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Fix range suppresor formatter (#4660)

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Soumik15630m 2026-01-30 20:09:00 +05:30 committed by GitHub
parent cf74caae38
commit 5cc5072aa6
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2 changed files with 40 additions and 2 deletions
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12
include/fmt/ranges.h
View File

@ -746,7 +746,6 @@ struct formatter<tuple_join_view<Tuple, Char>, Char,
return do_format(value, ctx, std::integral_constant<size_t, N - 1>());
}
};
namespace detail {
// Check if T has an interface like a container adaptor (e.g. std::stack,
// std::queue, std::priority_queue).
@ -766,10 +765,19 @@ template <typename Container> struct all {
};
} // namespace detail
/**
* returns "true" if "T" is a container adaptor (like "std::stack")
* that should be formatted by iterating over the underlying container.
* */
FMT_EXPORT
template <typename T>
struct is_container_adaptor : detail::is_container_adaptor_like<T> {};
template <typename T, typename Char>
struct formatter<
T, Char,
enable_if_t<conjunction<detail::is_container_adaptor_like<T>,
enable_if_t<conjunction<is_container_adaptor<T>,
bool_constant<range_format_kind<T, Char>::value ==
range_format::disabled>>::value>>
: formatter<detail::all<typename T::container_type>, Char> {

30
test/ranges-test.cc
View File

@ -797,3 +797,33 @@ struct not_range {
void end() const {}
};
static_assert(!fmt::is_formattable<not_range>{}, "");
namespace test_detail {
template <typename T>
struct partial_opt_out_wrapper {
using container_type = std::vector<T>;
std::vector<T> c = {1, 2, 3};
};
} // namespace test_detail
namespace fmt {
template <typename T>
struct is_container_adaptor<test_detail::partial_opt_out_wrapper<T>> : std::false_type {};
template <typename T>
struct formatter<test_detail::partial_opt_out_wrapper<T>> {
constexpr fmt::format_parse_context::iterator parse(fmt::format_parse_context& ctx) const {
return ctx.begin();
}
fmt::format_context::iterator format(const test_detail::partial_opt_out_wrapper<T>& val,
fmt::format_context& ctx) const {
return fmt::format_to(ctx.out(), "PartialOptOut(size={})", val.c.size());
}
};
} // namespace fmt
TEST(ranges_test, container_adaptor_partial_specialization) {
test_detail::partial_opt_out_wrapper<int> obj;
EXPECT_EQ(fmt::format("{}", obj), "PartialOptOut(size=3)");
}