未指定的绑定 [英] unspecified bind

问题描述

我在MSDN:并且看到列出的原型是:

And saw that the prototypes listed are:

template<class Fty, class T1, class T2, ..., class TN>
   unspecified bind(Fty fn, T1 t1, T2 t2, ..., TN tN);
template<class Ret, class Fty, class T1, class T2, ..., class TN>
   unspecified bind(Fty fn, T1 t1, T2 t2, ..., TN tN);

哪个使我感到困惑，有两个原因. 1)最后我检查了一下，MSVC没有实现可变参数模板，并且2)我的问题:unspecified词在这里是什么意思? (这似乎与未指定的行为无关.)

Which confuses me for two reasons. 1) Last I checked, MSVC didn't implement variadic templates, and 2) My question: what does the word unspecified mean there? (It doesn't seem related to unspecified behavior.)

推荐答案

返回类型中的 unspecified 表示它是未指定的类型.该标准不需要从bind返回特定类型，只要返回的类型符合该标准规定的要求即可.

The unspecified in the return type means that it is a type that is, well, unspecified. The standard does not require a particular type to be returned from bind, as long as the returned type complies with the requirements that the standard mandates.

从...开始，我不知道VS是否实现了它们，但是您会看到boost::bind的相同文档，并且它已经在不同版本的编译器中编译了一段时间，而这些版本没有可变参数模板支持...文档说明您可以传递不同类型的N参数，但这并不一定意味着只有一个模板可以执行此操作，可以按照一组1-ary，2- ary ... N-ary模板.

As of the ..., I don't know whether VS implements them or not, but you will see the same documentation for boost::bind, and it has been compiling in different compilers without variadic template support for some time already... the documentation states that you can pass N arguments of different types, but that does not necessarily mean that there is a single template that does it, it can be implemented in terms of a set of 1-ary, 2-ary... N-ary templates.

文档显示的是您预期会使用该软件的行为，而不是其实现方式的详细信息.

The documentation is showing the behavior that you can expect from using it, rather than the detail of how it is implemented.

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