Translate C# Singletons library to C++

[konard]

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This pull request successfully translates the C# Platform.Singletons library to C++.

📋 Issue Reference

Fixes #23

✅ Implementation Complete

Core Components Translated:

1. Global.h/.cpp - Static global class with Trash property for performance testing

   • Translated C# auto-property to getter/setter methods and reference accessor
   • Added static member variable definition in .cpp file

2. Default[T].h - Template class providing default instances

   • Instance: Static const member providing default-constructed objects
   • GetThreadInstance(): Thread-local storage for per-thread instances
   • Uses static_assert for default constructibility constraint

3. SingletonFactory (Singleton.h) - Factory class for creating singletons

   • Create(): Template method to create Singleton instances
   • Get(): Template method for direct singleton access

4. Singleton[T].h - Template struct for function-based singleton management

   • Thread-safe singleton creation using std::mutex
   • Function object address used as unique identifier
   • Maintains singleton instances in static std::unordered_map

Testing & Build System:

• Test Translation: All C# xUnit tests converted to C++ assert-based tests
• CMakeLists.txt: Complete build configuration for library and tests
• Test Runner: Simple console application running all tests
• ✅ All tests pass successfully

Key Technical Differences from C#:

C# Feature	C++ Translation
ConcurrentDictionary	std::unordered_map + std::mutex
[ThreadStatic]	thread_local
Auto-properties	Getter/setter methods + reference accessor
Reflection/IL bytes	Function object address for uniqueness
new() constraint	std::is_default_constructible_v<T> constraint

Limitations:

The C++ version has one known limitation compared to the C# version:

• Different lambda functions with identical content will be treated as separate singletons (different addresses)
• C# version uses IL byte comparison for true semantic equality
• This is a fundamental difference in how C++ vs C# handle function equality

Build & Test:

cd cpp
mkdir build && cd build
cmake .. && make
./Platform.Singletons.Tests

🏁 Status

Ready for Review - Complete translation with passing tests and full CMake build system.

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