+                memcpy (elements + numUsed, otherElements, (size_t) numElements * sizeof (ElementType));
+        }
+        else
+        {
+            auto* start = elements + numUsed;
 
-        while (--numElements >= 0)
-            new (start++) ElementType (*(otherElements++));
+            while (--numElements >= 0)
+                new (start++) ElementType (*(otherElements++));
+        }
     }
 
     //==============================================================================
-    template <typename T = ElementType>
-    TriviallyCopyableVoid<T> setAllocatedSizeInternal (int numElements)
+    void setAllocatedSizeInternal (int numElements)
     {
-        elements.realloc ((size_t) numElements);
-    }
-
-    template <typename T = ElementType>
-    NonTriviallyCopyableVoid<T> setAllocatedSizeInternal (int numElements)
-    {
-        HeapBlock<ElementType> newElements (numElements);
-
-        for (int i = 0; i < numUsed; ++i)
+        if constexpr (isTriviallyCopyable)
         {
-            new (newElements + i) ElementType (std::move (elements[i]));
-            elements[i].~ElementType();
+            elements.realloc ((size_t) numElements);
         }
+        else
+        {
+            HeapBlock<ElementType> newElements (numElements);
+
+            for (int i = 0; i < numUsed; ++i)
+            {
+                new (newElements + i) ElementType (std::move (elements[i]));
+                elements[i].~ElementType();
+            }
 
-        elements = std::move (newElements);
+            elements = std::move (newElements);
+        }
     }
 
     //==============================================================================
@@ -458,99 +443,99 @@ private:
         return elements + indexToInsertAt;
     }
 
-    template <typename T = ElementType>
-    TriviallyCopyableVoid<T> createInsertSpaceInternal (int indexToInsertAt, int numElements)
-    {
-        auto* start = elements + indexToInsertAt;
-        auto numElementsToShift = numUsed - indexToInsertAt;
-        memmove (start + numElements, start, (size_t) numElementsToShift * sizeof (ElementType));
-    }
-
-    template <typename T = ElementType>
-    NonTriviallyCopyableVoid<T> createInsertSpaceInternal (int indexToInsertAt, int numElements)
+    void createInsertSpaceInternal (int indexToInsertAt, int numElements)
     {
-        auto* end = elements + numUsed;
-        auto* newEnd = end + numElements;
-        auto numElementsToShift = numUsed - indexToInsertAt;
-
-        for (int i = 0; i < numElementsToShift; ++i)
+        if constexpr (isTriviallyCopyable)
         {
-            new (--newEnd) ElementType (std::move (*(--end)));
-            end->~ElementType();
+            auto* start = elements + indexToInsertAt;
+            auto numElementsToShift = numUsed - indexToInsertAt;
+            memmove (start + numElements, start, (size_t) numElementsToShift * sizeof (ElementType));
         }
-    }
-
-    //==============================================================================
-    template <typename T = ElementType>
-    TriviallyCopyableVoid<T> removeElementsInternal (int indexToRemoveAt, int numElementsToRemove)
-    {
-        auto* start = elements + indexToRemoveAt;
-        auto numElementsToShift = numUsed - (indexToRemoveAt + numElementsToRemove);
-        memmove (start, start + numElementsToRemove, (size_t) numElementsToShift * sizeof (ElementType));
-    }
-
-    template <typename T = ElementType>
-    NonTriviallyCopyableVoid<T> removeElementsInternal (int indexToRemoveAt, int numElementsToRemove)
-    {
-        auto numElementsToShift = numUsed - (indexToRemoveAt + numElementsToRemove);
-        auto* destination = elements + indexToRemoveAt;
-        auto* source = destination + numElementsToRemove;
-
-        for (int i = 0; i < numElementsToShift; ++i)
-            moveAssignElement (destination++, std::move (*(source++)));
+        else
+        {
+            auto* end = elements + numUsed;
+            auto* newEnd = end + numElements;
+            auto numElementsToShift = numUsed - indexToInsertAt;
 
-        for (int i = 0; i < numElementsToRemove; ++i)
-            (destination++)->~ElementType();
+            for (int i = 0; i < numElementsToShift; ++i)
+            {
+                new (--newEnd) ElementType (std::move (*(--end)));
+                end->~ElementType();
+            }
+        }
     }
 
     //==============================================================================
-    template <typename T = ElementType>
-    TriviallyCopyableVoid<T> moveInternal (int currentIndex, int newIndex) noexcept
+    void removeElementsInternal (int indexToRemoveAt, int numElementsToRemove)
     {
-        char tempCopy[sizeof (ElementType)];
-        memcpy (tempCopy, elements + currentIndex, sizeof (ElementType));
-
-        if (newIndex > currentIndex)
+        if constexpr (isTriviallyCopyable)
         {
-            memmove (elements + currentIndex,
-                     elements + currentIndex + 1,
-                     (size_t) (newIndex - currentIndex) * sizeof (ElementType));
+            auto* start = elements + indexToRemoveAt;
+            auto numElementsToShift = numUsed - (indexToRemoveAt + numElementsToRemove);
+            memmove (start, start + numElementsToRemove, (size_t) numElementsToShift * sizeof (ElementType));
         }
         else
         {
-            memmove (elements + newIndex + 1,
-                     elements + newIndex,
-                     (size_t) (currentIndex - newIndex) * sizeof (ElementType));
-        }
+            auto numElementsToShift = numUsed - (indexToRemoveAt + numElementsToRemove);
+            auto* destination = elements + indexToRemoveAt;
+            auto* source = destination + numElementsToRemove;
 
-        memcpy (elements + newIndex, tempCopy, sizeof (ElementType));
+            for (int i = 0; i < numElementsToShift; ++i)
+                moveAssignElement (destination++, std::move (*(source++)));
+
+            for (int i = 0; i < numElementsToRemove; ++i)
+                (destination++)->~ElementType();
+        }
     }
 
-    template <typename T = ElementType>
-    NonTriviallyCopyableVoid<T> moveInternal (int currentIndex, int newIndex) noexcept
+    //==============================================================================
+    void moveInternal (int currentIndex, int newIndex) noexcept
     {
-        auto* e = elements + currentIndex;
-        ElementType tempCopy (std::move (*e));
-        auto delta = newIndex - currentIndex;
-
-        if (delta > 0)
+        if constexpr (isTriviallyCopyable)
         {
-            for (int i = 0; i < delta; ++i)
+            char tempCopy[sizeof (ElementType)];
+            memcpy (tempCopy, elements + currentIndex, sizeof (ElementType));
+
+            if (newIndex > currentIndex)
             {
-                moveAssignElement (e, std::move (*(e + 1)));
-                ++e;
+                memmove (elements + currentIndex,
+                         elements + currentIndex + 1,
+                         (size_t) (newIndex - currentIndex) * sizeof (ElementType));
             }
+            else
+            {
+                memmove (elements + newIndex + 1,
+                         elements + newIndex,
+                         (size_t) (currentIndex - newIndex) * sizeof (ElementType));
+            }
+
+            memcpy (elements + newIndex, tempCopy, sizeof (ElementType));
         }
         else
         {
-            for (int i = 0; i < -delta; ++i)
+            auto* e = elements + currentIndex;
+            ElementType tempCopy (std::move (*e));
+            auto delta = newIndex - currentIndex;
+
+            if (delta > 0)
             {
-                moveAssignElement (e, std::move (*(e - 1)));
-                --e;
+                for (int i = 0; i < delta; ++i)
+                {
+                    moveAssignElement (e, std::move (*(e + 1)));
+                    ++e;
+                }
+            }
+            else
+            {
+                for (int i = 0; i < -delta; ++i)
+                {
+                    moveAssignElement (e, std::move (*(e - 1)));
+                    --e;
+                }
             }
-        }
 
-        moveAssignElement (e, std::move (tempCopy));
+            moveAssignElement (e, std::move (tempCopy));
+        }
     }
 
     //==============================================================================
@@ -569,19 +554,17 @@ private:
     }
 
     //==============================================================================
-    template <typename T = ElementType>
-    typename std::enable_if<std::is_move_assignable<T>::value, void>::type
-    moveAssignElement (ElementType* destination, ElementType&& source)
+    void moveAssignElement (ElementType* destination, ElementType&& source)
     {
-        *destination = std::move (source);
-    }
-
-    template <typename T = ElementType>
-    typename std::enable_if<! std::is_move_assignable<T>::value, void>::type
-    moveAssignElement (ElementType* destination, ElementType&& source)
-    {
-        destination->~ElementType();
-        new (destination) ElementType (std::move (source));
+        if constexpr (std::is_move_assignable_v<ElementType>)
+        {
+            *destination = std::move (source);
+        }
+        else
+        {
+            destination->~ElementType();
+            new (destination) ElementType (std::move (source));
+        }
     }
 
     void checkSourceIsNotAMember (const ElementType& element)

modules/juce_core/containers/juce_Optional.h

@@ -53,8 +53,8 @@ JUCE_BEGIN_IGNORE_WARNINGS_MSVC (4702)
 template <typename Value>
 class Optional
 {
-    template <typename> struct IsOptional : std::false_type {};
-    template <typename T> struct IsOptional<Optional<T>> : std::true_type {};
+    template <typename>   struct IsOptional              : std::false_type {};
+    template <typename T> struct IsOptional<Optional<T>> : std::true_type  {};
 
 public:
     Optional() = default;

modules/juce_core/maths/juce_MathsFunctions.h

@@ -654,11 +654,8 @@ namespace TypeHelpers
 
         @tags{Core}
     */
-    template <typename Type> struct SmallestFloatType               { using type = float; };
-
-   #ifndef DOXYGEN
-    template <>              struct SmallestFloatType <double>      { using type = double; };
-   #endif
+    template <typename Type>
+    using SmallestFloatType = std::conditional_t<std::is_same_v<Type, double>, double, float>;
 
     /** These templates are designed to take an integer type, and return an unsigned int
         version with the same size.

modules/juce_core/maths/juce_Range.h

@@ -270,7 +270,7 @@ public:
     }
 
     /** Scans an array of values for its min and max, and returns these as a Range. */
-    template <typename Integral, std::enable_if_t<std::is_integral<Integral>::value, int> = 0>
+    template <typename Integral, std::enable_if_t<std::is_integral_v<Integral>, int> = 0>
     static Range findMinAndMax (const ValueType* values, Integral numValues) noexcept
     {
         if (numValues <= 0)

modules/juce_core/memory/juce_HeapBlock.h

@@ -87,8 +87,8 @@ class HeapBlock
 {
 private:
     template <class OtherElementType>
-    using AllowConversion = typename std::enable_if<std::is_base_of<typename std::remove_pointer<ElementType>::type,
-                                                                    typename std::remove_pointer<OtherElementType>::type>::value>::type;
+    using AllowConversion = std::enable_if_t<std::is_base_of_v<std::remove_pointer_t<ElementType>,
+                                                               std::remove_pointer_t<OtherElementType>>>;
 
 public:
     //==============================================================================
@@ -107,7 +107,7 @@ public:
         If you want an array of zero values, you can use the calloc() method or the
         other constructor that takes an InitialisationState parameter.
     */
-    template <typename SizeType, std::enable_if_t<std::is_convertible<SizeType, int>::value, int> = 0>
+    template <typename SizeType, std::enable_if_t<std::is_convertible_v<SizeType, int>, int> = 0>
     explicit HeapBlock (SizeType numElements)
         : data (static_cast<ElementType*> (std::malloc (static_cast<size_t> (numElements) * sizeof (ElementType))))
     {
@@ -119,7 +119,7 @@ public:
         The initialiseToZero parameter determines whether the new memory should be cleared,
         or left uninitialised.
     */
-    template <typename SizeType, std::enable_if_t<std::is_convertible<SizeType, int>::value, int> = 0>
+    template <typename SizeType, std::enable_if_t<std::is_convertible_v<SizeType, int>, int> = 0>
     HeapBlock (SizeType numElements, bool initialiseToZero)
         : data (static_cast<ElementType*> (initialiseToZero
                                                ? std::calloc (static_cast<size_t> (numElements), sizeof (ElementType))
@@ -152,7 +152,7 @@ public:
 
     /** Converting move constructor.
         Only enabled if this is a HeapBlock<Base*> and the other object is a HeapBlock<Derived*>,
-        where std::is_base_of<Base, Derived>::value == true.
+        where std::is_base_of_v<Base, Derived> == true.
     */
     template <class OtherElementType, bool otherThrowOnFailure, typename = AllowConversion<OtherElementType>>
     HeapBlock (HeapBlock<OtherElementType, otherThrowOnFailure>&& other) noexcept
@@ -163,7 +163,7 @@ public:
 
     /** Converting move assignment operator.
         Only enabled if this is a HeapBlock<Base*> and the other object is a HeapBlock<Derived*>,
-        where std::is_base_of<Base, Derived>::value == true.
+        where std::is_base_of_v<Base, Derived> == true.
     */
     template <class OtherElementType, bool otherThrowOnFailure, typename = AllowConversion<OtherElementType>>
     HeapBlock& operator= (HeapBlock<OtherElementType, otherThrowOnFailure>&& other) noexcept

modules/juce_core/memory/juce_Memory.h

@@ -84,9 +84,10 @@ inline void writeUnaligned (void* dstPtr, Type value) noexcept
     to a region that has suitable alignment for `Type`, e.g. regions returned from
     malloc/calloc that should be suitable for any non-over-aligned type.
 */
-template <typename Type, typename std::enable_if<std::is_pointer<Type>::value, int>::type = 0>
+template <typename Type>
 inline Type unalignedPointerCast (void* ptr) noexcept
 {
+    static_assert (std::is_pointer_v<Type>);
     return reinterpret_cast<Type> (ptr);
 }
 
@@ -97,9 +98,10 @@ inline Type unalignedPointerCast (void* ptr) noexcept
     to a region that has suitable alignment for `Type`, e.g. regions returned from
     malloc/calloc that should be suitable for any non-over-aligned type.
 */
-template <typename Type, typename std::enable_if<std::is_pointer<Type>::value, int>::type = 0>
+template <typename Type>
 inline Type unalignedPointerCast (const void* ptr) noexcept
 {
+    static_assert (std::is_pointer_v<Type>);
     return reinterpret_cast<Type> (ptr);
 }
 

modules/juce_core/misc/juce_Functional.h

@@ -30,15 +30,10 @@ namespace detail
     using Void = void;
 
     template <typename, typename = void>
-    struct EqualityComparableToNullptr
-        : std::false_type {};
+    constexpr auto equalityComparableToNullptr = false;
 
     template <typename T>
-    struct EqualityComparableToNullptr<T, Void<decltype (std::declval<T>() != nullptr)>>
-        : std::true_type {};
-
-    template <typename T>
-    constexpr bool shouldCheckAgainstNullptr = EqualityComparableToNullptr<T>::value;
+    constexpr auto equalityComparableToNullptr<T, Void<decltype (std::declval<T>() != nullptr)>> = true;
 } // namespace detail
 #endif
 
@@ -53,23 +48,22 @@ namespace detail
 */
 struct NullCheckedInvocation
 {
-    template <typename Callable, typename... Args,
-              std::enable_if_t<detail::shouldCheckAgainstNullptr<Callable>, int> = 0>
+    template <typename Callable, typename... Args>
     static void invoke (Callable&& fn, Args&&... args)
     {
-        JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Waddress")
-
-        if (fn != nullptr)
-            fn (std::forward<Args> (args)...);
+        if constexpr (detail::equalityComparableToNullptr<Callable>)
+        {
+            JUCE_BEGIN_IGNORE_WARNINGS_GCC_LIKE ("-Waddress")
 
-        JUCE_END_IGNORE_WARNINGS_GCC_LIKE
-    }
+            if (fn != nullptr)
+                fn (std::forward<Args> (args)...);
 
-    template <typename Callable, typename... Args,
-              std::enable_if_t<! detail::shouldCheckAgainstNullptr<Callable>, int> = 0>
-    static void invoke (Callable&& fn, Args&&... args)
-    {
-        fn (std::forward<Args> (args)...);
+            JUCE_END_IGNORE_WARNINGS_GCC_LIKE
+        }
+        else
+        {
+            fn (std::forward<Args> (args)...);
+        }
     }
 
     template <typename... Args>
@@ -82,7 +76,7 @@ struct NullCheckedInvocation
     Adapted from https://ericniebler.com/2013/08/07/universal-references-and-the-copy-constructo/
 */
 template <typename A, typename B>
-using DisableIfSameOrDerived = typename std::enable_if_t<! std::is_base_of<A, std::remove_reference_t<B>>::value>;
+using DisableIfSameOrDerived = std::enable_if_t<! std::is_base_of_v<A, std::remove_reference_t<B>>>;
 
 /** Copies an object, sets one of the copy's members to the specified value, and then returns the copy. */
 template <typename Object, typename OtherObject, typename Member>

modules/juce_core/native/juce_mac_CFHelpers.h

@@ -37,7 +37,7 @@ struct CFObjectDeleter
 };
 
 template <typename CFType>
-using CFUniquePtr = std::unique_ptr<typename std::remove_pointer<CFType>::type, CFObjectDeleter<CFType>>;
+using CFUniquePtr = std::unique_ptr<std::remove_pointer_t<CFType>, CFObjectDeleter<CFType>>;
 
 template <typename CFType>
 struct CFObjectHolder

modules/juce_core/text/juce_CharacterFunctions.h

@@ -490,8 +490,8 @@ public:
     template <typename ResultType>
     struct HexParser
     {
-        static_assert (std::is_unsigned<ResultType>::value, "ResultType must be unsigned because "
-                                                            "left-shifting a negative value is UB");
+        static_assert (std::is_unsigned_v<ResultType>, "ResultType must be unsigned because "
+                                                       "left-shifting a negative value is UB");
 
         template <typename CharPointerType>
         static ResultType parse (CharPointerType t) noexcept

modules/juce_core/threads/juce_CriticalSection.h

@@ -106,9 +106,9 @@ private:
     // a block of memory here that's big enough to be used internally as a windows
     // CRITICAL_SECTION structure.
     #if JUCE_64BIT
-     std::aligned_storage<44, 8>::type lock;
+     std::aligned_storage_t<44, 8> lock;
     #else
-     std::aligned_storage<24, 8>::type lock;
+     std::aligned_storage_t<24, 8> lock;
     #endif
    #else
     mutable pthread_mutex_t lock;

modules/juce_dsp/containers/juce_AudioBlock.h

@@ -31,7 +31,7 @@ namespace dsp
 #ifndef DOXYGEN
 namespace SampleTypeHelpers // Internal classes needed for handling sample type classes
 {
-    template <typename T, bool = std::is_floating_point<T>::value>
+    template <typename T, bool = std::is_floating_point_v<T>>
     struct ElementType
     {
         using Type = T;
@@ -71,10 +71,10 @@ class AudioBlock
 private:
     template <typename OtherSampleType>
     using MayUseConvertingConstructor =
-        std::enable_if_t<std::is_same<std::remove_const_t<SampleType>,
-                                      std::remove_const_t<OtherSampleType>>::value
-                             && std::is_const<SampleType>::value
-                             && ! std::is_const<OtherSampleType>::value,
+        std::enable_if_t<std::is_same_v<std::remove_const_t<SampleType>,
+                                        std::remove_const_t<OtherSampleType>>
+                             && std::is_const_v<SampleType>
+                             && ! std::is_const_v<OtherSampleType>,
                          int>;
 
 public:
@@ -337,7 +337,7 @@ public:
         SIMDRegister then incrementing dstPos by one will increase the sample position
         in the AudioBuffer's units by a factor of SIMDRegister<SampleType>::SIMDNumElements.
     */
-    void copyTo (AudioBuffer<typename std::remove_const<NumericType>::type>& dst, size_t srcPos = 0, size_t dstPos = 0,
+    void copyTo (AudioBuffer<std::remove_const_t<NumericType>>& dst, size_t srcPos = 0, size_t dstPos = 0,
                  size_t numElements = std::numeric_limits<size_t>::max()) const
     {
         auto dstlen = static_cast<size_t> (dst.getNumSamples()) / sizeFactor;
@@ -518,7 +518,7 @@ public:
 
     //==============================================================================
     /** Finds the minimum and maximum value of the buffer. */
-    Range<typename std::remove_const<NumericType>::type> findMinAndMax() const noexcept
+    Range<std::remove_const_t<NumericType>> findMinAndMax() const noexcept
     {
         if (numChannels == 0)
             return {};
@@ -559,11 +559,11 @@ public:
 
     //==============================================================================
     // This class can only be used with floating point types
-    static_assert (std::is_same<std::remove_const_t<SampleType>, float>::value
-                    || std::is_same<std::remove_const_t<SampleType>, double>::value
+    static_assert (std::is_same_v<std::remove_const_t<SampleType>, float>
+                    || std::is_same_v<std::remove_const_t<SampleType>, double>
                   #if JUCE_USE_SIMD
-                    || std::is_same<std::remove_const_t<SampleType>, SIMDRegister<float>>::value
-                    || std::is_same<std::remove_const_t<SampleType>, SIMDRegister<double>>::value
+                    || std::is_same_v<std::remove_const_t<SampleType>, SIMDRegister<float>>
+                    || std::is_same_v<std::remove_const_t<SampleType>, SIMDRegister<double>>
                   #endif
                    , "AudioBlock only supports single or double precision floating point types");
 

modules/juce_dsp/containers/juce_AudioBlock_test.cpp

@@ -319,118 +319,110 @@ public:
 
 private:
     //==============================================================================
-    template <typename T>
-    using ScalarVoid = typename std::enable_if_t <  std::is_scalar <T>::value, void>;
-
-    template <typename T>
-    using SIMDVoid   = typename std::enable_if_t <! std::is_scalar <T>::value, void>;
-
-    //==============================================================================
-    template <typename T = SampleType>
-    ScalarVoid<T> copyingTests()
+    void copyingTests()
     {
-        auto unchangedElement1 = block.getSample (0, 4);
-        auto unchangedElement2 = block.getSample (1, 1);
+        if constexpr (std::is_scalar_v<SampleType>)
+        {
+            auto unchangedElement1 = block.getSample (0, 4);
+            auto unchangedElement2 = block.getSample (1, 1);
 
-        AudioBuffer<SampleType> otherBuffer (otherData.data(), (int) otherData.size(), numSamples);
+            AudioBuffer<SampleType> otherBuffer (otherData.data(), (int) otherData.size(), numSamples);
 
-        block.copyFrom (otherBuffer, 1, 2, 2);
+            block.copyFrom (otherBuffer, 1, 2, 2);
 
-        expectEquals (block.getSample (0, 4), unchangedElement1);
-        expectEquals (block.getSample (1, 1), unchangedElement2);
-        expectEquals (block.getSample (0, 2), otherBuffer.getSample (0, 1));
-        expectEquals (block.getSample (1, 3), otherBuffer.getSample (1, 2));
+            expectEquals (block.getSample (0, 4), unchangedElement1);
+            expectEquals (block.getSample (1, 1), unchangedElement2);
+            expectEquals (block.getSample (0, 2), otherBuffer.getSample (0, 1));
+            expectEquals (block.getSample (1, 3), otherBuffer.getSample (1, 2));
 
-        resetBlocks();
-
-        unchangedElement1 = otherBuffer.getSample (0, 4);
-        unchangedElement2 = otherBuffer.getSample (1, 3);
+            resetBlocks();
 
-        block.copyTo (otherBuffer, 2, 1, 2);
+            unchangedElement1 = otherBuffer.getSample (0, 4);
+            unchangedElement2 = otherBuffer.getSample (1, 3);
 
-        expectEquals (otherBuffer.getSample (0, 4), unchangedElement1);
-        expectEquals (otherBuffer.getSample (1, 3), unchangedElement2);
-        expectEquals (otherBuffer.getSample (0, 1), block.getSample (0, 2));
-        expectEquals (otherBuffer.getSample (1, 2), block.getSample (1, 3));
-    }
+            block.copyTo (otherBuffer, 2, 1, 2);
 
-   #if JUCE_USE_SIMD
-    template <typename T = SampleType>
-    SIMDVoid<T> copyingTests()
-    {
-        auto numSIMDElements = SIMDRegister<NumericType>::SIMDNumElements;
-        AudioBuffer<NumericType> numericData ((int) block.getNumChannels(),
-                                              (int) (block.getNumSamples() * numSIMDElements));
+            expectEquals (otherBuffer.getSample (0, 4), unchangedElement1);
+            expectEquals (otherBuffer.getSample (1, 3), unchangedElement2);
+            expectEquals (otherBuffer.getSample (0, 1), block.getSample (0, 2));
+            expectEquals (otherBuffer.getSample (1, 2), block.getSample (1, 3));
+        }
+       #if JUCE_USE_SIMD
+        else
+        {
+            auto numSIMDElements = SIMDRegister<NumericType>::SIMDNumElements;
+            AudioBuffer<NumericType> numericData ((int) block.getNumChannels(),
+                                                  (int) (block.getNumSamples() * numSIMDElements));
 
-        for (int c = 0; c < numericData.getNumChannels(); ++c)
-            std::fill_n (numericData.getWritePointer (c), numericData.getNumSamples(), (NumericType) 1.0);
+            for (int c = 0; c < numericData.getNumChannels(); ++c)
+                std::fill_n (numericData.getWritePointer (c), numericData.getNumSamples(), (NumericType) 1.0);
 
-        numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 0.127, (NumericType) 17.3);
+            numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 0.127, (NumericType) 17.3);
 
-        auto lastUnchangedIndexBeforeCopiedRange = (int) ((numSIMDElements * 2) - 1);
-        auto firstUnchangedIndexAfterCopiedRange = (int) ((numSIMDElements * 4) + 1);
-        auto unchangedElement1 = numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange);
-        auto unchangedElement2 = numericData.getSample (1, firstUnchangedIndexAfterCopiedRange);
+            auto lastUnchangedIndexBeforeCopiedRange = (int) ((numSIMDElements * 2) - 1);
+            auto firstUnchangedIndexAfterCopiedRange = (int) ((numSIMDElements * 4) + 1);
+            auto unchangedElement1 = numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange);
+            auto unchangedElement2 = numericData.getSample (1, firstUnchangedIndexAfterCopiedRange);
 
-        block.copyTo (numericData, 1, 2, 2);
+            block.copyTo (numericData, 1, 2, 2);
 
-        expectEquals (numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange), unchangedElement1);
-        expectEquals (numericData.getSample (1, firstUnchangedIndexAfterCopiedRange), unchangedElement2);
-        expect (SampleType (numericData.getSample (0, 2 * (int) numSIMDElements)) == block.getSample (0, 1));
-        expect (SampleType (numericData.getSample (1, 3 * (int) numSIMDElements)) == block.getSample (1, 2));
+            expectEquals (numericData.getSample (0, lastUnchangedIndexBeforeCopiedRange), unchangedElement1);
+            expectEquals (numericData.getSample (1, firstUnchangedIndexAfterCopiedRange), unchangedElement2);
+            expect (SampleType (numericData.getSample (0, 2 * (int) numSIMDElements)) == block.getSample (0, 1));
+            expect (SampleType (numericData.getSample (1, 3 * (int) numSIMDElements)) == block.getSample (1, 2));
 
-        numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 15.1, (NumericType) 0.7);
+            numericData.applyGainRamp (0, numericData.getNumSamples(), (NumericType) 15.1, (NumericType) 0.7);
 
-        auto unchangedSIMDElement1 = block.getSample (0, 1);
-        auto unchangedSIMDElement2 = block.getSample (1, 4);
+            auto unchangedSIMDElement1 = block.getSample (0, 1);
+            auto unchangedSIMDElement2 = block.getSample (1, 4);
 
-        block.copyFrom (numericData, 1, 2, 2);
+            block.copyFrom (numericData, 1, 2, 2);
 
-        expect (block.getSample (0, 1) == unchangedSIMDElement1);
-        expect (block.getSample (1, 4) == unchangedSIMDElement2);
-        expectEquals (block.getSample (0, 2).get (0), numericData.getSample (0, (int) numSIMDElements));
-        expectEquals (block.getSample (1, 3).get (0), numericData.getSample (1, (int) (numSIMDElements * 2)));
+            expect (block.getSample (0, 1) == unchangedSIMDElement1);
+            expect (block.getSample (1, 4) == unchangedSIMDElement2);
+            expectEquals (block.getSample (0, 2).get (0), numericData.getSample (0, (int) numSIMDElements));
+            expectEquals (block.getSample (1, 3).get (0), numericData.getSample (1, (int) (numSIMDElements * 2)));
 
-        if (numSIMDElements > 1)
-        {
-            expectEquals (block.getSample (0, 2).get (1), numericData.getSample (0, (int) (numSIMDElements + 1)));
-            expectEquals (block.getSample (1, 3).get (1), numericData.getSample (1, (int) ((numSIMDElements * 2) + 1)));
+            if (numSIMDElements > 1)
+            {
+                expectEquals (block.getSample (0, 2).get (1), numericData.getSample (0, (int) (numSIMDElements + 1)));
+                expectEquals (block.getSample (1, 3).get (1), numericData.getSample (1, (int) ((numSIMDElements * 2) + 1)));
+            }
         }
+       #endif
     }
-   #endif
 
     //==============================================================================
-    template <typename T = SampleType>
-    ScalarVoid<T> smoothedValueTests()
+    void smoothedValueTests()
     {
-        block.fill ((SampleType) 1.0);
-        SmoothedValue<SampleType> sv { (SampleType) 1.0 };
-        sv.reset (1, 4);
-        sv.setTargetValue ((SampleType) 0.0);
-
-        block.multiplyBy (sv);
-        expect (block.getSample (0, 2) < (SampleType) 1.0);
-        expect (block.getSample (1, 2) < (SampleType) 1.0);
-        expect (block.getSample (0, 2) > (SampleType) 0.0);
-        expect (block.getSample (1, 2) > (SampleType) 0.0);
-        expectEquals (block.getSample (0, 5), (SampleType) 0.0);
-        expectEquals (block.getSample (1, 5), (SampleType) 0.0);
-
-        sv.setCurrentAndTargetValue (-1.0f);
-        sv.setTargetValue (0.0f);
-        otherBlock.fill (-1.0f);
-        block.replaceWithProductOf (otherBlock, sv);
-        expect (block.getSample (0, 2) < (SampleType) 1.0);
-        expect (block.getSample (1, 2) < (SampleType) 1.0);
-        expect (block.getSample (0, 2) > (SampleType) 0.0);
-        expect (block.getSample (1, 2) > (SampleType) 0.0);
-        expectEquals (block.getSample (0, 5), (SampleType) 0.0);
-        expectEquals (block.getSample (1, 5), (SampleType) 0.0);
+        if constexpr (std::is_scalar_v<SampleType>)
+        {
+            block.fill ((SampleType) 1.0);
+            SmoothedValue<SampleType> sv { (SampleType) 1.0 };
+            sv.reset (1, 4);
+            sv.setTargetValue ((SampleType) 0.0);
+
+            block.multiplyBy (sv);
+            expect (block.getSample (0, 2) < (SampleType) 1.0);
+            expect (block.getSample (1, 2) < (SampleType) 1.0);
+            expect (block.getSample (0, 2) > (SampleType) 0.0);
+            expect (block.getSample (1, 2) > (SampleType) 0.0);
+            expectEquals (block.getSample (0, 5), (SampleType) 0.0);
+            expectEquals (block.getSample (1, 5), (SampleType) 0.0);
+
+            sv.setCurrentAndTargetValue (-1.0f);
+            sv.setTargetValue (0.0f);
+            otherBlock.fill (-1.0f);
+            block.replaceWithProductOf (otherBlock, sv);
+            expect (block.getSample (0, 2) < (SampleType) 1.0);
+            expect (block.getSample (1, 2) < (SampleType) 1.0);
+            expect (block.getSample (0, 2) > (SampleType) 0.0);
+            expect (block.getSample (1, 2) > (SampleType) 0.0);
+            expectEquals (block.getSample (0, 5), (SampleType) 0.0);
+            expectEquals (block.getSample (1, 5), (SampleType) 0.0);
+        }
     }
 
-    template <typename T = SampleType>
-    SIMDVoid<T> smoothedValueTests() {}
-
     //==============================================================================
     void resetBlocks()
     {
@@ -451,7 +443,7 @@ private:
     //==============================================================================
     static SampleType* allocateAlignedMemory (int numSamplesToAllocate)
     {
-        auto alignmentLowerBound = std::alignment_of<SampleType>::value;
+        auto alignmentLowerBound = std::alignment_of_v<SampleType>;
        #if ! JUCE_WINDOWS
         alignmentLowerBound = jmax (sizeof (void*), alignmentLowerBound);
        #endif

modules/juce_dsp/containers/juce_FixedSizeFunction.h

@@ -56,13 +56,13 @@ namespace detail
     }
 
     template <typename Fn, typename Ret, typename... Args>
-    typename std::enable_if<std::is_same<Ret, void>::value, Ret>::type call (void* s, Args... args)
+    std::enable_if_t<std::is_same_v<Ret, void>, Ret> call (void* s, Args... args)
     {
         (*reinterpret_cast<Fn*> (s)) (args...);
     }
 
     template <typename Fn, typename Ret, typename... Args>
-    typename std::enable_if<! std::is_same<Ret, void>::value, Ret>::type call (void* s, Args... args)
+    std::enable_if_t<! std::is_same_v<Ret, void>, Ret> call (void* s, Args... args)
     {
         return (*reinterpret_cast<Fn*> (s)) (std::forward<Args> (args)...);
     }
@@ -102,16 +102,16 @@ template <size_t len, typename Ret, typename... Args>
 class FixedSizeFunction<len, Ret (Args...)>
 {
 private:
-    using Storage = typename std::aligned_storage<len>::type;
+    using Storage = std::aligned_storage_t<len>;
 
     template <typename Item>
-    using Decay = typename std::decay<Item>::type;
+    using Decay = std::decay_t<Item>;
 
     template <typename Item, typename Fn = Decay<Item>>
-    using IntIfValidConversion = typename std::enable_if<sizeof (Fn) <= len
-                                                             && alignof (Fn) <= alignof (Storage)
-                                                             && ! std::is_same<FixedSizeFunction, Fn>::value,
-                                                         int>::type;
+    using IntIfValidConversion = std::enable_if_t<sizeof (Fn) <= len
+                                                      && alignof (Fn) <= alignof (Storage)
+                                                      && ! std::is_same_v<FixedSizeFunction, Fn>,
+                                                  int>;
 
 public:
     /** Create an empty function. */
@@ -149,7 +149,7 @@ public:
     }
 
     /** Converting constructor from smaller FixedSizeFunctions. */
-    template <size_t otherLen, typename std::enable_if<(otherLen < len), int>::type = 0>
+    template <size_t otherLen, std::enable_if_t<(otherLen < len), int> = 0>
     FixedSizeFunction (FixedSizeFunction<otherLen, Ret (Args...)>&& other) noexcept
         : vtable (other.vtable)
     {
@@ -172,7 +172,7 @@ public:
     }
 
     /** Move assignment from smaller FixedSizeFunctions. */
-    template <size_t otherLen, typename std::enable_if<(otherLen < len), int>::type = 0>
+    template <size_t otherLen, std::enable_if_t<(otherLen < len), int> = 0>
     FixedSizeFunction& operator= (FixedSizeFunction<otherLen, Ret (Args...)>&& other) noexcept
     {
         return *this = FixedSizeFunction (std::move (other));

modules/juce_dsp/containers/juce_SIMDRegister.h

@@ -70,7 +70,7 @@ struct SIMDRegister
 
     /** The corresponding primitive integer type, for example, this will be int32_t
         if type is a float. */
-    using MaskType = typename SIMDInternal::MaskTypeFor<ElementType>::type;
+    using MaskType = SIMDInternal::MaskType<ElementType>;
 
     //==============================================================================
     // Here are some types which are needed internally

modules/juce_dsp/containers/juce_SIMDRegister_test.cpp

@@ -30,33 +30,32 @@ namespace dsp
 
 namespace SIMDRegister_test_internal
 {
-    template <typename type, typename = void> struct RandomPrimitive {};
-
     template <typename type>
-    struct RandomPrimitive<type, typename std::enable_if<std::is_floating_point<type>::value>::type>
+    struct RandomPrimitive
     {
         static type next (Random& random)
         {
-            return static_cast<type> (std::is_signed<type>::value ? (random.nextFloat() * 16.0) - 8.0
-                                                                  : (random.nextFloat() * 8.0));
+            if constexpr (std::is_floating_point_v<type>)
+            {
+                return static_cast<type> (std::is_signed_v<type> ? (random.nextFloat() * 16.0) - 8.0
+                                                                 : (random.nextFloat() * 8.0));
+            }
+            else if constexpr (std::is_integral_v<type>)
+            {
+                return static_cast<type> (random.nextInt64());
+            }
         }
     };
 
     template <typename type>
-    struct RandomPrimitive<type, typename std::enable_if<std::is_integral<type>::value>::type>
+    struct RandomValue
     {
         static type next (Random& random)
         {
-            return static_cast<type> (random.nextInt64());
+            return RandomPrimitive<type>::next (random);
         }
     };
 
-    template <typename type>
-    struct RandomValue
-    {
-        static type next (Random& random) { return RandomPrimitive<type>::next (random); }
-    };
-
     template <typename type>
     struct RandomValue<std::complex<type>>
     {
@@ -756,11 +755,10 @@ public:
         template <typename type>
         static void run (UnitTest& u, Random& random, Tag<type>)
         {
-            bool is_signed = std::is_signed<type>::value;
             type array [SIMDRegister<type>::SIMDNumElements];
 
-            auto value = is_signed ? static_cast<type> ((random.nextFloat() * 16.0) - 8.0)
-                                   : static_cast<type> (random.nextFloat() * 8.0);
+            auto value = std::is_signed_v<type> ? static_cast<type> ((random.nextFloat() * 16.0) - 8.0)
+                                                : static_cast<type> (random.nextFloat() * 8.0);
 
             std::fill (array, array + SIMDRegister<type>::SIMDNumElements, value);
             SIMDRegister<type> a, b;

modules/juce_dsp/frequency/juce_Convolution.h

@@ -184,7 +184,7 @@ public:
         stereo processing.
     */
     template <typename ProcessContext,
-              std::enable_if_t<std::is_same<typename ProcessContext::SampleType, float>::value, int> = 0>
+              std::enable_if_t<std::is_same_v<typename ProcessContext::SampleType, float>, int> = 0>
     void process (const ProcessContext& context) noexcept
     {
         processSamples (context.getInputBlock(), context.getOutputBlock(), context.isBypassed);

modules/juce_dsp/native/juce_fallback_SIMDNativeOps.h

@@ -42,8 +42,10 @@ namespace SIMDInternal
     template <> struct MaskTypeFor <std::complex<float>>    { using type = uint32_t; };
     template <> struct MaskTypeFor <std::complex<double>>   { using type = uint64_t; };
 
-    template <typename Primitive> struct PrimitiveType                           { using type = typename std::remove_cv<Primitive>::type; };
-    template <typename Primitive> struct PrimitiveType<std::complex<Primitive>>  { using type = typename std::remove_cv<Primitive>::type; };
+    template <typename Primitive> using MaskType = typename MaskTypeFor<Primitive>::type;
+
+    template <typename Primitive> struct PrimitiveType                           { using type = std::remove_cv_t<Primitive>; };
+    template <typename Primitive> struct PrimitiveType<std::complex<Primitive>>  { using type = std::remove_cv_t<Primitive>; };
 
     template <int n>    struct Log2Helper    { enum { value = Log2Helper<n/2>::value + 1 }; };
     template <>         struct Log2Helper<1> { enum { value = 0 }; };
@@ -63,7 +65,7 @@ struct SIMDFallbackOps
     static constexpr size_t bits = SIMDInternal::Log2Helper<(int) n>::value;
 
     // helper types
-    using MaskType = typename SIMDInternal::MaskTypeFor<ScalarType>::type;
+    using MaskType = SIMDInternal::MaskType<ScalarType>;
     union UnionType     { vSIMDType v; ScalarType s[n]; };
     union UnionMaskType { vSIMDType v; MaskType   m[n]; };
 

modules/juce_dsp/processors/juce_DelayLine.h

@@ -201,126 +201,104 @@ public:
 
 private:
     //==============================================================================
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::None>::value, SampleType>::type
-    interpolateSample (int channel) const
+    SampleType interpolateSample (int channel)
     {
-        auto index = (readPos[(size_t) channel] + delayInt) % totalSize;
-        return bufferData.getSample (channel, index);
-    }
-
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Linear>::value, SampleType>::type
-    interpolateSample (int channel) const
-    {
-        auto index1 = readPos[(size_t) channel] + delayInt;
-        auto index2 = index1 + 1;
-
-        if (index2 >= totalSize)
+        if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::None>)
         {
-            index1 %= totalSize;
-            index2 %= totalSize;
+            auto index = (readPos[(size_t) channel] + delayInt) % totalSize;
+            return bufferData.getSample (channel, index);
         }
+        else if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Linear>)
+        {
+            auto index1 = readPos[(size_t) channel] + delayInt;
+            auto index2 = index1 + 1;
 
-        auto value1 = bufferData.getSample (channel, index1);
-        auto value2 = bufferData.getSample (channel, index2);
-
-        return value1 + delayFrac * (value2 - value1);
-    }
+            if (index2 >= totalSize)
+            {
+                index1 %= totalSize;
+                index2 %= totalSize;
+            }
 
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Lagrange3rd>::value, SampleType>::type
-    interpolateSample (int channel) const
-    {
-        auto index1 = readPos[(size_t) channel] + delayInt;
-        auto index2 = index1 + 1;
-        auto index3 = index2 + 1;
-        auto index4 = index3 + 1;
+            auto value1 = bufferData.getSample (channel, index1);
+            auto value2 = bufferData.getSample (channel, index2);
 
-        if (index4 >= totalSize)
-        {
-            index1 %= totalSize;
-            index2 %= totalSize;
-            index3 %= totalSize;
-            index4 %= totalSize;
+            return value1 + delayFrac * (value2 - value1);
         }
+        else if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Lagrange3rd>)
+        {
+            auto index1 = readPos[(size_t) channel] + delayInt;
+            auto index2 = index1 + 1;
+            auto index3 = index2 + 1;
+            auto index4 = index3 + 1;
 
-        auto* samples = bufferData.getReadPointer (channel);
+            if (index4 >= totalSize)
+            {
+                index1 %= totalSize;
+                index2 %= totalSize;
+                index3 %= totalSize;
+                index4 %= totalSize;
+            }
 
-        auto value1 = samples[index1];
-        auto value2 = samples[index2];
-        auto value3 = samples[index3];
-        auto value4 = samples[index4];
+            auto* samples = bufferData.getReadPointer (channel);
 
-        auto d1 = delayFrac - 1.f;
-        auto d2 = delayFrac - 2.f;
-        auto d3 = delayFrac - 3.f;
+            auto value1 = samples[index1];
+            auto value2 = samples[index2];
+            auto value3 = samples[index3];
+            auto value4 = samples[index4];
 
-        auto c1 = -d1 * d2 * d3 / 6.f;
-        auto c2 = d2 * d3 * 0.5f;
-        auto c3 = -d1 * d3 * 0.5f;
-        auto c4 = d1 * d2 / 6.f;
+            auto d1 = delayFrac - 1.f;
+            auto d2 = delayFrac - 2.f;
+            auto d3 = delayFrac - 3.f;
 
-        return value1 * c1 + delayFrac * (value2 * c2 + value3 * c3 + value4 * c4);
-    }
+            auto c1 = -d1 * d2 * d3 / 6.f;
+            auto c2 = d2 * d3 * 0.5f;
+            auto c3 = -d1 * d3 * 0.5f;
+            auto c4 = d1 * d2 / 6.f;
 
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Thiran>::value, SampleType>::type
-    interpolateSample (int channel)
-    {
-        auto index1 = readPos[(size_t) channel] + delayInt;
-        auto index2 = index1 + 1;
-
-        if (index2 >= totalSize)
-        {
-            index1 %= totalSize;
-            index2 %= totalSize;
+            return value1 * c1 + delayFrac * (value2 * c2 + value3 * c3 + value4 * c4);
         }
+        else if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Thiran>)
+        {
+            auto index1 = readPos[(size_t) channel] + delayInt;
+            auto index2 = index1 + 1;
 
-        auto value1 = bufferData.getSample (channel, index1);
-        auto value2 = bufferData.getSample (channel, index2);
-
-        auto output = delayFrac == 0 ? value1 : value2 + alpha * (value1 - v[(size_t) channel]);
-        v[(size_t) channel] = output;
-
-        return output;
-    }
+            if (index2 >= totalSize)
+            {
+                index1 %= totalSize;
+                index2 %= totalSize;
+            }
 
-    //==============================================================================
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::None>::value, void>::type
-    updateInternalVariables()
-    {
-    }
+            auto value1 = bufferData.getSample (channel, index1);
+            auto value2 = bufferData.getSample (channel, index2);
 
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Linear>::value, void>::type
-    updateInternalVariables()
-    {
-    }
+            auto output = delayFrac == 0 ? value1 : value2 + alpha * (value1 - v[(size_t) channel]);
+            v[(size_t) channel] = output;
 
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Lagrange3rd>::value, void>::type
-    updateInternalVariables()
-    {
-        if (delayInt >= 1)
-        {
-            delayFrac++;
-            delayInt--;
+            return output;
         }
     }
 
-    template <typename T = InterpolationType>
-    typename std::enable_if <std::is_same <T, DelayLineInterpolationTypes::Thiran>::value, void>::type
-    updateInternalVariables()
+    //==============================================================================
+    void updateInternalVariables()
     {
-        if (delayFrac < (SampleType) 0.618 && delayInt >= 1)
+        if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Lagrange3rd>)
         {
-            delayFrac++;
-            delayInt--;
+            if (delayInt >= 1)
+            {
+                delayFrac++;
+                delayInt--;
+            }
         }
+        else if constexpr (std::is_same_v<InterpolationType, DelayLineInterpolationTypes::Thiran>)
+        {
+            if (delayFrac < (SampleType) 0.618 && delayInt >= 1)
+            {
+                delayFrac++;
+                delayInt--;
+            }
 
-        alpha = (1 - delayFrac) / (1 + delayFrac);
+            alpha = (1 - delayFrac) / (1 + delayFrac);
+        }
     }
 
     //==============================================================================

modules/juce_dsp/processors/juce_FIRFilter.h

@@ -122,7 +122,7 @@ namespace FIR
         template <typename ProcessContext>
         void process (const ProcessContext& context) noexcept
         {
-            static_assert (std::is_same<typename ProcessContext::SampleType, SampleType>::value,
+            static_assert (std::is_same_v<typename ProcessContext::SampleType, SampleType>,
                            "The sample-type of the FIR filter must match the sample-type supplied to this process callback");
             check();
 

modules/juce_dsp/processors/juce_IIRFilter_Impl.h

@@ -89,7 +89,7 @@ template <typename SampleType>
 template <typename ProcessContext, bool bypassed>
 void Filter<SampleType>::processInternal (const ProcessContext& context) noexcept
 {
-    static_assert (std::is_same<typename ProcessContext::SampleType, SampleType>::value,
+    static_assert (std::is_same_v<typename ProcessContext::SampleType, SampleType>,
                    "The sample-type of the IIR filter must match the sample-type supplied to this process callback");
     check();
 

modules/juce_dsp/processors/juce_ProcessorChain.h

@@ -42,7 +42,7 @@ namespace detail
     }
 
     template <typename T>
-    using TupleIndexSequence = std::make_index_sequence<std::tuple_size<std::remove_cv_t<std::remove_reference_t<T>>>::value>;
+    using TupleIndexSequence = std::make_index_sequence<std::tuple_size_v<std::remove_cv_t<std::remove_reference_t<T>>>>;
 
     template <typename Fn, typename Tuple>
     constexpr void forEachInTuple (Fn&& fn, Tuple&& tuple)
@@ -99,23 +99,24 @@ public:
     }
 
 private:
-    template <typename Context, typename Proc, size_t Ix, std::enable_if_t<! detail::useContextDirectly<Context, Ix>, int> = 0>
+    template <typename Context, typename Proc, size_t Ix>
     void processOne (const Context& context, Proc& proc, std::integral_constant<size_t, Ix>) noexcept
     {
-        jassert (context.getOutputBlock().getNumChannels() == context.getInputBlock().getNumChannels());
-        ProcessContextReplacing<typename Context::SampleType> replacingContext (context.getOutputBlock());
-        replacingContext.isBypassed = (bypassed[Ix] || context.isBypassed);
-
-        proc.process (replacingContext);
-    }
-
-    template <typename Context, typename Proc, size_t Ix, std::enable_if_t<detail::useContextDirectly<Context, Ix>, int> = 0>
-    void processOne (const Context& context, Proc& proc, std::integral_constant<size_t, Ix>) noexcept
-    {
-        auto contextCopy = context;
-        contextCopy.isBypassed = (bypassed[Ix] || context.isBypassed);
-
-        proc.process (contextCopy);
+        if constexpr (detail::useContextDirectly<Context, Ix>)
+        {
+            auto contextCopy = context;
+            contextCopy.isBypassed = (bypassed[Ix] || context.isBypassed);
+
+            proc.process (contextCopy);
+        }
+        else
+        {
+            jassert (context.getOutputBlock().getNumChannels() == context.getInputBlock().getNumChannels());
+            ProcessContextReplacing<typename Context::SampleType> replacingContext (context.getOutputBlock());
+            replacingContext.isBypassed = (bypassed[Ix] || context.isBypassed);
+
+            proc.process (replacingContext);
+        }
     }
 
     std::tuple<Processors...> processors;

modules/juce_dsp/processors/juce_StateVariableFilter.h

@@ -110,7 +110,7 @@ namespace StateVariableFilter
         template <typename ProcessContext>
         void process (const ProcessContext& context) noexcept
         {
-            static_assert (std::is_same<typename ProcessContext::SampleType, SampleType>::value,
+            static_assert (std::is_same_v<typename ProcessContext::SampleType, SampleType>,
                            "The sample-type of the filter must match the sample-type supplied to this process callback");
 
             if (context.isBypassed)

modules/juce_graphics/fonts/juce_TextLayout.h

@@ -44,7 +44,7 @@ private:
     class DereferencingIterator
     {
     public:
-        using value_type = typename std::remove_reference<decltype(**std::declval<Iterator>())>::type;
+        using value_type = std::remove_reference_t<decltype(**std::declval<Iterator>())>;
         using difference_type = typename std::iterator_traits<Iterator>::difference_type;
         using pointer = value_type*;
         using reference = value_type&;

modules/juce_graphics/geometry/juce_Point.h

@@ -123,7 +123,7 @@ public:
     template <typename OtherType>
     constexpr Point operator* (OtherType multiplier) const noexcept
     {
-        using CommonType = typename std::common_type<ValueType, OtherType>::type;
+        using CommonType = std::common_type_t<ValueType, OtherType>;
         return Point ((ValueType) ((CommonType) x * (CommonType) multiplier),
                       (ValueType) ((CommonType) y * (CommonType) multiplier));
     }
@@ -132,7 +132,7 @@ public:
     template <typename OtherType>
     constexpr Point operator/ (OtherType divisor) const noexcept
     {
-        using CommonType = typename std::common_type<ValueType, OtherType>::type;
+        using CommonType = std::common_type_t<ValueType, OtherType>;
         return Point ((ValueType) ((CommonType) x / (CommonType) divisor),
                       (ValueType) ((CommonType) y / (CommonType) divisor));
     }
@@ -150,7 +150,7 @@ public:
 
     //==============================================================================
     /** This type will be double if the Point's type is double, otherwise it will be float. */
-    using FloatType = typename TypeHelpers::SmallestFloatType<ValueType>::type;
+    using FloatType = TypeHelpers::SmallestFloatType<ValueType>;
 
     //==============================================================================
     /** Returns the straight-line distance between this point and the origin. */

modules/juce_graphics/geometry/juce_Rectangle.h

@@ -813,7 +813,7 @@ public:
     */
     Rectangle transformedBy (const AffineTransform& transform) const noexcept
     {
-        using FloatType = typename TypeHelpers::SmallestFloatType<ValueType>::type;
+        using FloatType = TypeHelpers::SmallestFloatType<ValueType>;
 
         auto x1 = static_cast<FloatType> (pos.x),     y1 = static_cast<FloatType> (pos.y);
         auto x2 = static_cast<FloatType> (pos.x + w), y2 = static_cast<FloatType> (pos.y);

modules/juce_gui_basics/native/juce_win32_Windowing.cpp

@@ -2811,7 +2811,7 @@ private:
                 CombineRgn (rgn, rgn, clipRgn, RGN_AND);
                 DeleteObject (clipRgn);
 
-                std::aligned_storage<8192, alignof (RGNDATA)>::type rgnData;
+                std::aligned_storage_t<8192, alignof (RGNDATA)> rgnData;
                 const DWORD res = GetRegionData (rgn, sizeof (rgnData), (RGNDATA*) &rgnData);
 
                 if (res > 0 && res <= sizeof (rgnData))