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Simplify format string compilation

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This commit is contained in:
Victor Zverovich 2019-08-24 09:34:22 -07:00
parent ffe29a92f4
commit 643aa4c8c4
1 changed files with 4 additions and 35 deletions
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39
include/fmt/compile.h
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@ -176,7 +176,7 @@ class prepared_format {
using char_type = char_t<Format>;
using format_part_t = format_part<char_type>;
prepared_format(Format f)
constexpr prepared_format(Format f)
: format_(std::move(f)), parts_provider_(to_string_view(format_)) {}
prepared_format() = delete;
@ -518,45 +518,14 @@ struct preparator<PassedFormat, prepared_format<PreparedFormatFormat,
return prepared_format_type(std::move(format));
}
};
struct compiletime_format_tag {};
struct runtime_format_tag {};
template <typename Format> struct format_tag {
using type = conditional_t<is_compile_string<Format>::value,
compiletime_format_tag, runtime_format_tag>;
};
#if FMT_USE_CONSTEXPR
template <typename Format, typename... Args>
auto do_compile(runtime_format_tag, Format format) {
return preparator<Format, Args...>::prepare(std::move(format));
}
template <typename Format, typename... Args>
FMT_CONSTEXPR auto do_compile(compiletime_format_tag, const Format& format) {
return typename basic_prepared_format<Format, void, Args...>::type(format);
}
#else
template <typename Format, typename... Args>
auto do_compile(const Format& format)
-> decltype(preparator<Format, Args...>::prepare(format)) {
return preparator<Format, Args...>::prepare(format);
}
#endif
template <typename... Args>
using prepared_format_t =
typename basic_prepared_format<std::string, parts_container<char>,
Args...>::type;
} // namespace internal
#if FMT_USE_CONSTEXPR
template <typename... Args, typename S,
FMT_ENABLE_IF(is_compile_string<S>::value)>
FMT_CONSTEXPR auto compile(S format_str) {
return internal::do_compile<S, Args...>(
typename internal::format_tag<S>::type{}, std::move(format_str));
return typename internal::basic_prepared_format<S, void, Args...>::type(
format_str);
}
#endif
@ -566,7 +535,7 @@ auto compile(const Char (&format_str)[N]) ->
Args...>::prepared_format_type {
const auto view = basic_string_view<Char>(format_str, N - 1);
return internal::preparator<std::basic_string<Char>, Args...>::prepare(
internal::to_runtime_format(view));
internal::to_runtime_format(view));
}
template <typename CompiledFormat, typename... Args,