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use static_assert in COMPILE_TIME_ASSERT if compiler reports capability through __has_feature

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Maksim Smolin
2019-01-22 17:20:28 -08:00
parent dba6cca973
commit 1dccbadb93
1 changed files with 9 additions and 1 deletions
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10
public/tier0/dbg.h
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@ -566,7 +566,15 @@ public:
// We're using an ancient version of GCC that can't quite handle some
// of our complicated templates properly. Use some preprocessor trickery
// to workaround this
#ifdef __GNUC__
#ifndef __has_feature
#define __has_feature(x) 0 // Compatibility with non-clang compilers.
#endif
#if __has_feature(cxx_static_assert)
// If available use static_assert instead of weird language tricks. This
// leads to much more readable messages when compile time assert constraints
// are violated.
#define COMPILE_TIME_ASSERT( pred ) static_assert( pred, "Compile time assert constraint is not true: " #pred )
#elif defined __GNUC__
#define COMPILE_TIME_ASSERT( pred ) typedef int UNIQUE_ID[ (pred) ? 1 : -1 ] __attribute__((unused))
#else
#if _MSC_VER >= 1600