标运算符后缀 [英] subscript operator postfix

问题描述

C ++标准定义了使用标为后缀的前pression除权pression。据我所知，这个操作符总是有两个参数（第一个是指向T和另一种是枚举或整型）。因此，它应该有资格作为一个二元运算。

The C++ standard defines the expression using subscripts as a postfix expression. AFAIK, this operator always takes two arguments (the first is the pointer to T and the other is the enum or integral type). Hence it should qualify as a binary operator.

不过 MSDN 和<一个href=\"http://publib.boulder.ibm.com/infocenter/comphelp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8a.doc%2Flanguage%2Fref%2Fcplr324.htm\"相对=nofollow> IBM 没有列出它作为一个二元运算符。

However MSDN and IBM does not list it as a binary operator.

所以，问题是，什么是下标运算符？它是一元或二进制？可以肯定的，因为它不是在（至少straigt远）提到的$ 5.3是不是一元。

So the question is, what is subscript operator? Is it unary or binary? For sure, it is not unary as it is not mentioned in $5.3 (at least straigt away).

这是什么意思时，标准提到它在后缀前pression的？

What does it mean when the Standard mentions it's usage in the context of postfix expression?

推荐答案

您是正确的，运算符[] 是一个二元运算符，但它是特殊的，它也必须是一个成员函数。

You are correct that operator[] is a binary operator but it is special in that it must also be a member function.

类似操作符（）

您可以前后缀pressions的这里

You can read up on postfix expressions here

我刚刚发现关于运算符[] 和后缀前pression，的这里

I just found an interesting article about operator[] and postfix expression, here

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