/*
 *
 * Official Python API
 *
 * Copyright (c) 2009-2022, quasardb SAS. All rights reserved.
 * 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.
 *    * Neither the name of quasardb nor the names of its contributors may
 *      be used to endorse or promote products derived from this software
 *      without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY QUASARDB AND CONTRIBUTORS ``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 REGENTS AND CONTRIBUTORS 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.
 */
#pragma once

#include "../handle.hpp"

namespace qdb
{

namespace detail
{

/**
 * Resource guard for QDB-native allocated resources. Automatically invokes
 * qdb_release() when the guard goes out of scope.
 */
template <typename ValueType>
class qdb_resource
{
public:
    /**
     * Default constructor, initializes nullpointer.
     */
    qdb_resource(qdb::handle_ptr h)
        : qdb_resource(h, nullptr)
    {}

    /**
     * Constructor and immediately initialize with pointer.
     */
    qdb_resource(qdb::handle_ptr h, ValueType * p)
        : h_(h)
        , p_(p)
    {}

    qdb_resource(qdb_resource const &) = delete;
    qdb_resource & operator=(qdb_resource const &) = delete;

    ~qdb_resource()
    {
        if (p_ != nullptr)
        {
            qdb_release(*h_, p_);
        }

        p_ = nullptr;
    }

    constexpr operator ValueType *() const
    {
        return get();
    }

    operator ValueType *()
    {
        return get();
    }

    ValueType * get()
    {
        return p_;
    }

    constexpr ValueType const * get() const
    {
        return p_;
    }

    ValueType ** operator&()
    {
        return &p_;
    }

    ValueType & operator*()
    {
        return *p_;
    }

    constexpr ValueType const & operator*() const
    {
        return *p_;
    }

private:
    qdb::handle_ptr h_;
    ValueType * p_;
};

} // namespace detail

} // namespace qdb
