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/* vim: set sw=4 sts=4 et foldmethod=syntax : */

/*
 * Copyright (c) 2008, 2010, 2011 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_FILTERED_GENERATOR_HH
#define PALUDIS_GUARD_PALUDIS_FILTERED_GENERATOR_HH 1

#include <paludis/filtered_generator-fwd.hh>
#include <paludis/util/pimp.hh>
#include <paludis/filter-fwd.hh>
#include <paludis/generator-fwd.hh>

/** \file
 * Declarations for the FilteredGenerator class.
 *
 * \ingroup g_selections
 *
 * \section Examples
 *
 * - \ref example_selection.cc "example_selection.cc"
 */

namespace paludis
{
    /**
     * A FilteredGenerator specifies a desired set of properties for PackageIDs
     * to be returned by Environment::operator[].
     *
     * Most Selection subclasses take a single FilteredGenerator as a parameter.
     *
     * \ingroup g_selections
     */
    class PALUDIS_VISIBLE FilteredGenerator
    {
        private:
            Pimp<FilteredGenerator> _imp;

        public:
            ///\name Basic operations
            ///\{

            FilteredGenerator(const FilteredGenerator &);
            FilteredGenerator(const Generator &, const Filter &);
            FilteredGenerator(const FilteredGenerator &, const Filter &);
            FilteredGenerator & operator= (const FilteredGenerator &);
            ~FilteredGenerator();

            ///\}

            /**
             * Return our Generator.
             */
            const Generator & generator() const PALUDIS_ATTRIBUTE((warn_unused_result));

            /**
             * Return our Filter.
             */
            const Filter & filter() const PALUDIS_ATTRIBUTE((warn_unused_result));
    };

    extern template class Pimp<FilteredGenerator>;
}

#endif