Microsoft KB Archive/122300

= FIX: C1001 Error for typedef Within the Class Declaration =

Article ID: 122300

Article Last Modified on 10/24/2003

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APPLIES TO


 * Microsoft Visual C++ 2.0 Professional Edition
 * Microsoft Visual C++ 6.0 Service Pack 5

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This article was previously published under Q122300



SYMPTOMS
Compiling the code that uses a class declaration with a typedef of itself, as demonstrated by the sample code in the More Information section, produces this error:

fatal error C1001: INTERNAL COMPILER ERROR

(compiler file 'msc1.cpp', line 1056)

Please choose the Technical Support command on the Visual C++ Help menu, or open the Technical Support help file for more information



RESOLUTION
Use a forward declaration for the class, and place the typedef line before the class declaration: class A;  typedef A B; Alternatively, enclose the returned typedef name in parentheses to indicate that the constructor is used to return the value (see AltRetB in the sample code).



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 4.0.



Sample Code
/* Compile options needed: none

class A { typedef A B;

B RetB { return B(*this); }     // this causes the error

B AltRetB { return (B)(*this); } // this line is OK };

Additional query words: 2.00 9.00 buglist2.00

Keywords: kbbug kbfix kbcpponly kbcompiler KB122300

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