The std::rc module contains reference-counted pointers that can be used in single-threaded applications. They have very little overhead, thanks to counters not being atomic counters, but this means that using them in multithreaded applications could cause data races. Thus, Rust will stop you from sending them between threads at compile time. There are two structures in this module: Rc and Weak.
An Rc is an owning pointer to the heap. This means that it's the same as a Box, except that it allows for reference-counted pointers. When the Rc goes out of scope, it will decrease by 1 the number of references, and if that count is 0, it will drop the contained object.
Since an Rc is a shared reference, it cannot be mutated, but a common ...
