register.h

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#ifndef NNGN_LUA_REGISTER_H
#define NNGN_LUA_REGISTER_H
 
#include <vector>
 
#include "utils/pp.h"
 
#include "lua.h"
 
struct lua_State;
 
#define NNGN_LUA_PROXY(T, ...) \
    NNGN_OVERLOAD(NNGN_LUA_PROXY, T __VA_OPT__(,) __VA_ARGS__)
#define NNGN_LUA_PROXY(T, ...) \ …
#define NNGN_LUA_PROXY1(T) NNGN_LUA_PROXY2(T, [](auto){})
#define NNGN_LUA_PROXY2(T, f) \
    static auto NNGN_ANON() = nngn::lua::static_register{ \
        [](lua_State *nngn_L) { \
            [[maybe_unused]] const auto mark = nngn::lua::stack_mark(nngn_L); \
            (f)(nngn::lua::state_view{nngn_L}.new_user_type<T>()); \
        }, \
    };
#define NNGN_LUA_PROXY2(T, f) \ …
 
#define NNGN_LUA_DECLARE_USER_TYPE(T, ...) \
    NNGN_OVERLOAD(NNGN_LUA_DECLARE_USER_TYPE, T __VA_OPT__(,) __VA_ARGS__)
#define NNGN_LUA_DECLARE_USER_TYPE(T, ...) \ …
#define NNGN_LUA_DECLARE_USER_TYPE1(T) NNGN_LUA_DECLARE_USER_TYPE2(T, #T)
#define NNGN_LUA_DECLARE_USER_TYPE2(T, N) \
    template<> \
    inline constexpr auto nngn::lua::is_user_type<T> = true; \
    template<> \
    inline constexpr nngn::fixed_string nngn::lua::metatable_name<T> = N;
#define NNGN_LUA_DECLARE_USER_TYPE2(T, N) \ …
 
namespace nngn::lua {
 
class static_register {
public:
    using fn = void(lua_State*);
    static void register_all(lua_State *L);
    explicit static_register(fn *f) { registry().push_back(f); }
private:
    using V = std::vector<fn*>;
    static V &registry(void) { static V v; return v; }
};
class static_register {…};
 
}
 
#endif