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Optimize format string compilation

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This commit is contained in:
Victor Zverovich
2023-06-14 21:46:15 +03:00
parent 6ad301235f
commit 1daae555b3
2 changed files with 13 additions and 1 deletions
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7
include/fmt/compile.h
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@ -221,7 +221,12 @@ template <typename Char, typename T, int N> struct field {
template <typename OutputIt, typename... Args> template <typename OutputIt, typename... Args>
constexpr OutputIt format(OutputIt out, const Args&... args) const { constexpr OutputIt format(OutputIt out, const Args&... args) const {
return write<Char>(out, get_arg_checked<T, N>(args...)); const T& arg = get_arg_checked<T, N>(args...);
if constexpr (std::is_convertible_v<T, basic_string_view<Char>>) {
auto s = basic_string_view<Char>(arg);
return copy_str<Char>(s.begin(), s.end(), out);
}
return write<Char>(out, arg);
} }
}; };

7
include/fmt/core.h
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@ -1486,6 +1486,13 @@ auto copy_str(InputIt begin, InputIt end, appender out) -> appender {
get_container(out).append(begin, end); get_container(out).append(begin, end);
return out; return out;
} }
template <typename Char, typename InputIt>
auto copy_str(InputIt begin, InputIt end,
std::back_insert_iterator<std::string> out)
-> std::back_insert_iterator<std::string> {
get_container(out).append(begin, end);
return out;
}
template <typename Char, typename R, typename OutputIt> template <typename Char, typename R, typename OutputIt>
FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt { FMT_CONSTEXPR auto copy_str(R&& rng, OutputIt out) -> OutputIt {