This crate exports two macros, which are intended to replicate the functionality of Swift's guard
expression with Option<T> usage. They both do similar things, but the ward! macro technically
has more use cases than the guard! macro, because it returns a value instead of creating a
variable.
```rust let sut = Some("test");
// This creates the variable res, which from an Option
The ward! macro, by comparison, just returns the value, without forcing you to make a variable
from it (although we still do in this example):
rust
let sut = Some("test");
let res = ward!(sut);
assert_eq!("test", res);
Both macros also support an else branch, which will run before the method returns early:
rust
let sut = None;
guard!(let _res = sut, else {
println!("This will be called!");
});
unreachable!();
Both macros also support an alternative "early return statement", which will let you e.g. break in loops:
rust
// Not that you couldn't (and probably should) do this case with `while let Some(res) = sut`...
let mut sut = Some(0);
loop {
let res = ward!(sut, break);
sut = if res < 5 {
Some(res + 1)
} else {
None
}
}
assert_eq!(sut, None);