Article: Q240871
Product(s): Microsoft C Compiler
Version(s): winnt:5.0,6.0
Operating System(s):
Keyword(s): kbtemplate kbCompiler kbCPPonly kbLangCPP kbSTL kbVC kbVC500 kbVC500bug kbVC600 kbVC600
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 5.0
- Microsoft Visual C++, 32-bit Professional Edition, version 5.0
- 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
========
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 this to be a bug in the Microsoft products 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:
#include<iostream>
//#define WORKAROUND
#ifdef WORKAROUND
template <class T>
void f(T dummy = 0)
{
std::cout <<typeid(T).name() <<std::endl;
}
#else
template <class T>
void f(void)
{
std::cout <<typeid(T).name() <<std::endl;
}
#endif
int main(void)
{
f<bool>();
f<char>();
f<int>();
return 0;
}
Output :
int
int
int
Additional query words: STL
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Keywords : kbtemplate kbCompiler kbCPPonly kbLangCPP kbSTL kbVC kbVC500 kbVC500bug kbVC600 kbVC600bug kbDSupport
Technology : kbVCsearch kbAudDeveloper kbCVCComp
Version : winnt:5.0,6.0
Issue type : kbbug
Solution Type : kbpending
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