/*******************************************************************************
 *
 * MIT License
 *
 * Copyright (c) 2017 Advanced Micro Devices, Inc.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 *
 *******************************************************************************/
#ifndef GUARD_MIOPEN_MANAGE_PTR_HPP
#define GUARD_MIOPEN_MANAGE_PTR_HPP

#include <memory>
#include <type_traits>

namespace miopen {

template <class F, F f>
struct manage_deleter
{
    template <class T>
    void operator()(T* x) const
    {
        if(x != nullptr)
        {
            f(x);
        }
    }
};

struct null_deleter
{
    template <class T>
    void operator()(T* /*x*/) const
    {
    }
};

template <class T, class F, F f>
using manage_ptr = std::unique_ptr<T, manage_deleter<F, f>>;

template <class T>
struct element_type
{
    using type = typename T::element_type;
};

template <class T>
using remove_ptr = typename std::conditional<std::is_pointer<T>::value,
                                             std::remove_pointer<T>,
                                             element_type<T>>::type::type;

template <class T>
using shared = std::shared_ptr<remove_ptr<T>>;

} // namespace miopen

#define MIOPEN_MANAGE_PTR(T, F) \
    miopen::manage_ptr<typename std::remove_pointer<T>::type, decltype(&F), &F> // NOLINT

#endif