FIX: C1001 Including Header File in Template Class Definition

• Microsoft C/C++ Compiler (CL.EXE), included with:
  • Microsoft Visual C++ 32-bit Edition, versions 4.0, 4.1

SYMPTOMS

If you use the #include preprocessor directive in a template class definition, the following internal compiler error may be generated:

fatal error C1001: INTERNAL COMPILER ERROR
(compiler file 'msc1.cpp', line 899)
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Help menu, or open the Technical Support help file for more information

RESOLUTION

Do not use #include directive in a template class definition.

STATUS

Microsoft has confirmed this to be a bug in the Microsoft products listed at the beginning of this article. This problem was corrected in Microsoft Visual C++, 32-bit Edition, version 4.2.

MORE INFORMATION

Sample Code

// Compile Options - none

//test.cpp

template <class T> class TestClass {
public:
  #include "test.h" // this line generates the C1001 error

};

TestClass<char> ClassInst;

//end test.cpp

//test.h
#define TEST 1

//end test.h 

Additional query words: kbVC400bug 4.00 4.10 10.00 10.10 vcfixlist420

Keywords : kbCompiler kbCPPonly kbVC
Version : :4.0,4.1
Platform : NT WINDOWS
Issue type :