Can I undo the effect of “using namespace” in C++?

Question

With using namespace I make the whole contents of that namespace directly visible without using the namespace qualifier. This can cause problems if using

Answer 1

The closest, that I'll try to use in header files is following:

//example.h

#ifndef EXAMPLE_H_
#define EXAMPLE_H_


/**
 * hating c++ for not having "undo" of using namespace xx
 */
#define string std::string
#define map std::map

class Example {
public:
    Example (const char *filename);
    Example (string filename);
    ~Example ();
private:
    map my_complicated_map;

};

#undef string
#undef map

#endif //EXAMPLE_H_

after all, defines are #undef -able. There are 2 problems: 1. it is ugly 2. separate #define and #undef for each name from the corresponding namespace are used