c ++中的模板，typename和类 [英] Templates in c++,typename and class

问题描述

使用以下两种方式在c ++中编写模板有什么区别

What is the difference between writing a template in c++ in the below both ways

模板< typename T> & 模板< class T>

如果两者都是相同的，那么为什么我们有它们呢？

and when do we prefer them above each other? If both are same,then why do we have them both if one is enough?

推荐答案

。我喜欢第一个（大多数），但这是我个人的品味。

No difference at all. I prefer first one (mostly), but that is my personal taste. The language doesn't make any difference between them.

对于模板参数，关键字 typename 和 class 是等价的。 §14.1.2说：

For template parameters, the keywords typename and class are equivalent. §14.1.2 says:

模板参数中类和typename之间没有语义差异
。

There is no semantic difference between class and typename in a template-parameter.

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如果两者相同，

If both are same,then why do we have them both if one is enough?

Stan Lippman在他的文章中解释了这一点：

Stan Lippman explains this in his article:

为什么C ++支持类和类型名类型参数？

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