C++0x 将不再有概念。意见？这将如何影响你？

Question

在 2009 年 7 月 C++0x meeting in Frankfurt , 决定 remove concepts来自 C++0x。就个人而言，我很失望，但我宁愿有一个可实现的 C++0x，也不愿没有 C++0x。他们说他们将在以后添加。

您对这个决定/问题有何看法？它将如何影响您？

Answer 1

就我个人而言，我对删除并不太不满意，因为概念的目的主要是改进编译时错误消息，正如概念提案的共同作者之一 Jeremy Siek 所写的 ( http://lambda-the-ultimate.org/node/3518#comment-50071 ):

While the Concepts proposal was not perfect (can any extension to C++ really ever be perfect?), it would have provided a very usable and helpful extension to the language, an extension that would drastically reduce the infamous error messages that current users of template libraries are plagued with.

当然，概念的用途不仅仅是让编译器给出更短的错误消息，但目前我认为没有它们我们都可以生活。

编辑:Herb Sutter 还在他的 blog 上写道:

Q: Wasn’t this C++0x’s one big feature?

A: No. Concepts would be great, but for most users, the presence or absence of concepts will make no difference to their experience with C++0x except for quality of error messages.

Q: Aren’t concepts about adding major new expressive power to the language, and so enable major new kinds of programs or programming styles?

A: Not really. Concepts are almost entirely about getting better error messages.