Re: RValue Arrays

David Abrahams <dave@[EMAIL PROTECTED]
> writes:

| on Sun Jul 20 2008, rkldabs-AT-gmail.com wrote:
|
| > I was not sure about what is an rvalue array and hence a little
| > googling threw up the following site 
"http://209.85.175.104/search?q=cache:r1-djlzAyBUJ:www.open-std.org/jtc1/sc22/wg14/www/docs/n835.ps+An+lvalue+or+rvalue+of+type+%E2%80%9Carray+of+N+T%E2%80%9D&hl=en&ct=clnk&cd=1&gl=in"
| >
| > I would like to know a little more about RValue Arrays. The standard
| > as far as I have understood does not clearly explain RValue arrays.
|
| I think the only thing that makes array rvalues different from other
| rvalues is that they never exist except as a subobject of some other
| rvalue.  For example:
|
|           struct X
|           {
|               int a[20];
|           };
|
| Now
|          X()
|
| is an rvalue of type X and
|
|          X().a
|
| would be an rvalue array... if I'm not mistaken, that is ;-)

Yes, that is correct.  A disturbing point is that all components of that
rvalue array are lvalues!  This defect was inherited from C90 which
did not appreciate the existence of rvalue arrays.

-- 
Dr. Gabriel Dos Reis (gdr@[EMAIL PROTECTED]
), Assistant Professor
	      http://www.cs.tamu.edu/people/faculty/gdr
	Texas A&M University -- Department of Computer Science
	301, Bright Building -- College Station, TX 77843-3112

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