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type traits: make type_list_cat work with vs2017

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This commit is contained in:
Michele Caini
2020-10-13 12:21:54 +02:00
parent ce0db9b968
commit 718f964de7
1 changed files with 38 additions and 1 deletions
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39
src/entt/core/type_traits.hpp
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@@ -119,12 +119,49 @@ template<typename... Type, typename... Other>
constexpr type_list<Type..., Other...> operator+(type_list<Type...>, type_list<Other...>) { return {}; }
/*! @brief Primary template isn't defined on purpose. */
template<typename...>
struct type_list_cat;
/*! @brief Concatenates multiple type lists. */
template<>
struct type_list_cat<> {
/*! @brief A type list composed by the types of all the type lists. */
using type = type_list<>;
};
/**
* @brief Concatenates multiple type lists.
* @tparam Type Types provided by the first type list.
* @tparam Other Types provided by the second type list.
* @tparam List Other type lists, if any.
*/
template<typename... Type, typename... Other, typename... List>
struct type_list_cat<type_list<Type...>, type_list<Other...>, List...> {
/*! @brief A type list composed by the types of all the type lists. */
using type = typename type_list_cat<type_list<Type..., Other...>, List...>::type;
};
/**
* @brief Concatenates multiple type lists.
* @tparam Type Types provided by the type list.
*/
template<typename... Type>
struct type_list_cat<type_list<Type...>> {
/*! @brief A type list composed by the types of all the type lists. */
using type = type_list<Type...>;
};
/**
* @brief Helper type.
* @tparam List Type lists to concatenate.
*/
template<typename... List>
using type_list_cat_t = decltype((type_list<>{} + ... + List{}));
using type_list_cat_t = typename type_list_cat<List...>::type;
/*! @brief Primary template isn't defined on purpose. */