什么是C ++的C ++等价物

问题描述

我希望避免托管C ++（CLI）中的溢出。在C＃中有一个未检查的关键字，并且在C ++溢出中不会在异常中结束。

为了引用，未检查的记录。基本上如果你这样做：

 取消选中
 {
 int1 = 2147483647 + 10; //在C＃和C ++中溢出，但在C＃和C ++中溢出
} 
  

不会溢出，但通过取最低有效位转换为int。注意：我意识到没有等价的C ++关键字，但是一些位移应该做的伎俩;

解决方案

您可以在方法周围使用 #pragma unmanaged 在本机C ++中。

I'm looking to avoid an overflow in managed C++ (CLI). In C# there is an unchecked keyword, and in C++ overflows do not end up in exceptions.

For reference, unchecked is documented here. Basically if you do:

unchecked
{
      int1 = 2147483647 + 10; //this overflows in CLI but is ok in C# and C++
}

In C# it will not overflow but convert to int by taking the least significant bits. This is appropriate when you compute hash codes for example.

Note: I realize there is no equivalent C++ keyword, but some bit shifting should do the trick;

解决方案

You can just use #pragma unmanaged around a method to get the normal unchecked behavior in native C++.

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