种子随机从毫秒在Windows和Linux [英] Seed random from milliseconds in Windows and Linux

问题描述

我需要种子的随机数生成器boost（从一个int加载）几个进程，对于一个程序，必须在Windows和Linux中编译和工作。

I need to seed the random number generator in boost (which is loaded from an int) for a few processes, for a program that has to compile and work both in Windows and in Linux.

我使用 std：time（0），但是因为这些进程是同时运行的作业，其中一些将在同一秒钟运行，产生相同的结果。

I used std:time(0), which worked, but since the processes are jobs which are run simultaneously, some of them would run at the same second, producing the same results.

所以我需要种子从毫秒，或任何其他跨平台随机生成器物。我尝试了 clock（）但不能使它从 time_t 转换为int。

So I need to seed it from milliseconds, or any other cross-platform random generator for that matter. I tried clock() but couldn't quite make it convert from time_t to int.

感谢。

推荐答案

如果您从单个脚本启动所有作业。

If you are starting all the jobs from a single script.

然后，您可以在命令行上传递一个递增的数字作为参数。每个作业然后将此值添加到time（）的结果以生成其种子。

Then you could pass an incremented number as an argument on the command line. Each Job then adds this value to the result of time() to generate its seed.

注意：我没有看到OP中有关安全性的任何要求。 >
原始代码使用时间（NULL），这将有一个可猜的种子。

Note: I don't see any requirement in the OP about security.
The original code is using time(NULL) and this will has a guessable seed.

int main(int argc,char* argv[])
{
    srand(time(NULL) + boost::lexical_cast<int>(argv[1]));

    // STUFF
}

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