MSVC 2022 compilation error in capsaicin_internal_negotiate.cpp with nested lambda template parameters #36
Description
Description
The latest code (commit 49304bdfd) fails to compile with MSVC 2022 due to template parameter scoping issues in nested lambda functions in src/core/src/capsaicin/capsaicin_internal_negotiate.cpp
Error Details
The compiler cannot resolve the template parameter SharedT from the outer lambda handleShared when used in constexpr contexts within nested lambdas like ypeStringMap, combineSharedsFunc, etc.\n\nKey error:\n`\nC:\Users\hisha\Documents\github.com\RadeonPro\Capsaicin\src\core\src\capsaicin\capsaicin_internal_negotiate.cpp(518,27): error C2923: 'std::is_same_v': 'SharedT' is not a valid template type argument for parameter '
The pattern if constexpr (is_same_v<SharedT, SharedTexture>) appears in nested lambdas and MSVC cannot properly capture/resolve the template parameter in these contexts.
Command-Line Reproduction
git clone https://github.com/GPUOpen-LibrariesAndSDKs/Capsaicin.git
cd Capsaicin
git checkout 49304bdfd
cmake -B build
cmake --build build --config Release
Expected Result
Build should complete successfully
Actual Result
Build fails with compilation errors:\n`\nC:\Users\hisha\Documents\github.com\RadeonPro\Capsaicin\src\core\src\capsaicin\capsaicin_internal_negotiate.cpp(518,27): error C2923: 'std::is_same_v': 'SharedT' is not a valid template type argument for parameter ''\nC:\Users\hisha\Documents\github.com\RadeonPro\Capsaicin\src\core\src\capsaicin\capsaicin_internal_negotiate.cpp(518,60): error C2059: syntax error: ')'\nC:\Users\hisha\Documents\github.com\RadeonPro\Capsaicin\src\core\src\capsaicin\capsaicin_internal_negotiate.cpp(519,13): error C2143: syntax error: missing ';' before '{'\n... (100+ errors cascade from the initial template parameter resolution failure)
Environment
OS: Windows 11\n- Compiler: MSVC 17.14.40 (.NET Framework) \n- Visual Studio: 2022 Professional\n- CMake: Used via Visual Studio's CMake integration\n- Commit: 49304bdfd ('Capsaicin: Add todo for shared texture scale.')\n- Build Configuration: Release x64\n\n## Additional Context\n\nAll third-party dependencies (gfx, ktx, rtxdi, yaml-cpp, meshoptimizer, etc.) compile successfully. Only the core Capsaicin library (capsaicin.vcxproj) fails during compilation.\n\nThe issue affects multiple nested lambdas in the
egotiateRenderTechniques() function, specifically within the handleShared lambda template where inner lambdas try to use the outer template parameter SharedT in compile-time type checking.\n\n### Affected Code Location\n\nFile: src/core/src/capsaicin/capsaicin_internal_negotiate.cpp\n\nStarting around line 500, the handleShared generic lambda template contains several nested lambdas:\n- ypeStringMap (line ~518)\n- combineSharedsFunc (line ~520)\n- �ddSharedFunc (line ~640)\n- sharedFunc (line ~660)\n\nAll of these attempt to use if constexpr (is_same_v<SharedT, SharedTexture>) or if constexpr (is_same_v<SharedT, SharedBuffer>) which MSVC cannot resolve.\n\n## Suggested Fix\n\nThe nested lambda structure may need to be refactored to avoid template parameter scoping issues with MSVC, possibly by:\n- Moving the inner lambdas outside and passing SharedT as a template parameter\n- Using a different approach that doesn't rely on nested constexpr template checks\n- Explicitly capturing template parameters in a way MSVC can resolve\n- Converting some lambdas to regular template functions outside the parent lambda