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std::generate_canonical

STD：：生成[医]典范

Defined in header ​​
template< class RealType, size_t bits, class Generator > RealType generate_canonical( Generator& g ​(since C++11)

生成范围内的随机浮点数。[0；1%29。

为了产生足够的熵，generate_canonical()会打电话g()精确k次，其中k=max%281，b/log

2R%29和。

  • b =std::min<std::size_t>(bits,std::numeric_limits<RealType>::digits)

  • R = g.max() - g.min() + 1...

参数

g-generator to use to acquire entropy

返回值

浮点值在范围内。[0；1%29。

例外

除g...

注记

一些现有的实现有一个错误，它们可能偶尔会返回。1.0如果RealType是float海合会#63176LLVM#18767这是lwg第2524期

例

产生具有10位随机性的随机数：这可能只产生k。%2Ar不同的值。

二次

#include <random>
#include <iostream>
 
int main()
{
    std::random_device rd;
    std::mt19937 gen(rd()
    for(int n=0; n<10; ++n) {
        std::cout << std::generate_canonical<double, 10>(gen) << ' ';
    }
}

二次

产出：

二次

0.208143 0.824147 0.0278604 0.343183 0.0173263 0.864057 0.647037 0.539467 0.0583497 0.609219

二次

另见

uniform_real_distribution (C++11)produces real values evenly distributed across a range (class template)

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