#define SOL_ALL_SAFETIES_ON 1 #include #include struct object { int value = 0; }; int main(int, char*[]) { std::cout << "=== runtime_additions ===" << std::endl; sol::state lua; lua.open_libraries(sol::lib::base); lua.new_usertype("object"); // runtime additions: through the sol API lua["object"]["func"] = [](object& o) { ++o.value; return o.value; }; // runtime additions: through a lua script lua.script(R"( function object:print () print(self:func()) end )"); // see it work lua.script(R"( obj = object.new() obj:print() )"); object& obj = lua["obj"]; sol_c_assert(obj.value == 1); return 0; }