key_from_key.h

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// Copyright (C) 2013-2015 Internet Systems Consortium, Inc. ("ISC")
//
// This Source Code Form is subject to the terms of the Mozilla Public
// License, v. 2.0. If a copy of the MPL was not distributed with this
// file, You can obtain one at http://mozilla.org/MPL/2.0/.

#ifndef KEY_FROM_KEY_H
#define KEY_FROM_KEY_H

#include <functional>

namespace isc {
namespace dhcp {

template<typename KeyExtractor1, typename KeyExtractor2>
class KeyFromKeyExtractor {
public:
    typedef typename KeyExtractor1::result_type result_type;

    KeyFromKeyExtractor()
        : key1_(KeyExtractor1()), key2_(KeyExtractor2()) { };

    template<typename T>
    result_type operator() (T& arg) const {
        return (key1_(key2_(arg)));
    }
private:
    KeyExtractor1 key1_;
    KeyExtractor2 key2_;
};

} // end of isc::dhcp namespace
} // end of isc namespace

#endif // KEY_FROM_KEY_H