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author | Patrick Palka <ppalka@redhat.com> | 2022-08-27 10:15:55 -0400 |
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committer | Patrick Palka <ppalka@redhat.com> | 2022-08-27 10:15:55 -0400 |
commit | cace77f4fb8df18c01dfdf9040cc944eedef1147 (patch) | |
tree | 2b469a89ce66440f223e307febf12923007ef3bc /libstdc++-v3 | |
parent | 4d291ca6a48eeeef3f51b8ab8452fe2166f021ee (diff) | |
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libstdc++: Add test for std::con/disjunction's base class
libstdc++-v3/ChangeLog:
* testsuite/20_util/logical_traits/requirements/base_classes.cc: New test.
Diffstat (limited to 'libstdc++-v3')
-rw-r--r-- | libstdc++-v3/testsuite/20_util/logical_traits/requirements/base_classes.cc | 34 |
1 files changed, 34 insertions, 0 deletions
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 0000000..9067a3b --- /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>>>); |