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is_equality_comparable: detect C-style arrays directly

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This commit is contained in:
Michele Caini
2022-12-12 18:32:07 +01:00
parent 5db8ad53ac
commit 423f7a555d
2 changed files with 5 additions and 0 deletions
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4
src/entt/core/type_traits.hpp
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@@ -658,6 +658,10 @@ template<typename Type>
struct is_equality_comparable<Type, std::void_t<decltype(std::declval<Type>() == std::declval<Type>())>>
: std::bool_constant<internal::maybe_equality_comparable<Type>(choice<2>)> {};
/*! @copydoc is_equality_comparable */
template<typename Type, auto N>
struct is_equality_comparable<Type[N]>: std::false_type {};
/**
* @brief Helper variable template.
* @tparam Type The type to test.

1
test/entt/core/type_traits.cpp
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@@ -183,6 +183,7 @@ TEST(IsEqualityComparable, Functionalities) {
static_assert(entt::is_equality_comparable_v<std::vector<not_comparable>::iterator>);
static_assert(entt::is_equality_comparable_v<nlohmann_json_like>);
static_assert(!entt::is_equality_comparable_v<int[3u]>);
static_assert(!entt::is_equality_comparable_v<not_comparable>);
static_assert(!entt::is_equality_comparable_v<const not_comparable>);
static_assert(!entt::is_equality_comparable_v<std::vector<not_comparable>>);