什么是在枚举定义的符号（〜）？ [英] What is the tilde (~) in the enum definition?

问题描述

我总是感到惊讶，即使是现在使用C＃这一切的时间后，我还是设法找到的东西我不知道...

I'm always surprised that even after using C# for all this time now, I still manage to find things I didn't know about...

我试图寻找上网本，但使用〜在搜索中不工作对我这么好，我没有在MSDN上找到任何事（不是说这是不存在的）

I've tried searching the internet for this, but using the "~" in a search isn't working for me so well and I didn't find anything on MSDN either (not to say it isn't there)

我看到了code最近，什么是波浪号（〜）指的这个片段？

I saw this snippet of code recently, what does the tilde(~) mean?

/// <summary>
/// Enumerates the ways a customer may purchase goods.
/// </summary>
[Flags]
public enum PurchaseMethod
{   
    All = ~0,
    None =  0,
    Cash =  1,
    Check =  2,
    CreditCard =  4
}

我是看到它，所以我试着编译它有些惊讶，和它的工作...但我仍然不知道这是什么意思/一样。任何帮助??

I was a little surprised to see it so I tried to compile it, and it worked... but I still don't know what it means/does. Any help??

推荐答案

〜是一元的补运营商 - 它翻转操作数的位

~ is the unary one's complement operator -- it flips the bits of its operand.

~0 = 0xFFFFFFFF = -1

在补运算，〜点¯x== -x-1

〜运算符可以在pretty找到太多，借鉴了C语法，其中的Objective-C / C ++ / C＃/的Java / Java脚本的任何语言​​。

the ~ operator can be found in pretty much any language that borrowed syntax from C, including Objective-C/C++/C#/Java/Javascript.

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