Microsoft KB Archive/172980

= FIX: Compiler Incorrectly Causes Default Constructor Reference =

Article ID: 172980

Article Last Modified on 7/5/2005

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APPLIES TO


 * Microsoft Visual C++ 5.0 Enterprise Edition
 * Microsoft Visual C++ 5.0 Professional Edition

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This article was previously published under Q172980



SYMPTOMS
When instantiating a class template with a member function that has a default parameter, error C2512 may be generated.



CAUSE
This behavior can occur when the default parameter is an explicitly-created temporary of the parameterized type of the template. The sample code below demonstrates this.



RESOLUTION
Do not use an explicitly-generated temporary as a default argument.

-or-

Ensure that the template argument has a default constructor available.



STATUS
Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This bug has been fixed in Visual Studio 97 Service Pack 3.

For more information, please see the following article in the Microsoft Knowledge Base:

170365 INFO: Visual Studio 97 Service Packs - What, Where, and Why



Sample
// compile options : /c template  class C   { public: void fn(const T & t = T); };  class X   { public: X(int); ~X; };  C l;

Keywords: kbbug kbfix kbvs97sp2fix kbcpponly kbcompiler KB172980

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