Added a constructor to StringRef that takes a std::string

modules/juce_core/text/juce_String.cpp

@@ -2207,7 +2207,8 @@ StringRef::StringRef (String::CharPointerType stringLiteral) noexcept  : text (s
     jassert (stringLiteral.getAddress() != nullptr); // This must be a valid string literal, not a null pointer!!
 }
 
-StringRef::StringRef (const String& string) noexcept  : text (string.getCharPointer()) {}
+StringRef::StringRef (const String& string) noexcept   : text (string.getCharPointer()) {}
+StringRef::StringRef (const std::string& string)       : StringRef (string.c_str()) {}
 
 
 //==============================================================================

modules/juce_core/text/juce_StringRef.h

@@ -81,6 +81,13 @@ public:
     */
     StringRef (const String& string) noexcept;
 
+    /** Creates a StringRef from a String.
+        The StringRef object does NOT take ownership or copy the data from the std::string,
+        so you must ensure that the source string object is not modified or deleted during
+        the lifetime of the StringRef.
+    */
+    StringRef (const std::string& string);
+
     /** Creates a StringRef pointer to an empty string. */
     StringRef() noexcept;