utility.hpp

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/*
 * This file is part of Algorithms library toolkit.
 * Copyright (C) 2017 Jan Travnicek (jan.travnicek@fit.cvut.cz)
 
 * Algorithms library toolkit is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 
 * Algorithms library toolkit 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 Algorithms library toolkit.  If not, see <http://www.gnu.org/licenses/>.
 */
 
#pragma once
 
#include <utility>
 
#include "type_traits.hpp"
 
#include <extensions/container/ptr_value.hpp>
 
namespace ext {
 
template < class T >
inline auto move_copy ( const T & param ) {
    if constexpr ( ext::has_clone < T >::value && ! std::is_final_v < T > ) {
        return ptr_value < T > ( param );
    } else {
        return T ( param );
    }
}
 
namespace detail {
 
template < class F, std::size_t ... Is >
void constexpr_switch ( const std::size_t i, F && f, std::index_sequence < Is ... > ) {
    [ ] ( ... ) { } (
        ( i == Is && ( ( void ) std::forward < F > ( f ) . operator ( ) ( std::integral_constant < size_t, Is > ( ) ), false ) ) ...
    );
}
 
} // namespace detail
 
template < std::size_t N, class F >
void constexpr_switch ( const std::size_t i, F && f ) {
    detail::constexpr_switch ( i, std::forward < F > ( f ), std::make_index_sequence < N > { } );
}
 
} /* namespace ext */