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root/uspace/lib/cpp/include/__bits/type_transformation.hpp

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/*
 * Copyright (c) 2018 Jaroslav Jindrak
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * - Redistributions of source code must retain the above copyright
 *   notice, this list of conditions and the following disclaimer.
 * - Redistributions in binary form must reproduce the above copyright
 *   notice, this list of conditions and the following disclaimer in the
 *   documentation and/or other materials provided with the distribution.
 * - The name of the author may not be used to endorse or promote products
 *   derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

#ifndef LIBCPP_BITS_TYPE_TRANSFORMATION
#define LIBCPP_BITS_TYPE_TRANSFORMATION

#include <__bits/aux.hpp>
#include <type_traits>

namespace std
{
    template<class>
    class reference_wrapper;
}

namespace std::aux
{
    /**
     * Used by tuple to decay reference wrappers to references
     * in make_tuple.
     */

    template<class T>
    struct remove_reference_wrapper: type_is<T>
    { /* DUMMY BODY */ };

    template<class T>
    struct remove_reference_wrapper<reference_wrapper<T>>: type_is<T&>
    { /* DUMMY BODY */ };

    template<class T>
    using remove_reference_wrapper_t = typename remove_reference_wrapper<T>::type;

    template<class T>
    using transform_tuple_types_t = remove_reference_wrapper_t<decay_t<T>>;
}

#endif