为什么不能将结构声明为常量？ [英] Why can't structs be declared as const?

问题描述

他们是在栈上不可变的值类型。是什么让我从他们有一个const？

They are immutable value types on the stack. What keeps me from having them a const?

参考文献：

• http://msdn.microsoft.com/en-us/library/ah19swz4(v=vs.71).aspx


• http://msdn.microsoft.com/en-us/library/aa664465(v=vs.71).aspx


• http://msdn.microsoft.com/en-us/library/aa288471(v=vs.71).aspx

推荐答案

由于值类型的构造可能会做的任何的 - 例如，切换逻辑的基础上一天的时间。恒值类型是有道理的理智，但它根本无法自定义值类型在实践中，由于构造为所欲为讨好的灵活性工作。 （请记住，常量在编译时计算，的，这意味着你的构造将不得不在编译时运行。）

Because the value type constructor might do anything -- for example, switch logic based on the time of day. Constant value types makes sense intellectually, but it simply cannot work on custom value types in practice due to the flexibility of constructors to do whatever they please. (Remember that constants are evaluated at compile time, which means your constructor would have to be run at compile time.)

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