Function lua_new_Parameter

libraries/AP_Scripting/AP_Scripting_helpers.cpp:11–38

Custom lua constructor with optional param name

// Custom lua constructor with optional param name
int lua_new_Parameter(lua_State *L) {

    const int args = lua_gettop(L);
    if (args > 1) {
        return luaL_argerror(L, args, "too many arguments");
    }
    const char * name = nullptr;
    if (args == 1) {
        name = luaL_checkstring(L, 1);
    }

    // This chunk is the same as the auto generated constructor
    void *ud = lua_newuserdata(L, sizeof(Parameter));
    new (ud) Parameter();
    luaL_getmetatable(L, "Parameter");
    lua_setmetatable(L, -2);

    if (args == 0) {
        // no arguments, nothing to do
        return 1;
    }

    if (!static_cast<Parameter*>(ud)->init(name)) {
        return luaL_error(L, "No parameter: %s", name);
    }

    return 1;
}

// init by name
bool Parameter::init(const char *name)