CPlusPlus

std::thread #include <iostream> #include <thread> #include <chrono> void f1(int n) { for (int i = 0; i < 5; ++i) { std::cout << “function f1 executing\n”; ++n; std::this_thread::sleep_for(std::chrono::milliseconds(10)); } } void f2(int& n) { for (int i = 0; i < 5; ++i) { std::cout << “function f2 executing\n”; ++n; Read more…

Constexpr : Know Value At Compile Time int main(int argc, char** argv ) { int size0; constexpr auto size1 = 10; //constexpr auto size2 = size0; //error: constexpr variable ‘size2’ must be initialized by a constant expression return 0; } Mark Function Delete To Avoid Data Type Conversion void ShowValue(double Read more…

Get field value by std::get from container We can use std::get to fetch field value from container object. It can help us to avoid use iteractor to access first or second element. #include <iostream> #include <tuple> #include <string> #include <map> #include <vector> using namespace std; using Info = std::tuple<std::string, int, Read more…

The article show demoes about use ifstream to read file written by qfile and use qfile to read file written by ofstream. Use ifstream to read file written by QFile #include <QCoreApplication> #include <QString> #include <QFile> #include <iostream> #include <fstream> int main(int argc, char *argv[]) { QCoreApplication a(argc, argv); QString Read more…