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adding a default format for std::chrono::time_point<std::chrono::system_clock, Duration>

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This commit is contained in:
sunmy 2021-06-08 02:24:26 +08:00
parent d551b88a6d
commit 278929303e
2 changed files with 22 additions and 0 deletions
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21
include/fmt/chrono.h
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@ -451,6 +451,27 @@ 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 FMT_INLINE void generate_defalut_spec(char) {
this->specs = "%Y-%m-%d %H:%M:%S";
}
FMT_CONSTEXPR FMT_INLINE void generate_defalut_spec(wchar_t) {
this->specs = L"%Y-%m-%d %H:%M:%S";
}
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) {
generate_defalut_spec(typename ParseContext::char_type{});
} else {
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()) {

1
test/chrono-test.cc
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@ -99,6 +99,7 @@ template <typename TimePoint> auto strftime(TimePoint tp) -> std::string {
TEST(chrono_test, time_point) {
auto t1 = std::chrono::system_clock::now();
EXPECT_EQ(strftime(t1), fmt::format("{:%Y-%m-%d %H:%M:%S}", t1));
EXPECT_EQ(strftime(t1), fmt::format("{}", t1));
using time_point =
std::chrono::time_point<std::chrono::system_clock, std::chrono::seconds>;
auto t2 = time_point(std::chrono::seconds(42));