Function meta_ptr_compare

library/LuaWrapper.cpp:562–575

* Metamethod: compare two DF object references. * * Equal if same pointer and same metatable. */

 * Equal if same pointer and same metatable.
 */
static int meta_ptr_compare(lua_State *state)
{
    if (!lua_isuserdata(state, 1) || !lua_isuserdata(state, 2) ||
        !lua_getmetatable(state, 1) || !lua_getmetatable(state, 2) ||
        get_object_ref(state, 1) != get_object_ref(state, 2) ||
        !is_type_compatible(state, 3, 4, true))
    {
        lua_pushboolean(state, false);
        return 1;
    }

    lua_pushboolean(state, true);
    return 1;
}

/**
 * Method: sizeof for DF object references.