smartstring

Compact inlined strings.

tl;dr

String type that's source compatible with std::string::String, uses exactly the same amount of space, doesn't heap allocate for short strings (up to 23 bytes on 64-bit archs) by storing them in the space a String would have taken up on the stack, making strings go faster overall.

Overview

This crate provides a wrapper for Rust's standard String which uses the space a String occupies on the stack to store inline string data, automatically promoting it to a String when it grows beyond the inline capacity. This has the advantage of avoiding heap allocations for short strings as well as improving performance thanks to keeping the strings on the stack.

This is all accomplished without the need for an external discriminant, so a SmartString is exactly the same size as a String on the stack, regardless of whether it's inlined or not. Converting a heap allocated SmartString into a String and vice versa is also a zero cost operation, as one will reuse the allocated memory of the other.

Documentation

API docs

Licence

This software is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at http://mozilla.org/MPL/2.0/.

Code of Conduct