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Add FMT_STATIC_CONSTEXPR

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Victor Zverovich
2021-06-04 16:20:46 -07:00
parent 986a5a6c2c
commit cfde93afe0
1 changed files with 8 additions and 1 deletions
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9
include/fmt/format.h
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@ -254,6 +254,13 @@ namespace detail {
# define FMT_CONSTEXPR20 # define FMT_CONSTEXPR20
#endif #endif
// Workaround poor codegen in MSVC.
#if FMT_MSC_VER
# define FMT_STATIC_CONSTEXPR static constexpr
#else
# define FMT_STATIC_CONSTEXPR constexpr
#endif
// An equivalent of `*reinterpret_cast<Dest*>(&source)` that doesn't have // An equivalent of `*reinterpret_cast<Dest*>(&source)` that doesn't have
// undefined behavior (e.g. due to type aliasing). // undefined behavior (e.g. due to type aliasing).
// Example: uint64_t d = bit_cast<uint64_t>(2.718); // Example: uint64_t d = bit_cast<uint64_t>(2.718);
@ -1001,7 +1008,7 @@ FMT_CONSTEXPR20 inline auto count_digits(uint32_t n) -> int {
// An optimization by Kendall Willets from https://bit.ly/3uOIQrB. // An optimization by Kendall Willets from https://bit.ly/3uOIQrB.
// This increments the upper 32 bits (log10(T) - 1) when >= T is added. // This increments the upper 32 bits (log10(T) - 1) when >= T is added.
# define FMT_INC(T) (((sizeof(# T) - 1ull) << 32) - T) # define FMT_INC(T) (((sizeof(# T) - 1ull) << 32) - T)
constexpr uint64_t table[] = { FMT_STATIC_CONSTEXPR uint64_t table[] = {
FMT_INC(0), FMT_INC(0), FMT_INC(0), // 8 FMT_INC(0), FMT_INC(0), FMT_INC(0), // 8
FMT_INC(10), FMT_INC(10), FMT_INC(10), // 64 FMT_INC(10), FMT_INC(10), FMT_INC(10), // 64
FMT_INC(100), FMT_INC(100), FMT_INC(100), // 512 FMT_INC(100), FMT_INC(100), FMT_INC(100), // 512