CPlusPlus

the element that the iterator points to is changed after the iterator is deleted example about std::vector::iterator. std::remove_if moves all elements with key 2 to the end of the sequence based on the condition [p.first == 2]. std::vector::erase returns an iterator pointing to the element immediately following the last element Read more…

Here is a simple example about how to use factory mode to generate different subclasses in CPlusPlus project. Class: RulerFactory: The whole project is at the following part. fac.hpp main.cpp Build and run it.

Record an experience of debugging. Here are two ways to read string and store it in std::string.One will have ‘\x00’ in std::string object, the other has not.

We want to create a file which path looks like /Folder1/Folder2/Folder3/file.txt. The parent directory Folder3 of file.txt has to be there, or the creating action will fail. Similarly, Folder2 and Folder1 need to be on the disk firstly. If you are a Linux OS user, you can use the following Read more…

The function insert of std::map would fail if the key equivalent to the one of an element already in the container.when it happens, the new element is not inserted, and return an iterator to this existing element. Demo: The update can be done successfully if we use operator [] for Read more…

The following content involves the concepts of synchronous and asynchronous. Here is a C++ class that simulates a timer. Output asynchronously. To simulate a timer for sequentially outputting numbers, we can do it like this: We cannot execute the task of rendering frames by creating a new thread in this Read more…