Assigning values to union in C++

[pranava]

Thanks, but that too didn't work. Someone else suggested this that worked ok.

Use the compiler instead of the preprocessor.

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//#define UUID_SELF {0,0,0,2}
const UUID UUID_SELF = {0,0,0,2} ;


And then, either:
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EntryHeader entry ;
entry.uuid = UUID_SELF ;

or: EntryHeader entry = { UUID_SELF /*, .... */ } ;