标准转换：数组到指针的转换 [英] standard conversions: Array-to-pointer conversion

问题描述

这是从ISO的点：标准转换：数组到指针的转换：$ 4.2.1 的

这是左值或类型的右值数组
  NT·的或未知的数组边界的
  T可被转换为右值
  类型指针到T的结果是
  的指针的第一个元素
  该数组。

An lvalue or rvalue of type "array of N T" or "array of unknown bound of T" can be converted to an rvalue of type "pointer to T." The result is a pointer to the first element of the array.

可以的，如果可能的一个例子程序，任何一个解释。

Can any one explain this, if possible with an example program.

我看到这些链接了，但我无法理解：

I seen these links already, but i am unable to understand:

阵列和右值

<一个href=\"http://stackoverflow.com/questions/4058151/i-think-i-may-have-come-up-with-an-example-of-rvalue-of-array-type\">I想我可能已经想出了数组类型的右值的一个例子

推荐答案

在C和C ++编写的阵列可以就好像它是一个指向第一个元素被使用。实际上，鉴于命名的数组 X ，可以替换＆放的大多数用途; X [0] 只有 X 。

In both C and C++, an array can be used as if it were a pointer to its first element. Effectively, given an array named x, you can replace most uses of &x[0] with just x.

这是下标是如何能够用数组对象使用：

This is how subscripting is able to be used with array objects:

int x[5];
x[2];     // this is the same as (&x[0])[2]

这也是一个阵列可以如何被传递到具有指针类型的参数的函数：

This is also how an array can be passed to a function that has a parameter of pointer type:

void f(int* p);

int x[5];
f(x);     // this is the same as f(&x[0])

有若干上下文，其中阵列到指针转换不会发生。例子包括：当一个数组是中的sizeof 操作数或一元 - ＆安培; （经营地址的），当一个字符串文字是用来初始化数组，当一个数组被绑定到一个数组的引用。

There are several contexts in which the array-to-pointer conversion does not take place. Examples include when an array is the operand of sizeof or the unary-& (the address-of operator), when a string literal is used to initialize an array, and when an array is bound to a reference to an array.

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