Using STL containers in a header file

[rtzoeller]

Is it possible to use STL containers in a class's header file? Meaning, can I declare and then construct say, a queue in a class I am writing? How would I make sure that #include <queue> doesn't appear multiple times?

[LB]

Yes, you can. You don't need to make sure includes only appear once, because they all have include guards. Your headers have include guards too. Right?

[rtzoeller]

Yes. But this returns an error on the queue line:

#ifndef BASECARDGAME_H
#define BASECARDGAME_H
#include <queue>


class baseCardGame
{
    public:
        baseCardGame();
        virtual ~baseCardGame();
    protected:
    private:
    queue<int> deck;

};

#endif // BASECARDGAME_H 

[LB]

Because, like everything in the Standard Template Library, queue is in the std namespace, meaning you must either write std::queue, or put using namespace std; or using std::queue; at the top.

[rtzoeller]

Doh! Amazing how little things like that can make you frustrated for hours and someone else can take one look and it's done.