What do I need to include in my header file for ostream

When I try to compile my program the compiler complains about this line in a .h file that I #included.

ostream & Print (ostream & stream);

Ho开发者_如何转开发w can this be fixed?

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If you #include <ostream>, ostream will be defined in the std namespace:

#include <ostream>

// ...

std::ostream & Print (std::ostream & stream);

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Use 'using' if you don't want to pull the whole std namespace, eg :

#include <iosfwd>
using std::ostream;

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Minimal code for this declaration to compile:

#include <iosfwd>
using namespace std;