08 2022 档案
摘要：Code::Blocks Dev-C++ clion C-Free
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摘要：至少有一个纯虚函数 不能生成对象 模拟方法 构造和拷贝构造都使用protected修饰 析构函数设置为纯虚函数 析构函数使用protected修饰
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摘要：#include <iostream> using namespace std; void func(int a) { if(a == 0) { throw string("a is error"); throw a; } } int main() { try { func(0); } catch(
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摘要：#include <iostream> //#define NDEBUG //发行版本中，assert都会被关掉 #include <assert.h> int main() { int i = 10; assert(i > 20); return 0; } a.out: assert.cpp:7:
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摘要：#include <iostream> #include <typeinfo> int main() { int i; const std::type_info &info = typeid(int); std::cout << "typeid " << info.name() << std::en
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摘要：#include <iostream> class Base { public: Base() { func(); } ~Base() { func(); } virtual void func() { std::cout << "Base func" << std::endl; } }; clas
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摘要：#include <iostream> #include <thread> #include <mutex> std::timed_mutex mutex; void mythread() { std::chrono::milliseconds timeout(100); //100ms std::
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摘要：原子操作指“不可分割的操作”，一般针对一个变量 互斥量一般针对代码段 #include <iostream> #include <thread> #include <atomic> std::atomic<int> atomic; void add() { for(int i = 0; i < 10
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摘要：#include <iostream> #include <future> int mythread() { std::cout << "mythread " << std::this_thread::get_id() << std::endl; std::chrono::milliseconds
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摘要：#include <iostream> #include <future> int mythread() { std::cout << "mythread " << std::this_thread::get_id() << std::endl; std::chrono::milliseconds
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摘要：#include <iostream> #include <future> void mythread(std::promise<int> &promise, int arg) { std::cout << "mythread " << std::this_thread::get_id() << s
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摘要：#include <iostream> #include <future> int mythread(int arg) { std::cout << "mythread " << std::this_thread::get_id() << std::endl; std::cout << "arg "
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摘要：#include <iostream> #include <future> int mythread() { std::cout << "mythread " << std::this_thread::get_id() << std::endl; std::chrono::milliseconds
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摘要：#include <iostream> #include <mutex> #include <thread> #include <condition_variable> std::mutex mutex; std::condition_variable cond; void in_msg() { w
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摘要：#include <iostream> #include <mutex> using namespace std; class MyInstance { MyInstance(){} public: static MyInstance *getInstance() { std::call_once(
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摘要：#include <iostream> using namespace std; class MyInstance { MyInstance(){} public: static MyInstance *getInstance() { if(m_instance == NULL) { m_insta
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { std::unique_lock<std::mutex> unique(mutex); std:
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { std::unique_lock<std::mutex> unique(mutex, std::
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { std::unique_lock<std::mutex> unique(mutex, std::
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { mutex.lock(); std::unique_lock<std::mutex> uniqu
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { std::unique_lock<std::mutex> unique(mutex); std:
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摘要：#include <iostream> #include <mutex> #include <thread> void msg_func() { std::mutex mutex; while(1) { std::lock_guard<std::mutex> guard(mutex); std::c
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摘要：#include "widget.h" #include "ui_widget.h" #include <QPicture> #include <QPainter> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widg
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摘要：#include "widget.h" #include "ui_widget.h" #include <QPainter> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(th
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摘要：Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); /* 绘图设备 专门为平台做了显示的优化 */ QPixmap pixmap(300, 300); pixmap.f
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摘要：#include "widget.h" #include "ui_widget.h" #include <QDebug> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this
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摘要：void paintEvent(QPaintEvent *event) override { QPainter painter(this); painter.drawEllipse(QPoint(100, 100), 50, 50); /* 移动画家 */ painter.translate(QPo
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摘要：void paintEvent(QPaintEvent *event) override { QPainter painter(this); painter.drawEllipse(QPoint(100, 100), 50, 50); //设置抗锯齿 效率较低 painter.setRenderHi
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摘要：#ifndef WIDGET_H #define WIDGET_H #include <QWidget> #include <QPainter> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widg
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摘要：#include "widget.h" #include "ui_widget.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this); /* 安装事件过滤器 */ u
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摘要：#ifndef MYLABEL_H #define MYLABEL_H #include <QWidget> #include <QDebug> #include <QMouseEvent> #include <QEvent> #include <QLabel> namespace Ui { cla
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摘要：#ifndef MYLABEL_H #define MYLABEL_H #include <QWidget> #include <QDebug> #include <QMouseEvent> #include <QLabel> namespace Ui { class MyLabel; } clas
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摘要：#ifndef MYBUTTON_H #define MYBUTTON_H #include <QWidget> #include <QDebug> #include <QPushButton> namespace Ui { class MyButton; } class MyButton : pu
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摘要：#include "widget.h" #include "ui_widget.h" #include <QMovie> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this
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摘要： 
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摘要：#include "widget.h" #include "ui_widget.h" #include <QDebug> #include <QDialog> #include "mywidget.h" Widget::Widget(QWidget *parent) : QWidget(parent
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摘要：#include "mainwindow.h" #include "ui_mainwindow.h" #include <QDockWidget> #include <QTextEdit> MainWindow::MainWindow(QWidget *parent) : QMainWindow(p
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摘要：#ifndef WIDGET_H #define WIDGET_H #include <QWidget> QT_BEGIN_NAMESPACE namespace Ui { class Widget; } QT_END_NAMESPACE class Widget : public QWidget
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摘要：#include "widget.h" #include "ui_widget.h" #include <QDebug> Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setupUi(this
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摘要：#include "widget.h" #include "ui_widget.h" #include "mypushbutton.h" Widget::Widget(QWidget *parent) : QWidget(parent) , ui(new Ui::Widget) { ui->setu
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