（）运算符在C ++中做了什么 [英] What does the () operator do in C++

问题描述

我正在阅读我的C ++书籍，它提供了关于（）运算符的非常少的信息 - 他说这不是很重要，但我很想知道这个算子是什么，也许我会在某一天使用它。



谢谢，Sam

Hi, I was reading my C++ book which a gave a very little information about the () operator - He said that's not very important, But I'm curious to know what is this operator, maybe I'll use it someday.

Thanks, Sam

推荐答案

您可以将（）运算符视为没有类的方法一个名字，因为它（几乎）是你调用这个运算符时的样子：而不是

You can think of the () operator as a classs method without a name, because that is (almost) how it looks when you invoke this operator: rather than

myobject.foo();
myobject.bar(1, 3.13, "hello world");

来电看起来像这样：

the calls would look like this:

myobject();
myobject(1, 3.13, "hello world");

请注意，'。'缺失;这是有目的的，因为这个想法是像类函数一样使用类对象。这个操作符的主要用途是函数编程（记住，C ++不是面向对象的语言，它是一种通用语言，因此适用于任何编程范例！），以及通用编程。

Note that the '.' is missing; this is on purpose, because the idea is to use the class object like a function. The main use of this operator is in functional programming (remember, C++ is not an object oriented language, it is a general purpose language, and therefore suitable for any programming paradigm!), and in generic programming.

这就到了这一点。

https://en.wikipedia.org/wiki/ Function_object [ ^ ]

This gets to the point.
https://en.wikipedia.org/wiki/Function_object[^]

这是函数形式或函数调用运算符或转换（C样式转换）运算符。我不知道一本书怎么能用7行来解释它，我没有热情去发现。使用体面的东西：

https://en.wikipedia.org/wiki/Operators_in_C_and_C% 2B％2B [ ^ ]，

http://www.cplusplus.com/doc/tutorial/operators [ ^ ]，

http://www.tutorialspoint.com/cplusplus/function_call_operator_overloading.htm [ ^ ]，

http://www.cplusplus.com/doc/tutorial/typecasting [ ^ ]，

https://msdn.microsoft.com/en-us/library/df74sak1.aspx [ ^ ]，

https://msdn.microsoft.com/en-us/library/ts48df3y.aspx [ ^ ]。

-SA

This is a functional form or function-call operator or conversion (C-style cast) operator. I have no idea how a book can explain it all in 7 lines, and I have no enthusiasm to find out. Use something decent:
https://en.wikipedia.org/wiki/Operators_in_C_and_C%2B%2B[^],
http://www.cplusplus.com/doc/tutorial/operators[^],
http://www.tutorialspoint.com/cplusplus/function_call_operator_overloading.htm[^],
http://www.cplusplus.com/doc/tutorial/typecasting[^],
https://msdn.microsoft.com/en-us/library/df74sak1.aspx[^],
https://msdn.microsoft.com/en-us/library/ts48df3y.aspx[^].

—SA

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