stack

[The suffocated]

Hello everyone. I'm now writing a code that does some actions with a stack. Actually it's ok, but I have a problem here. I have a stack and I need to copy its elements to another one missing the repeated elements.The problem is that I have to use the pop function and I distort the stack. I can't write the function properly.
Could you please help me by showing the right way or giving some hints. Any help will be appreciated. Thanks in advance.

[SamuelAdams]

double post
http://www.cplusplus.com/forum/general/175197/

[The suffocated]

but none of them was answered