fields.hpp

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#ifndef CODEX_REFLECTION_FIELDS_DETAIL_HPP
#define CODEX_REFLECTION_FIELDS_DETAIL_HPP
 
#include <cstdio>
#include <tuple>
#include <utility>
 
namespace codex::refl::detail {
 
template<auto>
struct to_any {
    template<typename T> constexpr operator T(void);
};
 
template<std::size_t N> struct field_tuple_impl;
 
// Could potentially be implemented in a more concise manner with auxiliary
// infrastructure such as Boost.Preprocessor.
#define X(n, ...) \
    template<> \
    struct field_tuple_impl<n> { \
        decltype(auto) operator()(auto &&x) { \
            auto &&[__VA_ARGS__] = std::forward<decltype(x)>(x); \
            return std::tie(__VA_ARGS__); \
        } \
    };
X(1, _0)
X(2, _0, _1)
X(3, _0, _1, _2)
X(4, _0, _1, _2, _3)
#undef X
 
}
 
#endif