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adding a default format for std::chrono::time_point<std::chrono::syst… (#2345)

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sunmy2019
2021-06-12 01:52:39 +08:00
committed by GitHub
parent 55010a9d3a
commit f28cf3302d
3 changed files with 26 additions and 0 deletions
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23
include/fmt/chrono.h
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@@ -451,14 +451,37 @@ FMT_END_DETAIL_NAMESPACE
template <typename Char, typename Duration>
struct formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
Char> : formatter<std::tm, Char> {
FMT_CONSTEXPR formatter() {
this->specs = {default_specs, sizeof(default_specs) / sizeof(Char)};
}
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {
auto it = ctx.begin();
if (it != ctx.end() && *it == ':') ++it;
auto end = it;
while (end != ctx.end() && *end != '}') ++end;
if (end != it) this->specs = {it, detail::to_unsigned(end - it)};
return end;
}
template <typename FormatContext>
auto format(std::chrono::time_point<std::chrono::system_clock> val,
FormatContext& ctx) -> decltype(ctx.out()) {
std::tm time = localtime(val);
return formatter<std::tm, Char>::format(time, ctx);
}
static constexpr Char default_specs[] = {'%', 'Y', '-', '%', 'm', '-',
'%', 'd', ' ', '%', 'H', ':',
'%', 'M', ':', '%', 'S'};
};
template <typename Char, typename Duration>
constexpr Char
formatter<std::chrono::time_point<std::chrono::system_clock, Duration>,
Char>::default_specs[];
template <typename Char> struct formatter<std::tm, Char> {
template <typename ParseContext>
FMT_CONSTEXPR auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {