eh

Convert values to bool, kind of like C, eh?

Eh roughly follows the implicit conversion rules for C to _Bool or C++ to bool, but Rust requires an explicit conversion. Integer 0, floating-point 0.0, and null pointers are false, and all other values are true.

As a Rust-specific extension, this is also implemented for Option<T> and Result<T, E>. It returns true when the ? operator would unwrap a T value, and false when ? would cause an early return.

Exclusions

Eh does not implement further boolean conversions of other languages, especially since they're not universal. For example:

• JavaScript converts NaN to false, different than C and C++ (and eh).
• JavaScript converts empty [] and {} to true, but in Python they're false.
• Many languages convert empty strings to false and non-empty strings to true, but "0" is also false in Perl and PHP.

About

The name is a play on the Canadian "eh", turning a declarative sentence into a question.

License

This project is licensed under either of

• Apache License, Version 2.0, (LICENSE-APACHE or http://www.apache.org/licenses/LICENSE-2.0)
• MIT license (LICENSE-MIT or http://opensource.org/licenses/MIT)

at your option.

Contribution

Unless you explicitly state otherwise, any contribution intentionally submitted for inclusion in eh by you, as defined in the Apache-2.0 license, shall be dual licensed as above, without any additional terms or conditions.