New features in C++ 23

C++23 brought a new and useful addition to the language: insert_range(). This new member function provides a more efficient way to insert a range of elements into a vector. Until C++23, the only way to insert a range of elements into a vector was to use a loop. For example: std::vector vec1 = {1, 2, 3, 4, 5}; std::vector vec2 = {6, 7, 8, 9, 10}; for (int i = 0; i < vec2.size(); i++) { vec1.insert(vec1.begin() + 2 + i, vec2[i]); } // Print the vector for (int i = 0; i < vec1.size(); i++) { std::cout << vec1[i] << ” “; } Our output will be: 1 2 6 7 8 9 10 3 4 5 However, especially when we use large vectors, loops could be very inefficient. When you loop through a large container, you are essentially accessing each element in the container one at a time. This can be a very slow process, especially if the container is very large. The insert_range() function solves this problem by providing a single function that can be used to insert a range of elements into a vector with a single function call. So now, instead of using the loop in our previous code, we can simply write: std::vector vec1 = {1, 2, 3, 4, 5}; std::vector vec2 = {6, 7, 8, 9, 10}; auto iter = vec1.insert_range(vec1.begin() + 2, vec2.begin(), vec2.end()); for (int i = 0; i < vec1.size(); i++) { std::cout << vec1[i] << ” “; } As you can see, we don’t need to use a loop, we simply add the new range to our vector. The new insert_range() function is a really valuable addition to the C++ language, and we expect it will be widely used. In our new book Learning C++ published by Manning Publication, we teach C++ core language features, including the newest C++23 standard.