.net C++中的“^”符号是什么？
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What is the "^" symbol in C++?
提问by Android Eve
Has a new symbol joined the C++ language specification while I was sleeping under a rock?
当我在一块石头下睡觉时，是否有一个新符号加入了 C++ 语言规范？
I just encountered the following question:
我刚刚遇到以下问题：
Restrict Text Box to only accept 10 digit number
Which suggests that the '^' symbol is somehow part of C++ (not in the legacy meaning of a bitwise-XOR)
这表明“^”符号在某种程度上是 C++ 的一部分（不是按位异或的传统含义）
Is this so?
是这样吗？
If so, what does it mean? (I tried to google the questionbut Google didn't come up with satisfactory answers)
如果是这样，这意味着什么？（我试图用谷歌搜索这个问题，但谷歌没有给出满意的答案）
回答by Martin Liversage
In C++ the “^” symbol is the bitwise exclusive or (xor) operator. For a single bit you have 0 ^ 0 = 1 ^ 1 = 0and 0 ^ 1 = 1 ^ 0 = 1.
在 C++ 中，“^”符号是按位异或 (xor) 运算符。对于一点，你有0 ^ 0 = 1 ^ 1 = 0和0 ^ 1 = 1 ^ 0 = 1。
However, in the question you are refering to it is part of Microsoft special syntax for C++ development on the .NET platform known as C++/CLI or It Just Works.
但是，在您所指的问题中，它是 Microsoft 在 .NET 平台上进行 C++ 开发的特殊语法的一部分，称为 C++/CLI 或It Just Works。
Memory on .NET is garbage collected and references to objects will have to be tracked. This makes it impossible to reference these objects using a normal C++ pointer. Microsoft has decided to reuse the “^” symbol to declare a variable somewhat similar to a pointer that can reference an object on the managed heap.
.NET 上的内存被垃圾收集，并且必须跟踪对对象的引用。这使得无法使用普通的 C++ 指针来引用这些对象。Microsoft 已决定重用“^”符号来声明一个变量，该变量有点类似于可以引用托管堆上的对象的指针。
回答by Nick Lewis
In Visual C++, ^represents a handle to a managed object. Essentially what in C# would be a reference. Allocate them with gcnewinstead of new, and they will be garbage collected for you. This is how Visual C++ interacts with the CLI.
在 Visual C++ 中，^表示托管对象的句柄。本质上，C# 中的内容将是一个参考。使用gcnew而不是分配它们new，它们将为您进行垃圾收集。这就是 Visual C++ 与 CLI 交互的方式。
回答by Joel
In the referenced answer, it's not part of the standard C++ language, it's part of the C++/CLI language that Microsoft cobbled together for .NET interop. In that language, ^ means a "pointer to managed memory."
在引用的答案中，它不是标准 C++ 语言的一部分，而是 Microsoft 为 .NET 互操作拼凑而成的 C++/CLI 语言的一部分。在该语言中，^ 表示“指向托管内存的指针”。
回答by Stu Mackellar
The '^' syntax refers to a tracking referencein C++/CLI, a Microsoft extension to C++ which enables interaction with managed code.
的“^”的语法是指跟踪参考在C ++ / CLI，Microsoft扩展到C ++，其使得能够与托管代码的相互作用。
回答by James Curran
It's not part of Standard C++. It's part of Managed C++ (Microsoft's language much like C++ for .NET). It means "a reference to ----" in much the same way a "*" means "A pointer to -----" is Standard C++.
它不是标准 C++ 的一部分。它是托管 C++（微软的语言，很像 .NET 的 C++）的一部分。它的意思是“对 ---- 的引用”，与标准 C++ 中的“*”的意思是“指向 ----- 的指针”大致相同。
