Microsoft KB Archive/240871

= BUG: Explicitly Specified Template Functions Not Overloaded Correctly =

Article ID: 240871

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
 * Microsoft Visual C++ 6.0 Enterprise Edition
 * Microsoft Visual C++ 6.0 Professional Edition
 * Microsoft Visual C++ 6.0 Standard Edition

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This article was previously published under Q240871



SYMPTOMS
If all the template parameters are not used in function arguments or return type of a template function, the template functions are not overloaded correctly.

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



CAUSE
The bug is the result of the way the compiler decorates template function names. Name Decoration uses the arguments and return type and doesn't use the explicitly specified template argument type. Therefore, all three template function instantiations receive the same decorated name, as seen in the sample code the "More Information" section.



RESOLUTION
Use dummy arguments to the function.



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



MORE INFORMATION
Please refer to the C++ Standard, section 14.8.1, for information on explicit template argument specification.

Steps to Reproduce Behavior
The following sample code demonstrates the problem: //#define WORKAROUND template  void f(T dummy = 0) {    std::cout < void f(void) {    std::cout <<typeid(T).name <<std::endl; }
 * 1) include
 * 1) ifdef WORKAROUND
 * 1) else
 * 1) endif

int main(void) {    f ; f ; f ; return 0; }

Output : int int int

Additional query words: STL

Keywords: kbbug kblangcpp kbtemplate kbstl kbcpponly kbpending kbcompiler KB240871

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