是取消引用指针有效左值? [英] Is a dereferenced pointer a valid lvalue?
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问题描述
假设定义:
INT I = 10;
为int * p =&放;我;
为什么* P一个有效左值这里:
* P + = 10;
应该不是* P计算为贮存于放大器的整型值;我,即得。 10,因此产生了不是左值的错误?
解决方案
在左值是指一个地区的前pression
存储的能够被操纵
块引用>
* P
就是这样一个前pression指向存储的区域。这比说10 + = 10个不同的;
,因为10
并非当然pression,它是一个整数文字。Assuming the definition:
int i = 10; int *p = &i;
Why is *p a valid lvalue here:
*p+=10;
Shouldn't *p evaluate to the value of the int stored at &i, ie. 10, and hence generate a "Not an lvalue" error?
解决方案An lvalue is an expression that refers to a region of storage that can be manipulated.
*p
is such an expression that refers to a region of storage. This is different than say10+=10;
because10
is not an expression, it is an integer literal.这篇关于是取消引用指针有效左值?的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
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