BUG: Error C2783 - Cannot Deduce Non-Type Template Parameter

 Last reviewed: May 21, 1997
Article ID: Q165803
The information in this article applies to:
  • The C/C++ Compiler (CL.EXE) included with: - Microsoft Visual C++, 32-bit Editions, version 5.0

SYMPTOMS

The sample code in the MORE INFORMATION section causes the compiler error C2783: 

   "'declaration' : could not deduce template argument for 'identifier'"

RESOLUTION

The workaround is to avoid argument deduction by specifying the template- parameter-list when calling the function template.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. We are researching this bug and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

The following sample code demonstrates the problem and the workaround:

SAMPLE

      /* Compile options needed: none
      */

      template <int I>
      struct C
      {
          int a[I] ;
      };

      template <int I>
      int F(C<I> a)
      {
          return I ;
      }

      int main ()
      {
          int i;
          C<4>  CObj ;

          i  = F(CObj);


          // Workaround: Comment the line above.
          // Uncomment the following line
          // i = F<4>(CObj);

          return 0 ;
      }

Keywords : CLIss CPPLngIss vcbuglist500 kbbuglist
Version : 5.0
Platform : NT WINDOWS
Issue type : kbbug

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Last reviewed: May 21, 1997
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