如何在 C++ 中生成随机数使用<随机>标题成员？

发布于 2024-09-24 01:39:08 字数 781 浏览 8 评论 0原文

我学会了用 C# 编程，并开始学习 C++。我正在使用 Visual Studio 2010 IDE。我正在尝试使用中提供的分布类生成随机数。例如，我尝试执行以下操作：

    #include <random>
std::normal_distribution<double> *normal = new normal_distribution<double>(0.0, 0.0);
std::knuth_b *engine = new knuth_b();
std::variate_generator<knuth_b, normal_distribution<double>> *rnd;  
rnd = new variate_generator<knuth_b, normal_distribution<double>>(engine, normal);

最后一行给出编译器错误： IntelliSense：构造函数“std::tr1::variate_generator<_Engine, _Distrib>::variate_generator [with _Engine=std::tr1::knuth_b, _Distrib=std::tr1::normal_distribution]”没有实例与参数列表

匹配我觉得争论没问题，我做错了什么？当实例化这里的variate_generator类时，你调用哪个方法来获取下一个随机数，即.NET的System.Random.Next()？

原文

I learned to program in C# and have started to learn C++. I'm using the Visual Studio 2010 IDE. I am trying to generate random numbers with the distribution classes available in <random>. For example I tried doing the following:

    #include <random>
std::normal_distribution<double> *normal = new normal_distribution<double>(0.0, 0.0);
std::knuth_b *engine = new knuth_b();
std::variate_generator<knuth_b, normal_distribution<double>> *rnd;  
rnd = new variate_generator<knuth_b, normal_distribution<double>>(engine, normal);

The last line gives a compiler error:
IntelliSense: no instance of constructor "std::tr1::variate_generator<_Engine, _Distrib>::variate_generator [with _Engine=std::tr1::knuth_b, _Distrib=std::tr1::normal_distribution]" matches the argument list

My arguments look ok to me, what am I doing wrong? When the variate_generator class here is instantiated, which method do you call to get the next random number i.e. .NET's System.Random.Next()?

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挽袖吟 2024-10-01 01:39:08

C++0x 中没有 variate_generator，但 std::bind 也可以工作。以下代码在 GCC 4.5.2 和 MSVC 2010 Express 中编译并运行：

#include <random>
#include <functional>
#include <iostream>
int main()
{
    std::normal_distribution<> normal(10.0, 3.0); // mean 10, sigma 3
    std::random_device rd;
    std::mt19937 engine(rd()); // knuth_b fails in MSVC2010, but compiles in GCC
    std::function<double()> rnd = std::bind(normal, engine);

    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
}

PS：尽可能避免 new 。

There is no variate_generator in C++0x, but std::bind works just as well. The following compiles and runs in GCC 4.5.2 and MSVC 2010 Express:

#include <random>
#include <functional>
#include <iostream>
int main()
{
    std::normal_distribution<> normal(10.0, 3.0); // mean 10, sigma 3
    std::random_device rd;
    std::mt19937 engine(rd()); // knuth_b fails in MSVC2010, but compiles in GCC
    std::function<double()> rnd = std::bind(normal, engine);

    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
    std::cout << rnd() << '\n';
}

PS: avoid new when you can.

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