2015-07-03 11:36:44
意图：
用原型实例指定创建对象的种类，并且通过拷贝这些原型创建新的对象。
结构图：来自《23种设计模式 - 郗晓勇》
实现：https://github.com/panshiqu/patterns/tree/master/Prototype
Prototype
namespace NS_PROTOTYPE {
class Prototype {
public:
Prototype() {}
virtual ~Prototype() {}
virtual Prototype *clone(void) = 0;
virtual void printSelf(void) = 0;
};
} /* namespace NS_PROTOTYPE */
ConcretePrototype1
#include "Prototype.h"
#include <iostream>
namespace NS_PROTOTYPE {
class ConcretePrototype1 : public Prototype
{
public:
ConcretePrototype1() : _index(0) {}
virtual ~ConcretePrototype1() {}
virtual Prototype *clone(void)
{
ConcretePrototype1 *prototype = new ConcretePrototype1();
prototype->setIndex(getIndex());
return prototype;
}
virtual void printSelf(void)
{
std::cout << "index: " << _index << std::endl;
}
int getIndex(void) { return _index; }
void setIndex(int index){ _index = index; }
private:
int _index;
};
} /* namespace NS_PROTOTYPE */
ConcretePrototype2
#include "Prototype.h"
#include <iostream>
namespace NS_PROTOTYPE {
class ConcretePrototype2 : public Prototype
{
public:
ConcretePrototype2() : _index("zero") {}
virtual ~ConcretePrototype2() {}
virtual Prototype *clone(void)
{
ConcretePrototype2 *prototype = new ConcretePrototype2();
prototype->setIndex(getIndex());
return prototype;
}
virtual void printSelf(void)
{
std::cout << "index: " << _index << std::endl;
}
std::string getIndex(void) { return _index; }
void setIndex(std::string index) { _index = index; }
private:
std::string _index;
};
} /* namespace NS_PROTOTYPE */
main
#include "Prototype/ConcretePrototype1.h"
#include "Prototype/ConcretePrototype2.h"
using namespace NS_PROTOTYPE;
int main(void)
{
ConcretePrototype1 *p1 = new ConcretePrototype1();
ConcretePrototype2 *p2 = new ConcretePrototype2();
p1->setIndex(10);
p2->setIndex("ten");
Prototype *cp1 = p1->clone();
Prototype *cp2 = p2->clone();
p1->printSelf();
p2->printSelf();
cp1->printSelf();
cp2->printSelf();
delete p1;
delete p2;
delete cp1;
delete cp2;
}
实现：
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