This library defines two string helper classes.

CowStr

Is a String that can be initialized to a static string or be build dynamically. Its contents can then be immutably shared. When mutation is required the string will be copied first.

SubStr

Refers to a (immutable) span inside a CowStr. Since SubStr are always immutable they store the referred span directly which makes dereferencing them faster than CowStr.

Features

• singlethreaded uses std::rc::Rc for sharing strings. Default is std::sync::Arc.