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From: Patrick Palka <ppalka@gcc.gnu.org> To: gcc-cvs@gcc.gnu.org, libstdc++-cvs@gcc.gnu.org Subject: [gcc r13-2236] libstdc++: Add test for std::con/disjunction's base class Date: Sat, 27 Aug 2022 14:16:38 +0000 (GMT) [thread overview] Message-ID: <20220827141638.1CB89381E088@sourceware.org> (raw) https://gcc.gnu.org/g:cace77f4fb8df18c01dfdf9040cc944eedef1147 commit r13-2236-gcace77f4fb8df18c01dfdf9040cc944eedef1147 Author: Patrick Palka <ppalka@redhat.com> Date: Sat Aug 27 10:15:55 2022 -0400 libstdc++: Add test for std::con/disjunction's base class libstdc++-v3/ChangeLog: * testsuite/20_util/logical_traits/requirements/base_classes.cc: New test. Diff: --- .../logical_traits/requirements/base_classes.cc | 34 ++++++++++++++++++++++ 1 file changed, 34 insertions(+) diff --git a/libstdc++-v3/testsuite/20_util/logical_traits/requirements/base_classes.cc b/libstdc++-v3/testsuite/20_util/logical_traits/requirements/base_classes.cc new file mode 100644 index 00000000000..9067a3b670e --- /dev/null +++ b/libstdc++-v3/testsuite/20_util/logical_traits/requirements/base_classes.cc @@ -0,0 +1,34 @@ +// { dg-do compile { target c++17 } } + +#include <type_traits> + +template<int> struct T : std::true_type { }; +template<int> struct F : std::false_type { }; + +// [meta.logical]/5: The specialization conjunction<B_1, ..., B_n> has a +// public and unambiguous base that is either: +// - the first type B_i in the list true_type, B_1, ..., B_n for which +// bool(B_i::value) is false, or +// - if there is no such B_i, the last type in the list. + +static_assert(std::is_base_of_v<std::true_type, std::conjunction<>>); +static_assert(std::is_base_of_v<T<0>, std::conjunction<T<0>>>); +static_assert(std::is_base_of_v<F<0>, std::conjunction<F<0>>>); +static_assert(std::is_base_of_v<T<1>, std::conjunction<T<0>, T<1>>>); +static_assert(std::is_base_of_v<F<0>, std::conjunction<F<0>, F<1>>>); +static_assert(std::is_base_of_v<F<0>, std::conjunction<T<0>, F<0>, F<1>>>); +static_assert(std::is_base_of_v<F<0>, std::conjunction<T<0>, F<0>, T<1>, F<1>>>); + +// [meta.logical]/10: The specialization disjunction<B_1, ..., B_n> has a +// public and unambiguous base that is either: +// - the first type B_i in the list false_type, B_1, ..., B_n for which +// bool(B_i::value) is true, or +// - if there is no such B_i, the last type in the list. + +static_assert(std::is_base_of_v<std::false_type, std::disjunction<>>); +static_assert(std::is_base_of_v<T<0>, std::disjunction<T<0>>>); +static_assert(std::is_base_of_v<F<0>, std::disjunction<F<0>>>); +static_assert(std::is_base_of_v<T<0>, std::disjunction<T<0>, T<1>>>); +static_assert(std::is_base_of_v<F<1>, std::disjunction<F<0>, F<1>>>); +static_assert(std::is_base_of_v<T<0>, std::disjunction<T<0>, F<0>, F<1>>>); +static_assert(std::is_base_of_v<T<0>, std::disjunction<T<0>, F<0>, T<1>, F<1>>>);
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