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libstdc++: Add test for std::con/disjunction's base class

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libstdc++-v3/ChangeLog:

	* testsuite/20_util/logical_traits/requirements/base_classes.cc: New test.
This commit is contained in:
Patrick Palka 2022-08-27 10:15:55 -04:00
parent 4d291ca6a4
commit cace77f4fb
1 changed files with 34 additions and 0 deletions
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libstdc++-v3/testsuite/20_util/logical_traits/requirements/base_classes.cc Normal file
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// { 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>>>);