183 lines
8.3 KiB
C++
183 lines
8.3 KiB
C++
#pragma once
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// support basic reflection through template meta programming
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#include <tuple>
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#include <string_view>
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#include <source_location>
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namespace clice::impl {
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struct Any {
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consteval Any(std::size_t);
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template <typename T>
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consteval operator T () const;
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};
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template <typename T, std::size_t N>
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consteval auto test() {
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return []<std::size_t... I>(std::index_sequence<I...>) {
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return requires { T{Any(I)...}; };
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}(std::make_index_sequence<N>{});
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}
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template <typename T, std::size_t N = 0>
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consteval auto member_count() {
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if constexpr(test<T, N>() && !test<T, N + 1>()) {
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return N;
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} else {
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return member_count<T, N + 1>();
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}
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}
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template <typename T>
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struct Wrapper {
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T value;
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constexpr Wrapper(T value) : value(value) {}
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};
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template <Wrapper T>
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constexpr auto member_name() {
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std::string_view name = std::source_location::current().function_name();
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#if __GNUC__ && (!__clang__) && (!_MSC_VER)
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std::size_t start = name.rfind("::") + 2;
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std::size_t end = name.rfind(')');
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return name.substr(start, end - start);
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#elif __clang__
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std::size_t start = name.rfind(".") + 1;
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std::size_t end = name.rfind('}');
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return name.substr(start, end - start);
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#elif _MSC_VER
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std::size_t start = name.rfind("->") + 2;
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std::size_t end = name.rfind('}');
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return name.substr(start, end - start);
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#else
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static_assert(false, "Not supported compiler");
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#endif
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}
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template <std::size_t count, typename Object>
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constexpr auto collcet_members(Object&& object) {
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// clang-format off
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if constexpr(count == 1) {
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auto&& [a] = object;
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return std::tuple{&a};
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} else if constexpr(count == 2) {
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auto&& [a, b] = object;
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return std::tuple{&a, &b};
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} else if constexpr(count == 3) {
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auto&& [a, b, c] = object;
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return std::tuple{&a, &b, &c};
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} else if constexpr(count == 4) {
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auto&& [a, b, c, d] = object;
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return std::tuple{&a, &b, &c, &d};
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} else if constexpr(count == 5) {
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auto&& [a, b, c, d, e] = object;
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return std::tuple{&a, &b, &c, &d, &e};
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} else if constexpr(count == 6) {
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auto&& [a, b, c, d, e, f] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f};
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} else if constexpr(count == 7) {
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auto&& [a, b, c, d, e, f, g] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g};
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} else if constexpr(count == 8) {
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auto&& [a, b, c, d, e, f, g, h] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h};
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} else if constexpr(count == 9) {
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auto&& [a, b, c, d, e, f, g, h, i] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i};
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} else if constexpr(count == 10) {
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auto&& [a, b, c, d, e, f, g, h, i, j] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j};
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} else if constexpr(count == 11) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k};
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} else if constexpr(count == 12) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l};
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} else if constexpr(count == 13) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m};
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} else if constexpr(count == 14) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n};
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} else if constexpr(count == 15) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o};
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} else if constexpr(count == 16) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p};
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} else if constexpr(count == 17) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q};
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} else if constexpr(count == 18) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r};
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} else if constexpr(count == 19) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s};
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} else if constexpr(count == 20) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t};
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} else if constexpr(count == 21) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u};
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} else if constexpr(count == 22) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v};
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} else if constexpr(count == 23) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w};
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} else if constexpr(count == 24) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x};
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} else if constexpr(count == 25) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y};
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} else if constexpr(count == 26) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z};
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} else if constexpr(count == 27) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _0] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z, &_0};
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} else if constexpr(count == 28) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _0, _1] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z, &_0, &_1};
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} else if constexpr(count == 29) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _0, _1, _2] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z, &_0, &_1, &_2};
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} else if constexpr(count == 30) {
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auto&& [a, b, c, d, e, f, g, h, i, j, k, l, m, n, o, p, q, r, s, t, u, v, w, x, y, z, _0, _1, _2, _3] = object;
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return std::tuple{&a, &b, &c, &d, &e, &f, &g, &h, &i, &j, &k, &l, &m, &n, &o, &p, &q, &r, &s, &t, &u, &v, &w, &x, &y, &z, &_0, &_1, &_2, &_3};
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} else {
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static_assert(count <= 30, "Not supported member count");
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}
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// clang-format on
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}
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template <typename T>
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struct Storage {
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inline static T value;
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};
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} // namespace clice::impl
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namespace clice {
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template <typename T>
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concept Reflectable = std::is_aggregate_v<std::decay_t<T>> && std::is_default_constructible_v<std::decay_t<T>>;
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template <Reflectable Object, typename Callback>
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constexpr void for_each(Object&& object, const Callback& callback) {
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using T = std::decay_t<Object>;
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constexpr auto count = impl::member_count<T>();
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auto members = impl::collcet_members<count>(object);
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constexpr auto static_members = impl::collcet_members<count>(impl::Storage<T>::value);
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[&]<std::size_t... Is>(std::index_sequence<Is...>) {
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(callback(impl::member_name<std::get<Is>(static_members)>(), *std::get<Is>(members)), ...);
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}(std::make_index_sequence<count>{});
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}
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}; // namespace clice
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