#include<iostream>#include<string>#include<memory>// 抽象主题类classSubject{public:virtualvoidrequest()=0;};// 真实主题类classRealSubject:publicSubject{public:RealSubject(conststd::string&name){this->name=name;}virtualvoidrequest(){std::cout<<"RealSubject "<<this->name<<" is handling the re...
5 这里贴一段简单的测试代码，表明我们成功的在一般的C++代码中使用了Qt的特性。项目树如下：6 //main.h#ifndef MAIN_H#define MAIN_H#include <QObject>#include <QtCore/QDebug>#include <QString>#include <iostream>#include <string>using std::cin;using std::cout;using std::endl;#endif // MAIN...
而std::multimap在插入或删除元素时,可能会导致迭代器失效,需要重新获取迭代器。 查找性能:QMultiMap和std::multimap在查找操作上都具有较好的性能,平均时间复杂度为O(log n),但在极端情况下,QMultiMap的查找性能可能略优于std::multimap,因为QMultiMap的内部实现使用了更多的指针,可以更快地访问节点。 插入性能:由于Q...
#include<iostream>#include<memory>#include<string>// 抽象处理器类classHandler{public:virtual~Handler(){}// 处理请求的方法virtualvoidHandleRequest(conststd::string&request){if(successor_){successor_->HandleRequest(request);}}// 设置后继处理器voidsetSuccessor(std::shared_ptr<Handler>successor){succe...
#include <iostream> #include <QFile> #include <QImage> #include <QMap> #include <QColor> class C { public: C(quint32 value = 0) : value(value) { } // Override operator << and >>. friend QDataStream &operator<<(QDataStream &out, const C &obj); ...
#include<iostream> #include<QDebug> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QHash<int, QString> hash; hash.insert(0, "working"); hash.insert(1, "hard"); hash.insert(2, "!"); QString str("this is a QDataStream test "); ...
#include "sigslot.h" #include<iostream> using namespace std; class window { //发送信号的类 public: //定义一些信号 sigslot::signal0<>sig_button_click; sigslot::signal1<int>sig_print; //在sibgslot中,signal0表示不带任何参数的信号,signal1表示带一个参数的信号 }; class handle_signal :publ...
#include <iostream> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); std::cout << "测试代码"<<std::endl; qDebug() << "测试代码"<< endl; } Widget::~Widget() { delete ui;
#include <iostream> #include <QPushButton> // 设置函数,用于绑定事件 void Print() { std::cout << "hello lyshark" << std::endl; } MainWindow::MainWindow(QWidget *parent): QMainWindow(parent), ui(new Ui::MainWindow) { ui->setupUi(this); ...
#include<QCoreApplication>#include<iostream>#include<QString>#include<QtGlobal>#include<QMap>#include<QMapIterator>intmain(int argc,char*argv[]){QCoreApplicationa(argc,argv);QMap<QString,QString>map;map["1001"]="admin";map["1002"]="guest";map.insert("1003","lyshark");map.insert("1004...