C++双地址运算符?(&&)

2022-01-07 00:00:00 operator-keyword c++ stl memory-address

我正在阅读 STL 源代码，但我不知道 && 地址运算符应该做什么.下面是来自 stl_vector.h 的代码示例:

I'm reading STL source code and I have no idea what && address operator is supposed to do. Here is a code example from stl_vector.h:

vector&
operator=(vector&& __x) // <-- Note double ampersands here
{
    // NB: DR 675.
    this->clear();
    this->swap(__x); 
    return *this;
}

地址的地址"有意义吗?为什么它有两个地址运算符而不是一个?

Does "Address of Address" make any sense? Why does it have two address operators instead of just one?

推荐答案

这是 C++11 代码.在 C++11 中，&& 标记可用于表示右值引用".

This is C++11 code. In C++11, the && token can be used to mean an "rvalue reference".

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