key_from_key.h

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// Copyright (C) 2013-2024 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