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type_traits: value_list_unique[_t]

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This commit is contained in:
Michele Caini
2023-03-26 12:38:09 +02:00
parent 8c60faa1d0
commit b9f096d125
2 changed files with 33 additions and 0 deletions
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32
src/entt/core/type_traits.hpp
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@@ -500,6 +500,38 @@ struct value_list_cat<value_list<Value...>> {
template<typename... List>
using value_list_cat_t = typename value_list_cat<List...>::type;
/*! @brief Primary template isn't defined on purpose. */
template<typename>
struct value_list_unique;
/**
* @brief Removes duplicates values from a value list.
* @tparam Value One of the values provided by the given value list.
* @tparam Other The other values provided by the given value list.
*/
template<auto Value, auto... Other>
struct value_list_unique<value_list<Value, Other...>> {
/*! @brief A value list without duplicate types. */
using type = std::conditional_t<
((Value == Other) || ...),
typename value_list_unique<value_list<Other...>>::type,
value_list_cat_t<value_list<Value>, typename value_list_unique<value_list<Other...>>::type>>;
};
/*! @brief Removes duplicates values from a value list. */
template<>
struct value_list_unique<value_list<>> {
/*! @brief A value list without duplicate types. */
using type = value_list<>;
};
/**
* @brief Helper type.
* @tparam Type A value list.
*/
template<typename Type>
using value_list_unique_t = typename value_list_unique<Type>::type;
/*! @brief Same as std::is_invocable, but with tuples. */
template<typename, typename>
struct is_applicable: std::false_type {};

1
test/entt/core/type_traits.cpp
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@@ -125,6 +125,7 @@ TEST(ValueList, Functionalities) {
static_assert(std::is_same_v<entt::value_list_cat_t<value, other, value, other>, entt::value_list<0, 2, 1, 0, 2, 1>>);
static_assert(std::is_same_v<entt::value_list_cat_t<value, other>, entt::value_list<0, 2, 1>>);
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>>, entt::value_list<0, 2>>);
static_assert(entt::value_list_element_v<0u, value> == 0);
static_assert(entt::value_list_element_v<1u, value> == 2);