Fix #946: Add standard iterator traits to all CharPointer types for STL algorithm compatibility

modules/juce_core/text/juce_CharPointer_ASCII.h

@@ -51,6 +51,13 @@ class CharPointer_ASCII  final
 public:
     using CharType = char;
 
+    // Standard iterator traits for compatibility with STL algorithms
+    using difference_type   = std::ptrdiff_t;
+    using value_type        = juce_wchar;
+    using pointer           = juce_wchar*;
+    using reference         = juce_wchar;  // Returns by value since operator*() decodes to juce_wchar
+    using iterator_category = std::input_iterator_tag;
+
     explicit CharPointer_ASCII (const CharType* rawPointer) noexcept
         : data (const_cast<CharType*> (rawPointer))
     {

modules/juce_core/text/juce_CharPointer_UTF16.h

@@ -52,6 +52,13 @@ class CharPointer_UTF16  final
     using CharType = int16;
    #endif
 
+    // Standard iterator traits for compatibility with STL algorithms
+    using difference_type   = std::ptrdiff_t;
+    using value_type        = juce_wchar;
+    using pointer           = juce_wchar*;
+    using reference         = juce_wchar;  // Returns by value since this is a proxy iterator
+    using iterator_category = std::input_iterator_tag;
+
     explicit CharPointer_UTF16 (const CharType* rawPointer) noexcept
         : data (const_cast<CharType*> (rawPointer))
     {

modules/juce_core/text/juce_CharPointer_UTF32.h

@@ -48,6 +48,13 @@ class CharPointer_UTF32  final
 public:
     using CharType = juce_wchar;
 
+    // Standard iterator traits for compatibility with STL algorithms
+    using difference_type   = std::ptrdiff_t;
+    using value_type        = juce_wchar;
+    using pointer           = juce_wchar*;
+    using reference         = juce_wchar;  // Returns by value for consistency across CharPointer types
+    using iterator_category = std::input_iterator_tag;
+
     explicit CharPointer_UTF32 (const CharType* rawPointer) noexcept
         : data (const_cast<CharType*> (rawPointer))
     {

modules/juce_core/text/juce_CharPointer_UTF8.h

@@ -48,6 +48,13 @@ class CharPointer_UTF8  final
 public:
     using CharType = char;
 
+    // Standard iterator traits for compatibility with STL algorithms
+    using value_type = juce_wchar;
+    using pointer = juce_wchar*;
+    using reference = juce_wchar;  // Note: returns by value since this is a proxy iterator
+    using iterator_category = std::input_iterator_tag;
+    using difference_type = std::ptrdiff_t;
+
     explicit CharPointer_UTF8 (const CharType* rawPointer) noexcept
         : data (const_cast<CharType*> (rawPointer))
     {