Added some hashing support for the Uuid class

modules/juce_core/containers/juce_HashMap.h

@@ -47,6 +47,8 @@ struct DefaultHashFunctions
     static int generateHash (const var& key, int upperLimit) noexcept       { return generateHash (key.toString(), upperLimit); }
     /** Generates a simple hash from a void ptr. */
     static int generateHash (const void* key, int upperLimit) noexcept      { return generateHash ((pointer_sized_uint) key, upperLimit); }
+    /** Generates a simple hash from a UUID. */
+    static int generateHash (const Uuid& key, int upperLimit) noexcept      { return generateHash (key.hash(), upperLimit); }
 };
 
 

modules/juce_core/juce_core.h

@@ -250,6 +250,7 @@ namespace juce
 #include "text/juce_LocalisedStrings.h"
 #include "text/juce_Base64.h"
 #include "misc/juce_Result.h"
+#include "misc/juce_Uuid.h"
 #include "containers/juce_Variant.h"
 #include "containers/juce_NamedValueSet.h"
 #include "containers/juce_DynamicObject.h"
@@ -280,7 +281,6 @@ namespace juce
 #include "maths/juce_Expression.h"
 #include "maths/juce_Random.h"
 #include "misc/juce_RuntimePermissions.h"
-#include "misc/juce_Uuid.h"
 #include "misc/juce_WindowsRegistry.h"
 #include "threads/juce_ChildProcess.h"
 #include "threads/juce_DynamicLibrary.h"

modules/juce_core/misc/juce_Uuid.cpp

@@ -134,4 +134,24 @@ uint8  Uuid::getClockSeqAndReserved() const noexcept      { return uuid[8]; }
 uint8  Uuid::getClockSeqLow() const noexcept              { return uuid[9]; }
 uint64 Uuid::getNode() const noexcept                     { return (((uint64) ByteOrder::bigEndianShort (uuid + 10)) << 32) + ByteOrder::bigEndianInt (uuid + 12); }
 
+uint64 Uuid::hash() const noexcept
+{
+    uint64 result = 0;
+
+    for (auto n : uuid)
+        result = ((uint64) 101) * result + n;
+
+    return result;
+}
+
 } // namespace juce
+
+#if ! DOXYGEN
+namespace std
+{
+    template <> struct hash<juce::Uuid>
+    {
+        size_t operator() (const juce::Uuid& u) const noexcept   { return (size_t) u.hash(); }
+    };
+}
+#endif

modules/juce_core/misc/juce_Uuid.h

@@ -105,6 +105,9 @@ public:
     /** Returns the node section of the UUID. */
     uint64 getNode() const noexcept;
 
+    /** Returns a hash of the UUID. */
+    uint64 hash() const noexcept;
+
     //==============================================================================
     /** Returns a pointer to the internal binary representation of the ID.