blob: 5944ea28ddab0f760b795385a91510e90ebbe9a3 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
|
#ifndef ENTT_CORE_IDENT_HPP
#define ENTT_CORE_IDENT_HPP
#include <cstddef>
#include <type_traits>
#include <utility>
#include "fwd.hpp"
#include "type_traits.hpp"
namespace entt {
/**
* @brief Type integral identifiers.
* @tparam Type List of types for which to generate identifiers.
*/
template<typename... Type>
class ident {
template<typename Curr, std::size_t... Index>
[[nodiscard]] static constexpr id_type get(std::index_sequence<Index...>) noexcept {
static_assert((std::is_same_v<Curr, Type> || ...), "Invalid type");
return (0 + ... + (std::is_same_v<Curr, type_list_element_t<Index, type_list<std::decay_t<Type>...>>> ? id_type{Index} : id_type{}));
}
public:
/*! @brief Unsigned integer type. */
using value_type = id_type;
/*! @brief Statically generated unique identifier for the given type. */
template<typename Curr>
static constexpr value_type value = get<std::decay_t<Curr>>(std::index_sequence_for<Type...>{});
};
} // namespace entt
#endif
|
