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Make MSVC use [[nodiscard]] (#2615)

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* Make MSVC use [[nodiscard]]
* Uniformly detect attributes for __cplusplus and _MSVC_LANG
This commit is contained in:
Alex Guteniev 2021-11-26 17:32:50 +02:00 committed by GitHub
parent acad8cfab1
commit 201971e293
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1 changed files with 9 additions and 4 deletions
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13
include/fmt/core.h
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@ -82,11 +82,17 @@
# define FMT_HAS_CPP_ATTRIBUTE(x) 0
#endif
#ifdef _MSVC_LANG
# define FMT_CPLUSPLUS _MSVC_LANG
#else
# define FMT_CPLUSPLUS __cplusplus
#endif
#define FMT_HAS_CPP14_ATTRIBUTE(attribute) \
(__cplusplus >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute))
(FMT_CPLUSPLUS >= 201402L && FMT_HAS_CPP_ATTRIBUTE(attribute))
#define FMT_HAS_CPP17_ATTRIBUTE(attribute) \
(__cplusplus >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute))
(FMT_CPLUSPLUS >= 201703L && FMT_HAS_CPP_ATTRIBUTE(attribute))
// Check if relaxed C++14 constexpr is supported.
// GCC doesn't allow throw in constexpr until version 6 (bug 67371).
@ -180,8 +186,7 @@
# else
# define FMT_FALLTHROUGH
# endif
#elif FMT_HAS_CPP17_ATTRIBUTE(fallthrough) || \
(defined(_MSVC_LANG) && _MSVC_LANG >= 201703L)
#elif FMT_HAS_CPP17_ATTRIBUTE(fallthrough)
# define FMT_FALLTHROUGH [[fallthrough]]
#else
# define FMT_FALLTHROUGH