Q268239: BUG: C2084 on Overloading Function Templates

Article: Q268239
Product(s): Microsoft C Compiler
Version(s): 6.0
Operating System(s): 
Keyword(s): kbCompiler kbCPPonly kbVC600bug kbDSupport
Last Modified: 03-MAY-2001

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The information in this article applies to:

- The C/C++ Compiler (CL.EXE), included with:
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 6.0 
   - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 
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SYMPTOMS
========

You may receive the following error message if you try to overload a template
function that has class templates as parameters:

  error C2084: function 'void __cdecl f1(class A<T>,class A<T>)'
  already has a body

Please refer to the sample code in the "More Information" section for details.

RESOLUTION
==========

See the workaround in the sample code in the "More Information" section.

STATUS
======

Microsoft has confirmed this to be a bug in the Microsoft products listed at the
beginning of this article.


MORE INFORMATION
================

Steps to Reproduce Behavior
---------------------------

The following sample code demonstrates the bug and the workaround:

  //test.cpp
  // Compiler option needed: none.<BR/>
  //#define WORKAROUND  //Uncomment this line to work around the bug.
  template<class T>
  class A {
  };

  #ifndef WORKAROUND
  template<class T>
  void f1(A<T> a, A<T> b){}
  #else
  template<class T1, class T2>
  void f1(A<T1> a, A<T2> b){}
  #endif
  void f1(A<int> a, A<long> b){} //C2084 here. 
  void f1(A<int> a, A<int> b){}  //Compiles fine.
  void f1(A<long> a, A<long> b){} //Compiles fine.

  int main()
  {
  A<int>  a;
  A<long>  b;
  f1(a,b);
  return 0;
  }

   

Additional query words: C2084

======================================================================
Keywords          : kbCompiler kbCPPonly kbVC600bug kbDSupport 
Technology        : kbVCsearch kbAudDeveloper kbCVCComp
Version           : :6.0
Issue type        : kbbug

=============================================================================

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