• 简单工厂模式

#include <iostream>

using namespace std;

enum CpuType
{
    A, B
};

class CPU
{
public:
    virtual void work() = 0;
};

class CpuA : public CPU
{
public:
    virtual void work()
    {
        cout << "CpuA work()" << endl;
    }
};

class CpuB : public CPU
{
public:
    virtual void work()
    {
        cout << "CpuB work()" << endl;
    }
};

class Facty
{
public:
    CPU* createCpu(enum CpuType type)
    {
        if (type == A) return new CpuA();
        else if (type == B) return new CpuB();
    }
};

int main()
{
    Facty fty;
    CPU* pcpu = fty.createCpu(A);
    pcpu->work();

    pcpu = fty.createCpu(B);
    pcpu->work();

    return 0;
}

• 复杂工厂模式

#include <iostream>

using namespace std;

class Cpu
{
public:
    virtual void work() = 0;
};

class CpuA : public Cpu
{
public:
    void work()
    {
        cout << "CpuA work()" << endl;
    }
};

class CpuB : public Cpu
{
public:
    void work()
    {
        cout << "CpuB work()" << endl;
    }
};

class Facty
{
public:
    virtual Cpu* createCpu() = 0;
};

class FactyA : public Facty
{
public:
    Cpu* createCpu()
    {
        return new CpuA;
    }
};

class FactyB : public Facty
{
public:
    Cpu* createCpu()
    {
        return new CpuB;
    }
};

int main()
{
    FactyA ftya;
    Cpu* pcpu = ftya.createCpu();
    pcpu->work();

    FactyB ftyb;
    pcpu = ftyb.createCpu();
    pcpu->work();

    return 0;
}