std::generate algorithm

[subdene]

Hi All,

I have just been having a mess around with the function call operator and the generate algorithm. When I first saw the output of this which is:

0 1 2 3 4 5 6 7 8 9

#include "stdafx.h"
#include <iostream>
#include <algorithm>
#include <iterator>

struct g
{
        g()
	{
		n = 0;
	}
       
	int operator()() 
	{ 
		return n++; 
	}
        int n;
};

int main()
{
        int a[10];
	int size = (sizeof(a) / sizeof(a[0]));
        std::generate(a, a + size, g());
        std::copy(a, a+10, std::ostream_iterator<int>(std::cout, " "));
	getchar();
}

My natural instinct was to think that this would be 0 0 0 0 0 0 etc...
However, it looks like the implementation of the generate algorithm creates only one instance of type g, then uses that same instance for subsequent iterations. Is this correct?

Thanks

[anon]

It uses the instance you pass to it.