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Multiple declaration error during linking
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Hello,
I am stuck with a multiple declaration error during linking.
I have 4 C++ source and corresponding header files(A, B, C,D) and one main source file(Main.cpp).
Apart from that, I have one header file which contains two function declarations and some #define constants (Config.h) and 2 array decl which are used in the functions itself.
I have #included the he Config.h in Main.cpp, A.h, B.h, C.h.
I have also #included A.h in Main.cpp
Actually, I am using one function from Config.h in Main.cpp and another function in A.cpp.
Now, in this situation I have compiled all the source files separately.
When I am trying to create the exec, during linking of A.o, B.o, C.o, D.o and Main.o...I get error of multiple definition of functions and array declarations.
Please suggest to overcome this error!!!
I am stuck with a multiple declaration error during linking.
I have 4 C++ source and corresponding header files(A, B, C,D) and one main source file(Main.cpp).
Apart from that, I have one header file which contains two function declarations and some #define constants (Config.h) and 2 array decl which are used in the functions itself.
I have #included the he Config.h in Main.cpp, A.h, B.h, C.h.
I have also #included A.h in Main.cpp
Actually, I am using one function from Config.h in Main.cpp and another function in A.cpp.
Now, in this situation I have compiled all the source files separately.
When I am trying to create the exec, during linking of A.o, B.o, C.o, D.o and Main.o...I get error of multiple definition of functions and array declarations.
Please suggest to overcome this error!!!
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Join Date: Aug 2005
Posts: 15,500
Reputation: 
Solved Threads: 1479
Put only function prototypes and extern object declarations in header files, such as
Now, in one and only one *.cpp file you have to declare the same without the extern keyword.
C++ Syntax (Toggle Plain Text)
Now, in one and only one *.cpp file you have to declare the same without the extern keyword.
C++ Syntax (Toggle Plain Text)
Last edited by Ancient Dragon; May 5th, 2009 at 8:52 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
Thanks for you reply!!!
But, suppose if I want to keep the array decl and the function implementations in Config.h and I use one function from Config.h in Main.cpp and another function from Config.h in A.cpp.
How to do this way???
Please help!!!
But, suppose if I want to keep the array decl and the function implementations in Config.h and I use one function from Config.h in Main.cpp and another function from Config.h in A.cpp.
How to do this way???
Please help!!!
•
•
Join Date: Aug 2005
Posts: 15,500
Reputation:
Solved Threads: 1479
>>How to do this way???
You don't! Function implementations can not be put in header files for the reason you have already discovered -- duplicate definition errors.
You don't! Function implementations can not be put in header files for the reason you have already discovered -- duplicate definition errors.
Last edited by Ancient Dragon; May 5th, 2009 at 10:07 pm.
Don't PM me with questions -- you might get a nasty PM in response. If you have a question then post it in one of the forums.
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