Question

#ifndef C_H
#define C_H
#include <memory>
class C
{
public:
    C(){};
    ~C() {};
};
typedef auto_ptr<C> CPtr;


#endif

The above codes seem fine for me, but when I compile them with VC10, I got the following errors:
“error C2143: syntax error : missing ‘;’ before ‘<‘”. Any ideas about it will be appreciated.

Answer 1

#include <memory> gives you auto_ptr in the std-namespace, so you could make this compile by replacing your typedef with:

typedef std::auto_ptr<C> CPtr;

Alternatively, you could introduce auto_ptr into the current namespace with a using statement, though you should really not do this in a header. To do this you would need to add a statement like using std::auto_ptr; or using namespace std;.