time.hpp

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// time.hpp
/*
 *  Copyright (c) 2018, 2020 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 <neolib/neolib.hpp>
#include <neolib/ecs/chrono.hpp>
#include <neolib/ecs/system.hpp>
#include <neolib/ecs/entity_life_span.hpp>
 
namespace neolib::ecs
{
    class NEOLIB_EXPORT time : public system<entity_info, entity_life_span>
    {
    private:
        class thread;
    public:
        time(i_ecs& aEcs);
    public:
        const system_id& id() const override;
        const neolib::i_string& name() const override;
    public:
        bool apply() override;
    public:
        step_time system_time() const;
        step_time world_time() const;
    public:
        struct meta
        {
            static const neolib::uuid& id()
            {
                static const neolib::uuid sId = { 0x714a0e4a, 0xd0be, 0x4737, 0xbd25, { 0xe8, 0x3e, 0x2a, 0x5c, 0xd7, 0x65 } };
                return sId;
            }
            static const neolib::i_string& name()
            {
                static const neolib::string sName = "Time";
                return sName;
            }
        };
    private:
        mutable optional_step_time iSystemTimeOffset;
    };
}