return_literal_function.hh

/* vim: set sw=4 sts=4 et foldmethod=syntax : */
 
/*
 * Copyright (c) 2009 Ciaran McCreesh
 *
 * This file is part of the Paludis package manager. Paludis is free software;
 * you can redistribute it and/or modify it under the terms of the GNU General
 * Public License version 2, as published by the Free Software Foundation.
 *
 * Paludis is distributed in the hope that it will be useful, but WITHOUT ANY
 * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
 * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for more
 * details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place, Suite 330, Boston, MA  02111-1307  USA
 */
 
#ifndef PALUDIS_GUARD_PALUDIS_UTIL_RETURN_LITERAL_FUNCTION_HH
#define PALUDIS_GUARD_PALUDIS_UTIL_RETURN_LITERAL_FUNCTION_HH 1
 
#include <paludis/util/return_literal_function-fwd.hh>
 
namespace paludis
{
    template <typename T_>
    struct ReturnLiteralFunction
    {
        const T_ value;
 
        const T_ operator() () const PALUDIS_ATTRIBUTE((warn_unused_result))
        {
            return value;
        }
 
        ReturnLiteralFunction(const T_ & v) :
            value(v)
        {
        }
    };
 
    template <typename T_>
    std::function<T_ ()> return_literal_function(const T_ & v)
    {
        return ReturnLiteralFunction<T_>(v);
    }
}
 
#endif