是它的typedef指针是一个好主意？ [英] Is it a good idea to typedef pointers?

问题描述

我通过一些code看了看，发现该公约是把指针类型，如

I looked through some code and noticed that the convention was to turn pointer types like

SomeStruct*

到

typedef SomeStruct* pSomeStruct;

有什么功德呢？

推荐答案

这可以在适当的时候指针本身可以看作是一个黑箱，也就是一个数据的内部重组presentation应是风马牛不相及的code。

This can be appropriate when the pointer itself can be regarded as a "black box", that is, a piece of data whose internal representation should be irrelevant to the code.

从本质上讲，如果你的code会的从不的取消引用指针，而你只是通过它周围的API函数（有时引用），则不仅typedef的减少<$数C $ C> * 在你的code，但也表明该指针真不该插手与程序员。

Essentially, if your code will never dereference the pointer, and you just pass it around API functions (sometimes by reference), then not only does the typedef reduce the number of *s in your code, but also suggests to the programmer that the pointer shouldn't really be meddled with.

此也可以更容易地改变API中的将来在需要时，例如使用的ID，而不是一个指针（或反之亦然）。由于指针从未应该首先被废弃时，现有的code不会打破。

This also makes it easier to change the API in the future if the need arises, for instance using an ID rather than a pointer (or vice versa). Since the pointer was never supposed to be dereferenced in the first place, existing code won't break.

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