random_new_deterministic.hpp

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/*
   Copyright (C) 2014 - 2016 by David White <[email protected]>
   Part of the Battle for Wesnoth Project http://www.wesnoth.org/

   This program is free software; you can redistribute it and/or modify
   it under the terms of the GNU General Public License as published by
   the Free Software Foundation; either version 2 of the License, or
   (at your option) any later version.
   This program is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY.

   See the COPYING file for more details.
*/
#ifndef RANDOM_NEW_DETERMINISTIC_H_INCLUDED
#define RANDOM_NEW_DETERMINISTIC_H_INCLUDED
#include "random_new.hpp"
#include "mt_rng.hpp"

namespace random_new
{
    /**
        This rng is used when the normal synced rng is not available
        this is currently only he case at the very start of the scenario (random generation of starting units traits).

        or during the "Deterministic SP mode"
    */
    class rng_deterministic : public random_new::rng
    {
    public:
        rng_deterministic(rand_rng::mt_rng& gen);
        virtual ~rng_deterministic();

    protected:
        virtual uint32_t next_random_impl();
    private:
        rand_rng::mt_rng& generator_;
    };

    /**
        RAII class to use rng_deterministic in the current scope.
    */
    class set_random_determinstic
    {
    public:
        set_random_determinstic(rand_rng::mt_rng& rng);
        ~set_random_determinstic();
    private :
        rng* old_rng_;
        rng_deterministic new_rng_;
    };
}

#endif