学校网站建设需求分析,做响应式网站最大宽度,led的网站建设,做网站用python好还是PHP好实现: 1) cImage:抽象类; cImageReal:派生类, 不可直接实例化; cImageProxy:派生代理类, 可直接实例化用来代理cImageReal; NOTICE:派生代理类用来简化对特定派生类的使用. 使用: 实例化代理类, 然后使用. 1) 设计框架 /*image.hpp*/ #pragma once #…实现:     1) cImage:抽象类;        cImageReal:派生类, 不可直接实例化;        cImageProxy:派生代理类, 可直接实例化用来代理cImageReal;     NOTICE:派生代理类用来简化对特定派生类的使用. 使用:     实例化代理类, 然后使用. 1) 设计框架 /*image.hpp*/ #pragma once #ifndef __IMAGE__HPP #define __IMAGE__HPP #include stringnamespace __proxy{class cImage{ public:virtual ~cImage(); protected: cImage(); public:virtual void display() 0; };} #include image_real_proxy.hpp#endif/*image_real_proxy.hpp*/ #pragma once #ifndef __IMAGE_REAL_PROXY_HPP #define __IMAGE_REAL_PROXY_HPP #include image.hpp #include stringnamespace __proxy{class cImageReal:virtual public cImage{ public:cImageReal(std::string const filename); public:void display() override; private:void loadFromDisk(std::string const filename);std::string _M_filename; };}namespace __proxy{class cImageProxy:virtual public cImage{ public:cImageProxy(std::string const filename); public:void display() override; private:cImageReal *_M_image nullptr;std::string _M_filename; };} #endif2) 实现框架 /*image.cpp*/ #include image.hpp #include stdio.hnamespace __proxy{cImage::~cImage() {} cImage::cImage() {}}/*image_real_proxy.cpp*/ #include image_real_proxy.hpp #include stdio.hnamespace __proxy{cImageReal::cImageReal(std::string const filename) {_M_filename filename;loadFromDisk(_M_filename); } void cImageReal::display() {printf(Displaying %s\n, _M_filename.c_str() ); } void cImageReal::loadFromDisk(std::string const filename) {printf(Loading %s ... ok!\n, _M_filename.c_str() ); }}namespace __proxy{cImageProxy::cImageProxy(std::string const filename) {_M_filename filename; } void cImageProxy::display() {if( nullptr _M_image ){_M_image new cImageReal(_M_filename);}if( _M_image ! nullptr){_M_image-display();} }} 3) 用户使用 #include image.hpp #include cstdlib #include cstdioint main(int argc, char *argv[]) {if( argc ! (1 1) ){fprintf(stderr, Usage:%s display-times\n, argv[0]);return EXIT_FAILURE;}long long DISPLAY_TIMES atoll(argv[1]);__proxy::cImage *image new __proxy::cImageProxy(test_18mb.jpg);if( image ! NULL){printf(---------------------------------\n);image-display();printf(---------------------------------\n);for(long long idisp 1; idisp DISPLAY_TIMES; idisp ){image-display();}delete image, image NULL;}return EXIT_SUCCESS; }4) 编译与运行