Magic_Game/src/kiwano/math/Random.h

// Copyright (c) 2016-2018 Kiwano - Nomango
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#pragma once
#include <random>

namespace kiwano
{
namespace math
{
//
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD>
//
// <20><>ȡָ<C8A1><D6B8><EFBFBD><EFBFBD>Χ<EFBFBD>ڵ<EFBFBD>һ<EFBFBD><D2BB><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><>:
// int n = math::Random(1, 5);  // <20><>ȡ 1~5 <20>ڵ<EFBFBD><DAB5><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD> 1 <20><> 5
// <20><><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD>ڲ<EFBFBD><DAB2><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>, <20><><EFBFBD><EFBFBD>ȡ<EFBFBD><C8A1><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD><EFBFBD>:
// float d = math::Random(1.2f, 1.5f);
//

int Random(int min, int max);

unsigned int Random(unsigned int min, unsigned int max);

long Random(long min, long max);

unsigned long Random(unsigned long min, unsigned long max);

char Random(char min, char max);

float Random(float min, float max);

double Random(double min, double max);

//
// Details of math::Rand
//

namespace __rand_detail
{
inline std::default_random_engine& GetRandomEngine()
{
    static std::random_device         device;
    static std::default_random_engine engine(device());
    return engine;
}

template <typename T>
inline T RandomInt(T min, T max)
{
    std::uniform_int_distribution<T> dist(min, max);
    return dist(GetRandomEngine());
}

template <typename T>
inline T RandomReal(T min, T max)
{
    std::uniform_real_distribution<T> dist(min, max);
    return dist(GetRandomEngine());
}
}  // namespace __rand_detail

inline int Random(int min, int max)
{
    return __rand_detail::RandomInt(min, max);
}

inline unsigned int Random(unsigned int min, unsigned int max)
{
    return __rand_detail::RandomInt(min, max);
}

inline long Random(long min, long max)
{
    return __rand_detail::RandomInt(min, max);
}

inline unsigned long Random(unsigned long min, unsigned long max)
{
    return __rand_detail::RandomInt(min, max);
}

inline char Random(char min, char max)
{
    return static_cast<char>(__rand_detail::RandomInt(static_cast<int>(min), static_cast<int>(max)));
}

inline float Random(float min, float max)
{
    return __rand_detail::RandomReal(min, max);
}

inline double Random(double min, double max)
{
    return __rand_detail::RandomReal(min, max);
}
}  // namespace math
}  // namespace kiwano