| slovo | definícia |
dereference
(encz) | dereference, |
dereference
(foldoc) | dereference
To access the thing to which a pointer points;
to "follow" the pointer. E.g. in C, the declarations
int i;
int *p = &i;
declare i as an integer and p as a pointer to integer. p is
initialised to point at i ("&i" is the address of i - the
inverse of "*"). The expression *p dereferences p to yield i
as an lvalue, i.e. something which can appear either on the
left of an assignment or anywhere an integer expression is
valid. Thus
*p = 17;
would set i to 17. *p++ is not the same as i++ however since
it is parsed as *(p++), i.e. increment p (which would be an
invalid thing to do if it was pointing to a single int, as in
this example) then dereference p's old value.
The C operator "->" also dereferences its left hand argument
which is assumed to point to a structure or union of which
the right hand argument is a member.
At first sight the word "dereference" might be thought to mean
"to cause to stop referring" but its meaning is well
established in jargon.
(1998-12-15)
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