126 lines
3.2 KiB
C++
126 lines
3.2 KiB
C++
// 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
|
|
{
|
|
//
|
|
// 随机数
|
|
//
|
|
// 获取指定范围内的一个随机数, 如:
|
|
// Int32 n = math::Rand(1, 5); // 获取 1~5 内的随机整数, 包含 1 和 5
|
|
// 产生的随机数类型取决于参数的类型, 如获取随机浮点数:
|
|
// Float64 d = math::Rand(1.2, 1.5);
|
|
//
|
|
|
|
Int32 Rand(Int32 min, Int32 max);
|
|
|
|
UInt32 Rand(UInt32 min, UInt32 max);
|
|
|
|
long Rand(long min, long max);
|
|
|
|
unsigned long Rand(unsigned long min, unsigned long max);
|
|
|
|
char Rand(char min, char max);
|
|
|
|
UChar Rand(UChar min, UChar max);
|
|
|
|
Float32 Rand(Float32 min, Float32 max);
|
|
|
|
Float64 Rand(Float64 min, Float64 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());
|
|
}
|
|
}
|
|
|
|
inline Int32 Rand(Int32 min, Int32 max)
|
|
{
|
|
return __rand_detail::RandomInt(min, max);
|
|
}
|
|
|
|
inline UInt32 Rand(UInt32 min, UInt32 max)
|
|
{
|
|
return __rand_detail::RandomInt(min, max);
|
|
}
|
|
|
|
inline long Rand(long min, long max)
|
|
{
|
|
return __rand_detail::RandomInt(min, max);
|
|
}
|
|
|
|
inline unsigned long Rand(unsigned long min, unsigned long max)
|
|
{
|
|
return __rand_detail::RandomInt(min, max);
|
|
}
|
|
|
|
inline char Rand(char min, char max)
|
|
{
|
|
return static_cast<char>(
|
|
__rand_detail::RandomInt(static_cast<Int32>(min), static_cast<Int32>(max))
|
|
);
|
|
}
|
|
|
|
inline UChar Rand(UChar min, UChar max)
|
|
{
|
|
return static_cast<UChar>(
|
|
__rand_detail::RandomInt(static_cast<UInt32>(min), static_cast<UInt32>(max))
|
|
);
|
|
}
|
|
|
|
inline Float32 Rand(Float32 min, Float32 max)
|
|
{
|
|
return __rand_detail::RandomReal(min, max);
|
|
}
|
|
|
|
inline Float64 Rand(Float64 min, Float64 max)
|
|
{
|
|
return __rand_detail::RandomReal(min, max);
|
|
}
|
|
}
|
|
} |