-14 Apr 97  21:29:41-
=Alexander Derazhne babbled to All about About bit-field syntax=
 AD> struct A { unsigned int x : 1,              y : 2,              z: 5; };
 AD> struct B { unsigned int x : 1; unsigned int y : 2; unsigned int z : 5; 
}; 
 AD> A a; B b;
 AD> === Begin Test.R ===
 AD> sizeof A is 1
 AD> sizeof B is 1
 AD> === End Test.R ===
 AD> Struct 'a' must contain all fields in one 'unsigned int', but it
 AD> use only 1 byte (must be 4)! Struct 'b' is more strange: I need 3
 AD> separeted 'unsigned int', but got 1 byte! IMHO, it's wrong: compiler
It's not wrong.  You have told it that you only want one byte (exactly
8 bits up there!) when you put those colons in there.  Try adding
another field or make one of those wider.
Also, you have declared exactly the same thing for A and B.  When you
use a comma like that, it is just shorthand for what's in B.
 AD> must use a separate places for it and corresponding size - this
That would completely defeat the purpose of bitfields.
AD> structure may be a mirror of hardware registers!
In which case it would have been even more inappropriate to ignore your
request that the struct be a bitfield.  AH is hardly 96 bits wide.
 
 AD> May be it's a bug of BCOS2 2.0 ?
Your compiler has several bugs, but this is not one of them.
Mike Phillips
INTERNET:  phil4086@utdallas.edu
... Q: How do you deal with heavy traffic?  A: Heavy psychedelics.
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