libcruft-util/variadic.hpp

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/*
* 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>
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*/
#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; }
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/// 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; }
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}
#endif