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Fix copy_str performance (#2477)

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This commit is contained in:
Roman-Koshelev
2021-09-02 17:25:26 +03:00
committed by GitHub
parent 2520f410c8
commit 8029bf955c
1 changed files with 8 additions and 5 deletions
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13
include/fmt/core.h
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@ -332,6 +332,8 @@ template <bool B> using bool_constant = std::integral_constant<bool, B>;
template <typename T> template <typename T>
using remove_reference_t = typename std::remove_reference<T>::type; using remove_reference_t = typename std::remove_reference<T>::type;
template <typename T> template <typename T>
using remove_const_t = typename std::remove_const<T>::type;
template <typename T>
using remove_cvref_t = typename std::remove_cv<remove_reference_t<T>>::type; using remove_cvref_t = typename std::remove_cv<remove_reference_t<T>>::type;
template <typename T> struct type_identity { using type = T; }; template <typename T> struct type_identity { using type = T; };
template <typename T> using type_identity_t = typename type_identity<T>::type; template <typename T> using type_identity_t = typename type_identity<T>::type;
@ -755,13 +757,14 @@ FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out)
return out; return out;
} }
template <typename Char, FMT_ENABLE_IF(std::is_same<Char, char>::value)> template <typename Char, typename T, typename U,
FMT_CONSTEXPR auto copy_str(const Char* begin, const Char* end, Char* out) FMT_ENABLE_IF(std::is_same<remove_const_t<T>, U>::value && is_char<U>::value)>
-> Char* { FMT_CONSTEXPR auto copy_str(T* begin, T* end, U* out)
-> U* {
if (is_constant_evaluated()) if (is_constant_evaluated())
return copy_str<Char, const Char*, Char*>(begin, end, out); return copy_str<Char, T*, U*>(begin, end, out);
auto size = to_unsigned(end - begin); auto size = to_unsigned(end - begin);
memcpy(out, begin, size); memcpy(out, begin, size * sizeof(U));
return out + size; return out + size;
} }