C++ emplace_back: Avoid Temporary Objects

In C++, `emplace_back` is a member function of container classes like `std::vector` and `std::deque`, used to construct a new element at the end of the container and insert it. Unlike `push_back`, `emplace_back` allows direct passing of arguments to the element’s constructor without needing to create temporary objects.

The purpose of emplace_back is to create a new element at the end of the container without needing to wrap the element’s construction parameters in a temporary object. This can improve the performance and efficiency of the code, especially when inserting a large number of elements. Additionally, emplace_back can directly call the element’s constructor, making the code more concise and readable.