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Add std::locale support to std::tm formatter

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This commit is contained in:
Vladislav Shchapov 2021-10-17 19:11:58 +05:00
parent 22948841d6
commit 3b61933abe
2 changed files with 11 additions and 1 deletions
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4
include/fmt/chrono.h
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@ -1744,7 +1744,9 @@ template <typename Char> struct formatter<std::tm, Char> {
template <typename FormatContext>
auto format(const std::tm& tm, FormatContext& ctx) const
-> decltype(ctx.out()) {
const auto& loc = std::locale::classic();
const auto& loc_ref = ctx.locale();
const auto& loc =
loc_ref ? loc_ref.template get<std::locale>() : std::locale::classic();
auto w = detail::tm_writer<decltype(ctx.out()), Char>(loc, ctx.out(), tm);
if (spec_ == spec::year_month_day)
w.on_iso_date();

8
test/chrono-test.cc
View File

@ -536,10 +536,18 @@ TEST(chrono_test, weekday) {
auto loc = get_locale("ru_RU.UTF-8");
std::locale::global(loc);
auto mon = fmt::weekday(1);
auto tm = std::tm();
tm.tm_wday = static_cast<int>(mon.c_encoding());
EXPECT_EQ(fmt::format("{}", mon), "Mon");
EXPECT_EQ(fmt::format("{:%a}", tm), "Mon");
if (loc != std::locale::classic()) {
EXPECT_THAT((std::vector<std::string>{"пн", "Пн", "пнд", "Пнд"}),
Contains(fmt::format(loc, "{:L}", mon)));
EXPECT_THAT((std::vector<std::string>{"пн", "Пн", "пнд", "Пнд"}),
Contains(fmt::format(loc, "{:%a}", tm)));
}
}