April 2018
Intermediate to advanced
303 pages
4h 54m
Chinese
Content preview from Effective Modern C++（中文版）
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转向现代
C++
｜
79
要点速记
•
优先选用删除函数，而非
private
未定义函数。
•
任何函数都可以删除，包括非成员函数和模板具现。
条款
12
：为意在改写的函数添加
override
声明
C++
中的面向对象编程世界是围绕着类、继承和虚函数的基础上演化出来的。在这个
世界中最基本的理念就是：在派生类中虚函数实现，会改写基类中对应虚函数的实现。
在这个前提下，一旦意识到虚函数改写这件事有多么容易出错，就不免令人沮丧。语
言的这个部分设计的，怎么说呢，简直到了向墨菲定律致敬的地步。
译注
2
由于“改写”（
override
）和“重载”（
overload
）读起来很像，尽管这是两个毫不相
干的概念，我们还是要澄清，正是虚函数改写，使得通过基类接口调用派生类函数成
为了可能：
class Base {
public:
virtual void doWork();
//
基类中的虚函数
…
};
class Derived: public Base {
public:
virtual void doWork();
//
改写了
Base::doWork
…
//
（“
virtual
”在这里可写可不写）
};
std::unique_ptr<
Base
> upb =
//
创建基类指针，指涉到派生类对象
std::make_unique<
Derived
>();
// std::make_unique
的相关信息
//
请参见条款
21
…
upb->doWork(); ...
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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.