难道F＃具有相当的语法C＃的＆QUOT;不安全＆QUOT;块 [英] Does F# have equivalent syntax to C#'s "unsafe" block

问题描述

很多数组边界检查的减慢速度，这是特别真实的二维数组。有没有一种方法来在F＃中写的不安全code块？

A lot of array boundary checking slows down the speed, this is especially true to 2D arrays. Is there a way to write unsafe code blocks in F#?

推荐答案

我不是一个的 F＃程序员，但据我可以看到它似乎不具备的不安全关键字。

I'm not a F# programmer but as far as I can see it doesn't seem to have the unsafe keyword.

你可能得到的性能提升了二维数组转化为一个一维数组。

You could possibly get a performance boost by transforming the 2D array to an one-dimensional array.

建议5：直到我们得到这个权利，我   将表明.NET用户做什么   许多C ++程序员的数值做：   写一个类来实现你的   n维阵列。这将是   重新presented作为1维阵列   和有关的访问会   通过转换n个索引为1   适当的乘法。我们   几乎可以肯定不会消除   边界检查到一维数组，   但至少我们会只做一查！

Advice 5: Until we get this right, I would suggest that .NET users do what many C++ numerical programmers do: write a class to implement your n-dimensional array. This would be represented as a 1-dimensional array, and the relevant accessors would convert n indices into 1 via appropriate multiplications. We almost certainly wouldn’t eliminate the bounds check into the 1-d array, but at least we’d only do one check!

<一个href="http://blogs.msdn.com/b/clr$c$cgeneration/archive/2009/08/13/array-bounds-check-elimination-in-the-clr.aspx">Array边界检查消除在CLR

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