126 lines
3.3 KiB
C++
126 lines
3.3 KiB
C++
// Copyright (c) 2016-2018 Easy2D - Nomango
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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//
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// The above copyright notice and this permission notice shall be included in
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// all copies or substantial portions of the Software.
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//
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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// THE SOFTWARE.
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#pragma once
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#include <random>
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namespace easy2d
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{
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namespace math
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{
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//
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// 随机数
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//
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// 获取指定范围内的一个随机数, 如:
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// int n = math::Rand(1, 5); // 获取 1~5 内的随机整数, 包含 1 和 5
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// 产生的随机数类型取决于参数的类型, 如获取随机浮点数:
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// double d = math::Rand(1.2, 1.5);
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//
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int Rand(int min, int max);
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unsigned int Rand(unsigned int min, unsigned int max);
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long Rand(long min, long max);
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unsigned long Rand(unsigned long min, unsigned long max);
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char Rand(char min, char max);
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unsigned char Rand(unsigned char min, unsigned char max);
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float Rand(float min, float max);
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double Rand(double min, double max);
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//
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// Details of math::Rand
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//
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namespace __rand_detail
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{
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inline std::default_random_engine& GetRandomEngine()
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{
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static std::random_device device;
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static std::default_random_engine engine(device());
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return engine;
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}
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template<typename T>
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inline T RandomInt(T min, T max)
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{
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std::uniform_int_distribution<T> dist(min, max);
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return dist(GetRandomEngine());
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}
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template<typename T>
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inline T RandomReal(T min, T max)
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{
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std::uniform_real_distribution<T> dist(min, max);
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return dist(GetRandomEngine());
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}
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}
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inline int Rand(int min, int max)
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{
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return __rand_detail::RandomInt(min, max);
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}
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inline unsigned int Rand(unsigned int min, unsigned int max)
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{
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return __rand_detail::RandomInt(min, max);
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}
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inline long Rand(long min, long max)
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{
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return __rand_detail::RandomInt(min, max);
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}
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inline unsigned long Rand(unsigned long min, unsigned long max)
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{
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return __rand_detail::RandomInt(min, max);
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}
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inline char Rand(char min, char max)
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{
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return static_cast<char>(
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__rand_detail::RandomInt(static_cast<int>(min), static_cast<int>(max))
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);
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}
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inline unsigned char Rand(unsigned char min, unsigned char max)
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{
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return static_cast<unsigned char>(
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__rand_detail::RandomInt(static_cast<unsigned int>(min), static_cast<unsigned int>(max))
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);
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}
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inline float Rand(float min, float max)
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{
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return __rand_detail::RandomReal(min, max);
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}
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inline double Rand(double min, double max)
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{
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return __rand_detail::RandomReal(min, max);
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}
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}
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} |