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.
Eh does not implement further boolean conversions of other languages,
especially since they're not universal. For example:
false, different than C and C++ (and eh).[] and {} to true, but in Python they're false.false and non-empty strings to true,
but "0" is also false in Perl and PHP.The name is a play on the Canadian "eh", turning a declarative sentence into a question.
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