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Simplify is_variant_like_ check, fix compile error before GCC 11 (#3072)

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Co-authored-by: Vladislav Shchapov <vladislav@shchapov.ru>

Co-authored-by: Vladislav Shchapov <vladislav@shchapov.ru>
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NewbieOrange 2022-09-03 12:08:07 +08:00 committed by GitHub
parent fec5515c55
commit 29c6000137
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2 changed files with 7 additions and 6 deletions
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10
include/fmt/std.h
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@ -101,14 +101,12 @@ template <typename T>
using variant_index_sequence =
std::make_index_sequence<std::variant_size<T>::value>;
// variant_size and variant_alternative check.
template <typename T, typename U = void>
template <typename>
struct is_variant_like_ : std::false_type {};
template <typename T>
struct is_variant_like_<T, std::void_t<decltype(std::variant_size<T>::value)>>
: std::true_type {};
template <typename... Types>
struct is_variant_like_<std::variant<Types...>> : std::true_type {};
// formattable element check
// formattable element check.
template <typename T, typename C> class is_variant_formattable_ {
template <std::size_t... I>
static std::conjunction<

3
test/std-test.cc
View File

@ -75,6 +75,9 @@ TEST(std_test, variant) {
EXPECT_EQ(fmt::format("{}", v4), "variant(monostate)");
EXPECT_EQ(fmt::format("{}", v5), "variant(\"yes, this is variant\")");
volatile int i = 42; // Test compile error before GCC 11 described in #3068.
EXPECT_EQ(fmt::format("{}", i), "42");
#endif
}