index.hpp

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#ifndef UTIL_META_FIND_HPP_
#define UTIL_META_FIND_HPP_
 
#include <type_traits>
 
namespace util::meta
{
    template <typename T, typename... Ts>
    struct index;
 
    template <typename T, typename... Ts>
    struct index<T, T, Ts...> : std::integral_constant<std::size_t, 0> {};
 
    template <typename T, typename U, typename... Ts>
    struct index<T, U, Ts...> : std::integral_constant<std::size_t, 1 + index<T, Ts...>::value> {};
 
    template <typename T, typename... Ts>
    constexpr inline std::size_t index_v = index<T, Ts...>::value;
 
} // namespace util::meta
 
#endif /* !UTIL_META_CONTAINS_HPP_ */