Article: Q115521
Product(s): Microsoft C Compiler
Version(s): 1.0,1.5,2.0,4.0,4.1,7.0
Operating System(s):
Keyword(s): kbtool kbCompiler kbCPPonly kbVC kbVC500fix
Last Modified: 11-FEB-2002
-------------------------------------------------------------------------------
The information in this article applies to:
- Microsoft C/C++ Compiler (CL.EXE), included with:
- Microsoft C/C++ for MS-DOS, version 7.0
- Microsoft Visual C++, versions 1.0, 1.5
- *EDITOR Please do not choose this product*Microsoft Visual C++ 32-bit Edition* use 241, 265, 225, versions 1.0, 2.0, 4.0, 4.1
-------------------------------------------------------------------------------
SYMPTOMS
========
After declaring the only copy constructor in a class with an access of
"private", the constructor is called when access should not be allowed. For
example, when an instance of the class is passed as a parameter to a function,
the copy constructor is used to initialize the parameter; this should be allowed
only if the function has "private" access.
STATUS
======
Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article. This bug was corrected in Visual C++ version 5.0.
MORE INFORMATION
================
The following sample code demonstrates this problem.
Sample Code
-----------
/* Compile options needed: none
*/
#include <iostream.h>
class aClass
{
private:
int i;
aClass(const aClass& x) { cout << "private copy constructor" <<
endl; };
public:
aClass(int j) : i(j) {};
};
int func(aClass x) { return 0; };
int main(void)
{
int n;
aClass a(1);
n = func(a); //Copy constructor gets called anyway.
return 0;
}
Additional query words: kbVC400bug 8.00 8.00c 9.00
======================================================================
Keywords : kbtool kbCompiler kbCPPonly kbVC kbVC500fix
Technology : kbVCsearch kbAudDeveloper kbCVCComp
Version : :1.0,1.5,2.0,4.0,4.1,7.0
Issue type : kbbug
Solution Type : kbfix
=============================================================================