MRMacros.h

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#pragma once
 
// Those are generic helper macros that don't have their own headers.
 
// Convert to a string.
#define MR_STR(...) MR_STR_(__VA_ARGS__)
#define MR_STR_(...) #__VA_ARGS__
 
// Returns the argument unchanged.
#define MR_IDENTITY(...) __VA_ARGS__
 
// A helper for writing preprocessor loops.
#define MR_END(...) DETAIL_MR_END(__VA_ARGS__)
#define DETAIL_MR_END(...) __VA_ARGS__##_END
 
 
// If the compiler supports `requires`, expands to `requires(...)`. Otherwise to nothing.
// This is primarily useful for code that must be usable in Cuda, since everywhere else we're free to use C++20 and newer.
// While Clang 14 technically supports `requires`, we're getting a few weird issues with it (make a nested aggregate class,
//   in the enclosing class make a `MR::Vector` of it, observe that `std::default_initializable` gets baked as `false` on it,
//   disabling some member functions such as `.resize()`).
#if __cpp_concepts && __has_include(<concepts>) && !(defined(__clang__) && __clang_major__ <= 14) && !(defined(__GNUC__) && !defined(__clang__) && __GNUC__ <= 12)
#   define MR_REQUIRES_IF_SUPPORTED(...) requires(__VA_ARGS__)
#   define MR_HAS_REQUIRES 1
#else
#   define MR_REQUIRES_IF_SUPPORTED(...)
#   define MR_HAS_REQUIRES 0
#endif