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type_traits: try to please older compilers too

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This commit is contained in:
Michele Caini
2023-10-31 15:41:24 +01:00
parent 2a3ae06d85
commit 7a2c5753c5
1 changed files with 9 additions and 3 deletions
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12
src/entt/core/type_traits.hpp
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@@ -783,19 +783,25 @@ template<typename Type>
[[nodiscard]] constexpr bool dispatch_is_equality_comparable() {
if constexpr(std::is_array_v<Type>) {
return false;
} else if constexpr(has_tuple_size_value<Type>::value) {
return maybe_equality_comparable<Type>(0) && unpack_maybe_equality_comparable<Type>(std::make_index_sequence<std::tuple_size<Type>::value>{});
} else if constexpr(is_iterator_v<Type>) {
return maybe_equality_comparable<Type>(0);
} else if constexpr(has_value_type<Type>::value) {
if constexpr(is_iterator_v<Type> || std::is_same_v<typename Type::value_type, Type>) {
if constexpr(std::is_same_v<typename Type::value_type, Type>) {
return maybe_equality_comparable<Type>(0);
} else if constexpr(dispatch_is_equality_comparable<typename Type::value_type>()) {
return maybe_equality_comparable<Type>(0);
} else {
return false;
}
} else if constexpr(is_complete_v<std::tuple_size<std::remove_cv_t<Type>>>) {
if constexpr(has_tuple_size_value<Type>::value) {
return maybe_equality_comparable<Type>(0) && unpack_maybe_equality_comparable<Type>(std::make_index_sequence<std::tuple_size<Type>::value>{});
} else {
return maybe_equality_comparable<Type>(0);
}
} else {
return maybe_equality_comparable<Type>(0);
}
}
} // namespace internal