C++中的装饰器模式
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Decorator pattern in C++
提问by AlgoMan
Can someone give me an example of the Decorator design pattern in C++ ? I have come across the Java version of it, but found it difficult to understand the C++ version of it (from the examples I found).
有人可以给我一个 C++ 装饰器设计模式的例子吗？我遇到过它的 Java 版本，但发现很难理解它的 C++ 版本（从我发现的例子中）。
Thanks.
谢谢。
采纳答案by Matthieu M.
Vince Huston Design Patterns, even though its layout is poor, has C++ implementation for most design patterns in the Gang of Four book.
Vince Huston Design Patterns，尽管它的布局很差，但在四人组书中的大多数设计模式都有 C++ 实现。
Click for Decorator.
点击装饰器。
There isn't much difference with Java, except the manual memory handling that you'd better wrap with smart pointers :)
与 Java 没有太大区别，除了您最好用智能指针包装的手动内存处理:)
回答by Dan
I've found the website Sourcemakingto be a pretty good one when it comes to explaining different Design Patterns.
在解释不同的设计模式时，我发现Sourcemaking网站是一个很好的网站。
The Decoratordesign pattern has C++ examples, such as an overview example, a "before and after", and an example with packet encoding/decoding.
的装饰设计图案具有C ++的例子，如一个综合性实例中，“前后”，以及与数据包编码示例/解码。
回答by Rajeev
#include <iostream>
using namespace std;
class Computer
{
public:
virtual void display()
{
cout << "I am a computer..." << endl;
}
};
class CDDrive : public Computer
{
private:
Computer* c;
public:
CDDrive(Computer* _c)
{
c = _c;
}
void display()
{
c->display();
cout << "with a CD Drive..." << endl;
}
};
class Printer : public Computer
{
private:
CDDrive* d;
public:
Printer(CDDrive* _d)
{
d = _d;
}
void display()
{
d->display();
cout << "with a printer..." << endl;
}
};
int main()
{
Computer* c = new Computer();
CDDrive* d = new CDDrive(c);
Printer* p = new Printer(d);
p->display();
}
