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dereference    
復引用

復引用

To access the thing to which a pointer points,
i.e. 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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