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Optimize %T in tm formatting

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This commit is contained in:
Vladislav Shchapov 2021-09-13 11:42:26 +05:00 committed by Victor Zverovich
parent aaeca12d89
commit 92614ecbf9
2 changed files with 12 additions and 1 deletions
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12
include/fmt/chrono.h
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@ -549,6 +549,7 @@ template <typename Char> struct formatter<std::tm, Char> {
enum class spec {
unknown,
year_month_day,
hh_mm_ss,
};
spec spec_ = spec::unknown;
@ -563,7 +564,10 @@ template <typename Char> struct formatter<std::tm, Char> {
while (end != ctx.end() && *end != '}') ++end;
auto size = detail::to_unsigned(end - it);
specs = {it, size};
if (specs == string_view("%F", 2)) spec_ = spec::year_month_day;
if (specs == string_view("%F", 2))
spec_ = spec::year_month_day;
else if (specs == string_view("%T", 2))
spec_ = spec::hh_mm_ss;
return end;
}
@ -578,6 +582,12 @@ template <typename Char> struct formatter<std::tm, Char> {
detail::to_unsigned(tm.tm_mon + 1),
detail::to_unsigned(tm.tm_mday), '-');
return std::copy_n(buf, sizeof(buf), ctx.out());
} else if (spec_ == spec::hh_mm_ss) {
char buf[8];
detail::write_digit2_separated(buf, detail::to_unsigned(tm.tm_hour),
detail::to_unsigned(tm.tm_min),
detail::to_unsigned(tm.tm_sec), ':');
return std::copy_n(buf, sizeof(buf), ctx.out());
}
basic_memory_buffer<Char> tm_format;
tm_format.append(specs.begin(), specs.end());

1
test/chrono-test.cc
View File

@ -49,6 +49,7 @@ TEST(chrono_test, format_tm) {
EXPECT_EQ(fmt::format("The date is {:%Y-%m-%d %H:%M:%S}.", tm),
"The date is 2016-04-25 11:22:33.");
EXPECT_EQ(fmt::format("{:%F}", tm), "2016-04-25");
EXPECT_EQ(fmt::format("{:%T}", tm), "11:22:33");
}
TEST(chrono_test, grow_buffer) {