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Add formatters for chrono::time_point and helper overloads for localtime/gmtime(time_point)

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Fixes #1819
This commit is contained in:
Adam Burgess 2020-08-26 04:45:06 +10:00
parent c7e6d8afb0
commit 75c59ed3ba
2 changed files with 43 additions and 0 deletions
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21
include/fmt/chrono.h
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@ -351,6 +351,11 @@ inline std::tm localtime(std::time_t time) {
return lt.tm_;
}
inline std::tm localtime(
std::chrono::time_point<std::chrono::system_clock> time_point) {
return localtime(std::chrono::system_clock::to_time_t(time_point));
}
// Thread-safe replacement for std::gmtime
inline std::tm gmtime(std::time_t time) {
struct dispatcher {
@ -387,6 +392,11 @@ inline std::tm gmtime(std::time_t time) {
return gt.tm_;
}
inline std::tm gmtime(
std::chrono::time_point<std::chrono::system_clock> time_point) {
return gmtime(std::chrono::system_clock::to_time_t(time_point));
}
namespace detail {
inline size_t strftime(char* str, size_t count, const char* format,
const std::tm* time) {
@ -399,6 +409,17 @@ inline size_t strftime(wchar_t* str, size_t count, const wchar_t* format,
}
} // namespace detail
template <typename Char>
struct formatter<std::chrono::time_point<std::chrono::system_clock>, Char>
: formatter<std::tm, Char> {
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);
}
};
template <typename Char> struct formatter<std::tm, Char> {
template <typename ParseContext>
auto parse(ParseContext& ctx) -> decltype(ctx.begin()) {

22
test/chrono-test.cc
View File

@ -95,6 +95,28 @@ TEST(TimeTest, GMTime) {
EXPECT_TRUE(EqualTime(tm, fmt::gmtime(t)));
}
TEST(TimeTest, TimePoint) {
setenv("TZ", "EST+5", 1);
tzset();
std::chrono::system_clock::time_point point(std::chrono::seconds(1598412345));
EXPECT_EQ("It is 2020-08-25 22:25:45.",
fmt::format("It is {:%Y-%m-%d %H:%M:%S}.", point));
}
TEST(TimeTest, LocalTimeWithTimePoint) {
setenv("TZ", "EST+5", 1);
tzset();
std::chrono::system_clock::time_point point(std::chrono::seconds(1598412345));
EXPECT_EQ("It is 2020-08-25 22:25:45.",
fmt::format("It is {:%Y-%m-%d %H:%M:%S}.", fmt::localtime(point)));
}
TEST(TimeTest, GMTimeWithTimePoint) {
std::chrono::system_clock::time_point point(std::chrono::seconds(1598412345));
EXPECT_EQ("It is 2020-08-26 03:25:45 UTC.",
fmt::format("It is {:%Y-%m-%d %H:%M:%S} UTC.", fmt::gmtime(point)));
}
#define EXPECT_TIME(spec, time, duration) \
{ \
std::locale loc("ja_JP.utf8"); \