i_lifetime.hpp

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// i_lifetime.hpp
/*
 *  Copyright (c) 2007 Leigh Johnston.
 *
 *  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 Leigh Johnston nor the names of any
 *       other contributors to this software may be used to endorse or
 *       promote products derived from this software without specific prior
 *       written permission.
 *
 *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS 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 COPYRIGHT OWNER OR
 *  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 <stdexcept>
#include <memory>
#include <atomic>
#include <neolib/neolib.hpp>
 
namespace neolib
{
    class i_lifetime_flag
    {
    public:
        virtual ~i_lifetime_flag() = default;
    public:
        virtual bool is_creating() const = 0;
        virtual bool is_alive() const = 0;
        virtual bool is_destroying() const = 0;
        virtual bool is_destroyed() const = 0;
        virtual operator bool() const = 0;
    public:
        virtual bool debug() const = 0;
        virtual void set_debug(bool aDebug = true) = 0;
    };
 
    enum class lifetime_state
    {
        Creating,
        Alive,
        Destroying,
        Destroyed
    };
 
    class i_lifetime
    {
    public:
        struct not_creating : std::logic_error { not_creating() : std::logic_error("i_lifetime::not_creating") {} };
        struct already_destroyed : std::logic_error { already_destroyed() : std::logic_error("i_lifetime::already_destroyed") {} };
    public:
        virtual ~i_lifetime() = default;
    public:
        virtual lifetime_state object_state() const = 0;
        virtual std::shared_ptr<std::atomic<lifetime_state>> object_state_ptr() const = 0; // todo: not polymorphic; use ref_ptr?
        virtual bool is_creating() const = 0;
        virtual bool is_alive() const = 0;
        virtual bool is_destroying() const = 0;
        virtual bool is_destroyed() const = 0;
        virtual void set_alive() = 0;
        virtual void set_destroying() = 0;
        virtual void set_destroyed() = 0;
    };
}