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type_traits: value_list_contains[_v]

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This commit is contained in:
Michele Caini
2023-03-26 12:42:15 +02:00
parent 28b11912ab
commit b272e04bab
2 changed files with 30 additions and 0 deletions
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26
src/entt/core/type_traits.hpp
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@@ -532,6 +532,32 @@ struct value_list_unique<value_list<>> {
template<typename Type>
using value_list_unique_t = typename value_list_unique<Type>::type;
/**
* @brief Provides the member constant `value` to true if a value list contains
* a given value, false otherwise.
* @tparam List Value list.
* @tparam Value Value to look for.
*/
template<typename List, auto Value>
struct value_list_contains;
/**
* @copybrief value_list_contains
* @tparam Value Values provided by the value list.
* @tparam Other Value to look for.
*/
template<auto... Value, auto Other>
struct value_list_contains<value_list<Value...>, Other>
: std::bool_constant<((Value == Other) || ...)> {};
/**
* @brief Helper variable template.
* @tparam List Value list.
* @tparam Value Value to look for.
*/
template<typename List, auto Value>
inline constexpr bool value_list_contains_v = value_list_contains<List, Value>::value;
/*! @brief Same as std::is_invocable, but with tuples. */
template<typename, typename>
struct is_applicable: std::false_type {};

4
test/entt/core/type_traits.cpp
View File

@@ -127,6 +127,10 @@ TEST(ValueList, Functionalities) {
static_assert(std::is_same_v<entt::value_list_cat_t<value, value>, entt::value_list<0, 2, 0, 2>>);
static_assert(std::is_same_v<entt::value_list_unique_t<entt::value_list_cat_t<value, value>>, value>);
static_assert(entt::value_list_contains_v<value, 0>);
static_assert(entt::value_list_contains_v<value, 2>);
static_assert(!entt::value_list_contains_v<value, 1>);
static_assert(entt::value_list_element_v<0u, value> == 0);
static_assert(entt::value_list_element_v<1u, value> == 2);
static_assert(entt::value_list_element_v<0u, other> == 1);