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support std::optional holding cv-qualified types (#4562)

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Fixes #4561
This commit is contained in:
Oleksandr Koval 2025-10-03 14:40:44 +03:00 committed by GitHub
parent 27ea09836a
commit 486e7ba579
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2 changed files with 2 additions and 1 deletions
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2
include/fmt/std.h
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@ -353,7 +353,7 @@ template <typename T, typename Char>
struct formatter<std::optional<T>, Char,
std::enable_if_t<is_formattable<T, Char>::value>> {
private:
formatter<T, Char> underlying_;
formatter<std::remove_cv_t<T>, Char> underlying_;
static constexpr basic_string_view<Char> optional =
detail::string_literal<Char, 'o', 'p', 't', 'i', 'o', 'n', 'a', 'l',
'('>{};

1
test/std-test.cc
View File

@ -145,6 +145,7 @@ TEST(std_test, optional) {
EXPECT_FALSE((fmt::is_formattable<unformattable>::value));
EXPECT_FALSE((fmt::is_formattable<std::optional<unformattable>>::value));
EXPECT_TRUE((fmt::is_formattable<std::optional<int>>::value));
EXPECT_TRUE((fmt::is_formattable<std::optional<const int>>::value));
#endif
}