Random.h

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// Random.h
//
// Copyright (c) 2016 Michael Imamura.
//
// Licensed under GrokkSoft HoverRace SourceCode License v1.0(the "License");
// you may not use this file except in compliance with the License.
//
// A copy of the license should have been attached to the package from which
// you have taken this file. If you can not find the license you can not use
// this file.
//
//
// The author makes no representations about the suitability of
// this software for any purpose.  It is provided "as is" "AS IS",
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
// implied.
//
// See the License for the specific language governing permissions
// and limitations under the License.

#pragma once

#include <random>

#if defined(_WIN32) && defined(HR_ENGINE_SHARED)
#   ifdef MR_ENGINE
#       define MR_DllDeclare   __declspec( dllexport )
#   else
#       define MR_DllDeclare   __declspec( dllimport )
#   endif
#else
#   define MR_DllDeclare
#endif

namespace HoverRace {
namespace Util {

class MR_DllDeclare RandSource : public std::mt19937
{
    using SUPER = std::mt19937;

public:
    RandSource();

public:
    static RandSource &ForThread();
};

template<class T>
class RandomInt
{
public:
    RandomInt(T min, T max) :
        dist(min, max), src(RandSource::ForThread()) { }

public:
    T operator()() { return dist(src); }

private:
    std::uniform_int_distribution<T> dist;
    RandSource &src;
};

}  // namespace Util
}  // namespace HoverRace

#undef MR_DllDeclare