map_enumerators.hpp

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#ifndef EAGINE_REFLECT_MAP_ENUMERATORS_HPP
#define EAGINE_REFLECT_MAP_ENUMERATORS_HPP
 
#include "../selector.hpp"
#include "decl_name.hpp"
#include <array>
#include <type_traits>
 
namespace eagine {
//------------------------------------------------------------------------------
template <typename T>
struct enumerator_and_name {
    constexpr enumerator_and_name(decl_name n, T e) noexcept
      : name{n}
      , enumerator{e} {}
 
    const decl_name name;
    const T enumerator;
};
//------------------------------------------------------------------------------
template <typename T, std::size_t N>
using enumerator_map_type = std::array<enumerator_and_name<T>, N>;
//------------------------------------------------------------------------------
template <typename T, typename Selector>
struct does_have_enumerator_mapping {
private:
    template <
      typename X,
      typename = decltype(enumerator_mapping(type_identity<X>(), Selector()))>
    static auto _test(X*) -> std::true_type;
    static auto _test(...) -> std::false_type;
 
public:
    // NOLINTNEXTLINE(hicpp-vararg)
    using type = decltype(_test(static_cast<std::remove_cv_t<T>*>(nullptr)));
};
//------------------------------------------------------------------------------
template <typename T, typename Selector = default_selector_t>
using has_enumerator_mapping_t =
  typename does_have_enumerator_mapping<T, Selector>::type;
 
template <typename T, typename Selector = default_selector_t>
constexpr const bool has_enumerator_mapping_v =
  has_enumerator_mapping_t<T, Selector>::value;
//------------------------------------------------------------------------------
} // namespace eagine
 
#endif // EAGINE_REFLECT_MAP_ENUMERATORS_HPP