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Add copy2() constexpr

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This commit is contained in:
Roman Koshelev 2021-09-12 18:07:16 +03:00
parent 4d1c6034eb
commit 8c5c428622
1 changed files with 12 additions and 4 deletions
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16
include/fmt/format.h
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@ -1049,11 +1049,19 @@ inline auto equal2(const char* lhs, const char* rhs) -> bool {
} }
// Copies two characters from src to dst. // Copies two characters from src to dst.
template <typename Char> void copy2(Char* dst, const char* src) { template <typename Char>
*dst++ = static_cast<Char>(*src++); FMT_CONSTEXPR20 FMT_INLINE void copy2(Char* dst, const char* src) {
*dst = static_cast<Char>(*src); if (!is_constant_evaluated() && std::is_same<Char, char>::value) {
memcpy(dst, src, 2);
} else {
// We read both bytes before writing so that the compiler can do it in
// one pair of read/write instructions (even if Char aliases char)
char dc0 = *src++;
char dc1 = *src;
*dst++ = static_cast<Char>(dc0);
*dst = static_cast<Char>(dc1);
}
} }
FMT_INLINE void copy2(char* dst, const char* src) { memcpy(dst, src, 2); }
template <typename Iterator> struct format_decimal_result { template <typename Iterator> struct format_decimal_result {
Iterator begin; Iterator begin;