platform.h

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#pragma once
 
#include <type_traits>
 
#if defined(__cpp_lib_is_constant_evaluated) && __cpp_lib_is_constant_evaluated >= 201811L
#   define BS_CONST_EVALUATED() (std::is_constant_evaluated())
#   define BS_CONSTEXPR constexpr
#else // __cpp_lib_is_constant_evaluated
#   define BS_CONST_EVALUATED() constexpr (false)
#   define BS_CONSTEXPR
#endif // __cpp_lib_is_constant_evaluated