axmol/core/base/Random.h

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/****************************************************************************
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2013-2016 Chukong Technologies Inc.
Copyright (c) 2017-2018 Xiamen Yaji Software Co., Ltd.
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https://axmolengine.github.io/
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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.
****************************************************************************/
#ifndef __ccRandom_H_
#define __ccRandom_H_
#include <random>
#include <cstdlib>
#include "platform/PlatformConfig.h"
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/**
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* @addtogroup base
* @{
*/
NS_AX_BEGIN
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#define AX_RAND_MAX 2147483647
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/**
* @class RandomHelper
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* @brief A helper class for creating device dependent random number
* @remark
* Random Generator: std::mt19937 32bit
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*/
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class AX_DLL RandomHelper
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{
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public:
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template <typename T>
static T random_real(T min, T max)
{
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std::uniform_real_distribution<T> dist(min, max);
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auto& mt = RandomHelper::getEngine();
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return dist(mt);
}
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template <typename T>
static T random_int(T min, T max)
{
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std::uniform_int_distribution<T> dist(min, max);
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auto& mt = RandomHelper::getEngine();
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return dist(mt);
}
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private:
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static std::mt19937& getEngine();
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};
/**
* Returns a random value between `min` and `max`.
*/
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template <typename T>
inline T random(T min, T max)
{
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return RandomHelper::random_int<T>(min, max);
}
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template <>
inline float random(float min, float max)
{
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return RandomHelper::random_real(min, max);
}
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template <>
inline long double random(long double min, long double max)
{
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return RandomHelper::random_real(min, max);
}
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template <>
inline double random(double min, double max)
{
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return RandomHelper::random_real(min, max);
}
/**
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* Returns a random int between 0 and AX_RAND_MAX.
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*/
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inline int random()
{
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return ax::random(0, AX_RAND_MAX);
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};
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/// Follow random APIs is device independent, need set seed by std::srand
/// DEPRECATED: use FastRGN.h or c++11 'std::minstd_rand' or 'std::minstd_rand0' instead
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/**
* Returns a random float between -1 and 1.
* It can be seeded using std::srand(seed);
*/
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inline float rand_minus1_1()
{
return ((std::rand() / (float)RAND_MAX) * 2) - 1;
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}
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/**
* Returns a random float between 0 and 1.
* It can be seeded using std::srand(seed);
*/
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inline float rand_0_1()
{
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return std::rand() / (float)RAND_MAX;
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}
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NS_AX_END
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// end group
/// @}
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#endif //__ccRandom_H_