istream and ostream not declared?

My program keeps saying istream and ostream are not declared when I'm trying to create this class:

Code:

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#include <iostream>


#ifndef TRANSPORT_H_
#define TRANSPORT_H_

class Transport{
      public:
            Transport();
            Transport(double cost);
            double get_cost() const;
            void set_cost(double c);
           
            virtual void output(ostream & outs) = 0;
            virtual void input(istream & ins) = 0;
     
      private:
            double cost;         
             
};

#endif

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as you can see im including iostream, i also tried ios, istream & ostream and none work... any ideas?
thanks

ummm nevermind im an idiot, its late and i forgot my namespace :rolleyes:

Or better, explicitly qualify them, since this appears to be a header. And if it is a header, put the entire contents of the file between the guards.

> ummm nevermind im an idiot, its late and i forgot my namespace
Putting namespace into header files is a good way to ........ off everyone who uses your header file, and doesn't want your choice of namespace.

Quote:

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Originally Posted by Salem

> ummm nevermind im an idiot, its late and i forgot my namespace
Putting namespace into header files is a good way to ........ off everyone who uses your header file, and doesn't want your choice of namespace.

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How else would you std::istream ;)