How to get current seed from C++ rand()?

Question

I generate a few thousand object in my program based on the C++ rand() function. Keeping them in the memory would be exhaustive. Is there a way to copy the CURRENT

Answer 1

There's no standard way to obtain the current seed (you can only set it via srand), but you can reimplement rand() (which is usually a linear congruential generator) by yourself in a few lines of code:

class LCG
{
private:
    unsigned long next = 1;
public:

    LCG(unsigned long seed) : next(seed) {}

    const unsigned long rand_max = 32767

    int rand()
    {
        next = next * 1103515245 + 12345;
        return (unsigned int)(next/65536) % 32768;
    }

    void reseed(unsigned long seed)
    {
        next = seed;
    }

    unsigned long getseed()
    {
        return next;
    }
};