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dereference 复引用 复引用 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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