类适配器

#include <queue>
#include <iostream>
#include <algorithm>
#include <iterator>

using namespace std;

// 目标接口
class Target
{
  public:
    virtual ~Target() {}
    virtual void method() = 0;
};

// 适配者类
class Adaptee
{
  public:
    void spec_method()
    {
        std::cout << "spec_method run" << std::endl;
    }
};

// 类适配器
class Adapter : public Target, public Adaptee
{
  public:
    void method() override
    {
        std::cout << "call from Adapter: " << std::endl;
        spec_method();
    }
};

int main(int argc, char** argv)
{
    Adaptee adaptee;
    adaptee.spec_method();
    
    std::cout << std::endl;

    Adapter adapter;
    adapter.method();

    return 0;
}

对象适配器

#include <queue>
#include <iostream>
#include <algorithm>
#include <iterator>

using namespace std;

// 目标接口
class Target
{
  public:
    virtual ~Target() {}
    virtual void method() = 0;
};

// 适配者类
class Adaptee
{
  public:
    void spec_method()
    {
        std::cout << "spec_method run" << std::endl;
    }
};

// 类适配器
class Adapter : public Target
{
  public:
    Adapter(Adaptee* adaptee)
        : adaptee_{adaptee}
    {
    }

    void method() override
    {
        std::cout << "call from Adapter: " << std::endl;
        adaptee_->spec_method();
    }

  private:
    Adaptee* adaptee_;
};

int main(int argc, char** argv)
{
    Adaptee adaptee;
    adaptee.spec_method();

    std::cout << std::endl;

    Adapter adapter(&adaptee);
    adapter.method();

    return 0;
}