April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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右值引用
、
移动语义和完美转发
｜
199
论就是：
0
和
NULL
都不能用作空指针以进行完美转发。不过，修正方案也颇简单：传
递
nullptr
，而非
0
或
NULL
。欲知详情，请参阅条款
8
。
仅有声明的整型
static const
成员变量
有这么个普适的规定：不需要给出类中的整型
static const
成员变量的定义，仅需
声明之。因为编译器会根据这些成员的值实施常数传播，从而就不必再为它们保留内
存。举个例子，考虑下面这段代码：
class Widget {
public:
static const std::size_t MinVals = 28;
//
给出了
MinVals
的声明
…
};
…
//
未给出
MinVals
的声明
std::vector<int> widgetData;
widgetData.reserve(
Widget::MinVals
);
//
此处用到了
MinVals
在这里，尽管
Widget::MinVals
（以下简称
Minvals
）并无定义，我们还是利用了
MinVals
来指定
widgetData
的初始容量。编译器绕过了
MinVals
缺少定义的事实
（编译器的行为是这样规定的），手法是把值
28
塞到所有提及
MinVals
之处。未为
MinVals
的值保留存储这一事实并不会带来问题。如果产生了对
MinVals
实施取址的
需求（例如，有人创建了一个指涉到
MinVals
的指针），
MinVals
就得要求存储方可
（因此指针才能够指涉到它），然后上面这段代码虽然仍能够通过编译 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.