解引用运算符

解引用运算符（dereference operator）或称间址运算符（indirection operator）。[1]C语言编程语言家族中常表示为"*" (一个星号)，为单元运算符，作用于1个指针变量，返回该指针地址的等效左值。这被称为指针的解引用。例如： 

 int x;  int *p;  // * is used in the declaration:           // p is a pointer to an integer, since (after dereferencing),           // *p is an integer  x = 0;  // now x == 0  p = &x;  // & takes the address of x  // now *p == 0, since p == &x and therefore *p == x  *p = 1;  // equivalent to x = 1, since p == &x  // now *p == 1 and x == 1

在C语言中，&是解引用运算符*的逆运算。因此*&s等价于s。例如： 

 p = &s; // the address of s has been assigned to p; p == &s;  // *p is equivalent to s

结构s的成员a的值可表示为s.a。若指针p指向s (即p == &s), s.a等价于(*p).a，也可用结构解引用运算符作为语法糖缩写表示为p->a： 

 p = &s; // the address of s has been assigned to p; p == &s;  // s.a is equivalent to (*p).a  // s.a is equivalent to p->a  // (*p).a is equivalent to p->a

Unix的外壳脚本以及一些工具软件如Makefile中，美元符"$"为解引用运算符，用于把变量名字转译为其内容。

参见

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参考文献

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  1. ^ Pointer related operators (C# reference)， source：MSDN. [2022-03-04]. （原始内容存档于2022-07-09）. 
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