CPlusPlus
Import Iconv Library Into C++ Project To Convert Charset
If you are on linux os, you needn’t add library setting in CMakeLists.txt. The libray iconv files has been inside system path. main.cpp
CMake
Use CMake To Import Shared Library Or Static Library
We need to configure project in the project file CMakeLists.txt to support to use shared library or static library.Here is an example to build a project based on the library uchardet. Use shared library Use static library
CPlusPlus
std::thread and std::mutex
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…
CPlusPlus
CPlusPlus – Constexpr, Delete, Right Value Reference
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…
CPlusPlus
Get Field Value By `std::get` From Container
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…
CPlusPlus
File IO Between QFile And std fstream
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…
CPlusPlus
C++: Save Data To A Local File That Humans Can’t Read – Binary Format
The article is similar to my old post C++: Save Data To A Local File That Humans Can Read. I want to save a little data into a local file that human can’t read it. It is best done conveniently through C Plus Plus.The following example shows the entire logic. Read more…
CPlusPlus
Rotate Vector To Orthogonal Direction
Rotate Vector To Orthogonal Direction Just like in the picture, we will rotate vector to which is orthogonal to the neighbor . The vector is the cross product of and . #include <iostream> #include “point.hpp” int main() { Point m( 1, 0, 0 ); Point n( 1, 0.5, 0 ); Read more…
CMake
C++ : Create Same BasicIO Functions For Cross-platform Compatibility
I write a few file IO functions which are used in windows and mac os x. bool CopyAFile(const std::string inFile, const std::string outFile); bool RemoveFile(const std::string filePath); void RemoveDir(const std::string folderPath); void MoveAFile(const std::string oldFile, const std::string newFile); void CheckFolderExist(const std::string folderPath); bool FileExists( const std::string path ); void HandleLastSlash( Read more…