struct type redefinition error

[boon kian]

Hi all, I have a vc problem which i am unable to think of a solution. so can anyone help ?? i have a data type as follow: typedef struct complextag { double dRe; double dIm; } COMPLEX; and i have 3 classes which need this data type. (main class, class A and class B). The main class will have to interact with class A and class B and pass a COMPLEX variable to them. Hence i have put the "typedef struct complextag" in the class A and class B header. I also include the class A and class B header in class main. However when i compile the program, vc complaint of this "error C2011: 'complextag': 'struct type redefinition' is there a way to solve this prob ?? or is there a way to make the COMPLEX data type to be universal like "int" or "float" ??? Thank you very much for the kind attention.

[PJ Arends]

One way ( I am sure there are others ) is to wrap the declaration in an #define macro. That way it will not get redeclared.

#ifndef I_ALREADY_DEFINED_THIS_STRUCT
#define I_ALREADY_DEFINED_THIS_STRUCT
typedef struct complextag
{
double dRe;
double dIm;
} COMPLEX;
#endif

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CPUA 0x5041 Sonork 100.11743 Chicken Little "So it can now be written in stone as a testament to humanities achievments "PJ did Pi at CP"." Colin Davies Within you lies the power for good - Use it!

[Stephane Rodriguez]

Put the type definition in a header file (just in case), and add #pragma once at the top of it.

[boon kian]

Hi PJ Arends and .S.Rod. Really thanx a lot for your help !! I have used the suggested macro and it works !!