/*
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Copyright 2015-2017 Danny Robson <danny@nerdcruft.net>
 */

#ifndef CRUFT_UTIL_ALLOC_RAW_FALLBACK_HPP
#define CRUFT_UTIL_ALLOC_RAW_FALLBACK_HPP

#include "../../view.hpp"

#include <cstddef>
#include <tuple>

namespace util::alloc::raw {
    /// A raw memory allocator that allocates memory series of child
    /// allocators, preferring earlier allocators.
    template <typename ...ChildT>
    class fallback {
    public:
        fallback (ChildT &..._children):
            m_children (_children...)
        { ; }

        template <typename T>
        util::view<T*>
        allocate (size_t bytes);

        template <typename T>
        util::view<T*>
        allocate (size_t bytes, size_t align);

        template <typename T>
        void deallocate (util::view<std::byte*> ptr);

    private:
        std::tuple<ChildT&...> m_children;
    };
}

#endif