STL error - with declaration move to other .h file, please help.

[vgrigor3]

In .cpp file I write:

#include "file.h"
#include <map>; 
using namespace std; 

class CPartHolder; 

typedef map<int,CPartHolder*> type_MapPartHolder; 
type_MapPartHolder mapPartHolder; 

class CPartHolder 
{ 
};

works fine
but if I move or add
declarations:

file.h :

#include <map>; 
using namespace std;

into .h file
appeared STL error
"operator new not defined for...."

What is the reason of this and gow to resolve
such a problem?

Thanks

[pim42]

Well I don't know much about C++ or STL ... basically just what people have taught me here. But I do know that you aren't suppose to have a "using namespace ..." in a header file. Instead write a "using" for each command you use, in your case "using std::map".

Also did you include the .h in the .cpp?

[vgrigor3]

Your advice - not works.

[Yves M]

In a header file, you should not use "using namespace std;", since otherwise all files which include this header will become "polluted" with the std namespace. But this seems not to be the problem here. Can you post a short succint, but compilable version of your .cpp and .h files that exhibit the problem ?

[Graham]

When you moved the statements to the .h file, did you include that .h in the original .cpp?

[vgrigor3]

I included .h file to the .cpp.

But I made it working by only making additional separate .h file
for map processing class and map definition.

reason for original error still not found by me.