问题描述
我正在编写我的代码，好像它们都是一样的，并且没有问题，但是当我将鼠标悬停在Visual Studio中的函数上并看到类型定义包含3种不同的类型时，这开始使我感到困惑原以为都是一样的.他们是一样的吗?还是不同?
I'm writing my code as if these are all the same thing, and having no problems, but it's starting to confuse me when I hover over a function in Visual Studio and see that the type definitions contain 3 different types that I had thought were all the same. Are they the same? Or are they different?
推荐答案
它们是相同的.请参阅 FSharp.Core 文档. float = double = System.Double 和 array<'T>='T [] .您还可以定义自己的类型缩写，并以相同的方式使用它们:
They are the same. See the type abbreviations at the bottom of the FSharp.Core documentation. float = double = System.Double and array<'T> = 'T[]. You can also define your own type abbreviations and use them the same way:
type dbl = double
let (d:dbl) = 1.0
您没有询问它，但是请注意，类型缩写可能无法像您期望的那样工作的地方是度量类型. float< _> 的定义独立于 float ， double 和 System.Double ，并且没有这样的东西作为相应的 double< _> 或 System.Double< _> .
You didn't ask about it, but note that the one place where type abbreviations might not work quite like you'd expect is measure types; float<_> is defined independently of float, double, and System.Double, and there's no such thing as a corresponding double<_> or System.Double<_>.
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