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

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Article ID: 165803 - View products that this article applies to.
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The sample code in the MORE INFORMATION section causes the compiler error C2783:
'declaration' : could not deduce template argument for 'identifier'


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


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article.

This problem was corrected in Microsoft Visual C++ version 6.0.


The following sample code demonstrates the problem and the workaround:


      /* 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 ;


Article ID: 165803 - Last Review: January 9, 2015 - Revision: 1.1
  • Microsoft Visual C++ 5.0 Enterprise Edition
  • Microsoft Visual C++ 5.0 Professional Edition
kbnosurvey kbarchive kbbug kbfix kbnoupdate kbvc600fix KB165803

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