std::uniform_real_distribution
Defined in header <random> | ? | ? |
|---|---|---|
template< class RealType = double > class uniform_real_distribution; | ? | (since C++11) |
产生随机浮点值i，在区间上均匀分布。[a, b)，即按概率函数分布：p%28 i a，b%29=。
一
*。
B-a
...
std::uniform_real_distribution满足…的所有要求RandomNumberDistribution...
模板参数
RealType | - | The result type generated by the generator. The effect is undefined if this is not one of float, double, or long double. |
|---|
成员类型
Member type | Definition |
|---|---|
result_type | RealType |
param_type | the type of the parameter set, see RandomNumberDistribution. |
成员函数
(constructor) | constructs new distribution (public member function) |
|---|---|
reset | resets the internal state of the distribution (public member function) |
世代
运算符%28%29在分布%28公共成员函数%29中生成下一个随机数。
特征
AB返回分布参数%28公共成员函数%29
Param获取或设置分布参数对象%28公共成员函数%29
min返回最小潜在生成值%28公共成员函数%29
MAX返回最大潜在生成值%28公共成员函数%29
非会员职能
operator==operator!= | compares two distribution objects (function) |
|---|---|
operator<<operator>> | performs stream input and output on pseudo-random number distribution (function template) |
注记
一些现有的实现有一个错误，它们可能偶尔返回b，如果RealType是float海合会#63176LLVM#18767这是由lwg第2524期
例
在1到2之间打印10个随机数。
二次
#include <random>
#include <iostream>
int main()
{
std::random_device rd; //Will be used to obtain a seed for the random number engine
std::mt19937 gen(rd()); //Standard mersenne_twister_engine seeded with rd()
std::uniform_real_distribution<> dis(1, 2);
for (int n = 0; n < 10; ++n) {
//Use dis to transform the random unsigned int generated by gen into a double in [1, 2)
std::cout << dis(gen) << ' '; //Each call to dis(gen) generates a new random double
}
std::cout << '\n';
}二次
可能的产出：
二次
1.80829 1.15391 1.18483 1.38969 1.36094 1.0648 1.97798 1.27984 1.68261 1.57326二次
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