Re: Writing a C Compiler: lvalues

On 5/16/2010 4:20 PM, Marc van Lieshout wrote:
>
> An lvalue is an expression that evaluates to an address, so it *can* be
> used on the left hand side of an assignment.


          That won't quite do. Here are two counter-examples, one an
expression that evaluates to an address but is not an lvalue:


malloc(42)


... and one an lvalue that cannot possibly involve an address:


register int x;
x = 42;


An lvalue (we're talking C here, right?) "is an expression with an
object type or an incomplete type other than void" (6.3.2.1p1).


--
Eric Sosman
esosman@ieee.org

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