Which is better in C++ header files, #pragma once OR #ifndef - endif directives?

Question

As of VC++ 2005, which is better. Thnx. As i undestand, if I am using only windows, i can use pragma else use ifndef?

Answer 1

#pragma is windows' way of handling things. use #ifndef is better for actual software development.

Answer 2

#pragma once is supported by only a small number of C++ compilers. What the previous poster was trying to say is that your code will not be portable unless you're using the other method:

#ifndef _SUFFICIENTLY_UNIQUE_CODE
#define _SUFFICIENTLY_UNIQUE_CODE


#endif

But, of course, the above is more error prone.