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Fix copy_str performance #2475

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Fix copy_str performance #2475

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13 changes: 1 addition & 12 deletions include/fmt/core.h
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Original file line number Diff line number Diff line change
Expand Up @@ -742,18 +742,7 @@ inline auto get_container(std::back_insert_iterator<Container> it)
template <typename Char, typename InputIt, typename OutputIt>
FMT_CONSTEXPR auto copy_str(InputIt begin, InputIt end, OutputIt out)
-> OutputIt {
while (begin != end) *out++ = static_cast<Char>(*begin++);
return out;
}

template <typename Char, FMT_ENABLE_IF(std::is_same<Char, char>::value)>
FMT_CONSTEXPR auto copy_str(const Char* begin, const Char* end, Char* out)
-> Char* {
if (is_constant_evaluated())
return copy_str<Char, const Char*, Char*>(begin, end, out);
auto size = to_unsigned(end - begin);
memcpy(out, begin, size);
return out + size;
return std::copy(begin, end, out);
}

/**
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