完美的转发-这是什么一回事？ [英] Perfect forwarding - what's it all about?

问题描述

可能重复：

使用转发的优势

有人可以向我解释什么是完美的

Could someone please explain to me what perfect forwarding is about?

推荐答案

http://www.justsoftwaresolutions.co.uk/cplusplus/rvalue_references_and_perfect_forwarding.html

为什么有用？好吧，这意味着函数模板可以使用std :: forward将其参数传递给另一个函数，同时保留函数参数的左值/右值性质。这称为完美转发，避免了过度复制，并避免了模板作者必须为lvalue和rvalue引用编写多个重载。

Why is this useful? Well, it means that a function template can pass its arguments through to another function whilst retaining the lvalue/rvalue nature of the function arguments by using std::forward. This is called "perfect forwarding", avoids excessive copying, and avoids the template author having to write multiple overloads for lvalue and rvalue references.

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