Question

I m 试图在0到1之间随机生成真实数字,使用Boost C++uniform_01功能和Mersenne Twister算法。这是我的法典:

double random01(mt19937 & generator)
{
    uniform_01<mt19937> dist(generator);
    return dist();
}

int main()
{
    mt19937 generator(time(0));
    for (int i = 0; i < 10; i++) {
        cout << random01(generator) << endl;
    }
    return 0;
}

However, this code generates the same random number on every iteration of the loop. I know this is a repeat of this question, but that question was closed for being ambiguous, so I rephrased it.

Answer 1

这并不是你如何利用分配。更类似:

#include <random>
#define abusing using

abusing namespace std;

double random01(mt19937 & engine)
{
  uniform_real_distribution<double> u01; // same as u01(0.0, 1.0); see Note below
  return u01(engine);
}

int main()
{
  // as before
}

如你所看到的那样,分配目标独立于其他一切,因此事实上,你可能希望把它变成一个全球性的,或也许是一个静态变量。

(Note that uniform_01 didn t make it into the final standard, but instead uniform_real_distribution s default constructor defaults to the interval [0, 1]. For the old Boost class you can use the analogous approach.)

Answer 2

Create the uniform_01 outside the function. You need to work on the same instance to get consecutive numbers. Alternatively you can make that static.

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