Program Listing for File index_of_impl_.hpp

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#ifndef RIPPLE_UTILITY_DETAIL_INDEX_OF_IMPL__HPP
#define RIPPLE_UTILITY_DETAIL_INDEX_OF_IMPL__HPP

#include <type_traits>

namespace ripple::detail {

template <int I, typename T, typename... Ts>
struct IndexOf;

template <int I, typename T, typename U, typename... Ts>
struct IndexOf<I, T, U, Ts...> {
  static constexpr auto value =
    std::is_same_v<T, U> ? I : IndexOf<I + 1, T, Ts...>::value;
};

template <int I, typename T>
struct IndexOf<I, T> {
  static constexpr auto value = I;
};

} // namespace ripple::detail

#endif // RIPPLE_UTILITY_DETAIL_INDEX_OF_IMPL__HPP