GUID default value in c++

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Hello, I want to use a GUID in my class.

1) I want to give it a default value in the default constructor (something like 0, NULL, etc). How can I do it?

2) In another constructor, I want to give it a default value in a case the call for the constructor dont have it. for example:

the constructor: MY_CLASS(int a, int b, int c = 0, GUID g = ???)
the call: MY_CLASS m = new MY_CLASS(5,3);

How can i do it?

Thanks

Posted 11-Apr-11 18:50pm

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Himansu sekhar bal · Answer 1 · 2011-04-11T19:31:00

Default value of a GUID: GUID_NULL, or IID_NULL (it is alias of GUID_NULL)

GUID_NULL is a GUID set to zero. Here's a string representation '{00000000-0000-0000-0000-000000000000}'
typedef struct _GUID
{
unsigned long Data1;
unsigned short Data2;
unsigned short Data3;
unsigned char Data4[8];
} GUID;
const GUID GUID_NULL = { 0, 0, 0, { 0, 0, 0, 0, 0, 0, 0, 0 } };