#define SOL_ALL_SAFETIES_ON 1 #include int main() { sol::state lua; lua.set_function( "bark", [](sol::this_state s, int a, int b) { lua_State* L = s; // current state return a + b + lua_gettop(L); }); lua.script( "first = bark(2, 2)"); // only takes 2 arguments, NOT 3 // Can be at the end, too, or in the middle: doesn't matter lua.set_function( "bark", [](int a, int b, sol::this_state s) { lua_State* L = s; // current state return a + b + lua_gettop(L); }); lua.script("second = bark(2, 2)"); // only takes 2 arguments int first = lua["first"]; sol_c_assert(first == 6); int second = lua["second"]; sol_c_assert(second == 6); return 0; }