🛠️🐜 Antkeeper superbuild with dependencies included
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64 lines
1.6 KiB
64 lines
1.6 KiB
#ifndef ENTT_CORE_IDENT_HPP
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#define ENTT_CORE_IDENT_HPP
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#include <tuple>
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#include <utility>
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#include <type_traits>
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#include "../config/config.h"
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namespace entt {
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/**
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* @brief Types identifiers.
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*
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* Variable template used to generate identifiers at compile-time for the given
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* types. Use the `get` member function to know what's the identifier associated
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* to the specific type.
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*
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* @note
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* Identifiers are constant expression and can be used in any context where such
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* an expression is required. As an example:
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* @code{.cpp}
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* using id = entt::identifier<a_type, another_type>;
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*
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* switch(a_type_identifier) {
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* case id::type<a_type>:
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* // ...
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* break;
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* case id::type<another_type>:
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* // ...
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* break;
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* default:
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* // ...
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* }
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* @endcode
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*
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* @tparam Types List of types for which to generate identifiers.
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*/
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template<typename... Types>
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class identifier {
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using tuple_type = std::tuple<std::decay_t<Types>...>;
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template<typename Type, std::size_t... Indexes>
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static constexpr ENTT_ID_TYPE get(std::index_sequence<Indexes...>) ENTT_NOEXCEPT {
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static_assert(std::disjunction_v<std::is_same<Type, Types>...>);
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return (0 + ... + (std::is_same_v<Type, std::tuple_element_t<Indexes, tuple_type>> ? ENTT_ID_TYPE(Indexes) : ENTT_ID_TYPE{}));
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}
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public:
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/*! @brief Unsigned integer type. */
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using identifier_type = ENTT_ID_TYPE;
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/*! @brief Statically generated unique identifier for the given type. */
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template<typename Type>
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static constexpr identifier_type type = get<std::decay_t<Type>>(std::make_index_sequence<sizeof...(Types)>{});
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};
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}
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#endif // ENTT_CORE_IDENT_HPP
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