C ++中运算符和函数之间的区别？ [英] Difference between operator and function in C++?

问题描述

我可以使用一些帮助理解C ++中的以下内容，特别是运算符和函数之间的区别：

• 什么是运算符


• 什么是功能？


• 它们之间有什么区别？


• c c $ 操作符在编译时对操作数进行操作？它们总是在编译时运行吗？ （如C ++中的 sizeof（））



解决方案>

是 + ， - ， + = 等等（见13.5）。他们没有意义。在语义分析期间，确定运算符的含义。

函数是一个构造函数，析构函数，转换函数（看起来像 operator type（））或操作符函数（功能模板专门化和实例化可以依次产生这些）。

是操作符例如 operator + 。这些是在所有方面的函数，并且与通常函数的唯一区别是它们可能被隐式调用，并且它们有一个有趣的名字。

一些操作符有一个内置的含义，可以由程序员修改。一个是简单地通过说出内置的操作符来说明操作符的内在含义（见5/3）。但是，如果将这样的运算符应用于定义了内置含义的操作数，则仅允许在少数情况下更改该含义（这些是赋值，地址和逗号运算符，见13.5 / 6）。

I could use some help understanding the following in C++, particularly the difference between an operator and a function:

• What is an operator?
• What is a function?
• What is the difference between them?
• Is a user-defined operator+() a function or an operator?
• Can an operator operate on operands at compile-time? Do they always operate at compile time? (like sizeof() in C++)

解决方案

An operator is a symbol like +, -, += and so forth (see 13.5). They don't carry a meaning. During semantic analysis, the meaning of an operator is determined.

A function is a constructor, destructor, conversion function (that looks like operator type()) or operator function (function template specialization and instantiation can yield these in turn).

An operator function is something that implements an operator (see 13.5). An example is operator+. These are functions in all respects, and the only difference to "usual" functions is that they may be called implicitly and they have a funny name.

Some operators have a built-in meaning, that can be changed by the programmer. One refers to the built-in meaning of an operator simply by saying built-in operator (see 5/3). However, if such an operator is applied on operands for which a built-in meaning is defined, changing that meaning is only allowed for a few cases (these are assignment, address-of and the comma operator, see 13.5/6).

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