C++ Class Problem
Author
One of my classes (for this example Class1) uses an object of another class (Class2) as a parameter for a method. When I try to compile I get:
error C2061: syntax error : identifier ''Class2''
So I thought to fix this problem I would add...
#include "class2.h"
to ''Class1.h''. But now whenever I compile I get an error saying:
error C2011: ''Class2'' : ''class'' type redefinition
I know I''m doing something wrong but I don''t know how to correct it.
you need to put #ifndef into your code
this tells the compiler that if it has already included this section of code, not to do it again (redefinition)
cyn
EDIT - fixed source tags
[edited by - cyn on May 5, 2002 11:02:23 PM]
//class1.h#ifndef CLASS1#define CLASS1// your code here#endif this tells the compiler that if it has already included this section of code, not to do it again (redefinition)
cyn
EDIT - fixed source tags
[edited by - cyn on May 5, 2002 11:02:23 PM]
It''s a FAQ.
class1.h
class2.h
Your source (.cc, .C, .cpp, .cxx ...) files will still need to include both class1.h and class2.h
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Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
class1.h
#ifndef CLASS1_HEADER#define CLASS1_HEADERclass class2; // declare class2class class1 // define class1{ // can now use class2 (only) as return type, // parameter, pointer or reference.}#endif class2.h
#ifndef CLASS2_HEADER#define CLASS2_HEADERclass class1; // declare class1class class2 // define class2{ // can now use class1 (only) as return type, // parameter, pointer or reference.}#endif Your source (.cc, .C, .cpp, .cxx ...) files will still need to include both class1.h and class2.h
[Questions (STFW) | GDNet Start Here | GDNet Search | Forum FAQ | Google | Asking Smart Questions ]
[Docs (RTFM) | MSDN | SGI''s STL | OpenGL | File formats]
[C++ Must Haves (RTFS) | MinGW | Boost | Loki | FLTK | SDL ]
Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
This article might help you:
http://www.gamedev.net/reference/programming/features/orgfiles/
http://www.gamedev.net/reference/programming/features/orgfiles/
cyn: he''s got a recursive definition problem, not just a multiple header inclusion problem.
There is an article by Kylotan there.
Go study it and you will be enlightened
[Questions (STFW) | GDNet Start Here | GDNet Search | Forum FAQ | Google | Asking Smart Questions ]
[Docs (RTFM) | MSDN | SGI''s STL | OpenGL | File formats]
[C++ Must Haves (RTFS) | MinGW | Boost | Loki | FLTK | SDL ]
Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
There is an article by Kylotan there.
Go study it and you will be enlightened
[Questions (STFW) | GDNet Start Here | GDNet Search | Forum FAQ | Google | Asking Smart Questions ]
[Docs (RTFM) | MSDN | SGI''s STL | OpenGL | File formats]
[C++ Must Haves (RTFS) | MinGW | Boost | Loki | FLTK | SDL ]
Stolen from Magmai Kai Holmlor, who held it from Oluseyi, who was inspired by Kylotan...
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