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HEADER AND PROTOTYPES

Started by blue-ice2002 Jan 1, 2003 at 4:57 PM 2 replies 150+ views

Original Post

blue-ice2002

Jan 1, 2003 at 4:57 PM

I WONDER WHY FOR A CLASS WE USE 2 FILES.HEADER FOR PROROTYPE AND CPP FOR THE DEFINITIONS.I MEAN WHAT happens if i write the functions definition in the header file too.instead of doing void aclass::member_a(){ //code here } in .cpp /is there an adventage of this or its used in includes for not getting errors with redefinition or something.and i have another question when i create a class in a cpp to see it in another header file i do extern thename i created /but in another cpp i cant do extern cause i include the header i used extern in the other cpp i want to use that class too.so it gives error in extern line.please help me...thanks

Metal Typhoon

Jan 1, 2003 at 4:59 PM

quote:
Original post by blue-ice2002
I WONDER WHY FOR A CLASS WE USE 2 FILES.HEADER FOR PROROTYPE AND CPP FOR THE DEFINITIONS.I MEAN WHAT happens if i write the functions definition in the header file too.instead of doing void aclass::member_a(){
//code here
}

in .cpp /is there an adventage of this or its used in includes for not getting errors with redefinition or something.and i have another question when i create a class in a cpp to see it in another header file i do extern thename i created /but in another cpp i cant do extern cause i include the header i used extern in the other cpp i want to use that class too.so it gives error in extern line.please help me...thanks

nothing happens.. just a matter of organization

Zorak

Jan 1, 2003 at 5:06 PM

If you have the function code in the header, you will sooner or later get link errors alá "function is already define in object object.obj". Since you define it once every time you include the file.

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