copy_n in GNU C++ Library

Hi,
I am using copy_n from GNU C++ Library under Ubuntu 8.10. My code is like this:

Code:

---

#include <ext/algorithm>
using namespace std;
void myfun(char * flags ) {
    char * flags_new = new char[3];
    copy_n(flags, 3, flags_new);
    delete [] flags_new;
  }

int main()
{
    char flags[3]={'a','b','c'};
    myfun(flags );
    return 0;
}

---

I got error : "‘copy_n’ was not declared in this scope".

I was wondring what is the problem and how to fix it? Thanks!

Looks non-standard to me. At any rate, you can just use:

Code:

---

std::copy(flags, flags + 3, flags_new);

---

For copy, what to include?
How do you find the header given a function in GNU standard C++ library?

There are C++ standard library references all over the net. Remember: It's a good idea to *always* aquire good documentation for any API you're working with. It should provide you with details such as any header files required, usage, pre-/post-conditions, constraints, etc...