libcruft-util/variadic.hpp

/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2017 Danny Robson <danny@nerdcruft.net>
 */

#ifndef __UTIL_VARIADIC_HPP
#define __UTIL_VARIADIC_HPP

namespace util::variadic {
    /// return a reference to the first item in a parameter pack
    template <typename T, typename ...Tail>
    T&
    first (T &t, Tail&&...)
    { return t; }


    /// return a reference to the first item in a const parameter pack
    template <typename T, typename ...Tail>
    const T&
    first (const T &t, const Tail&&...)
    { return t; }
}

#endif