1 unstable release
0.1.0 | Jul 26, 2023 |
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#1646 in Procedural macros
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12KB
226 lines
enum_filter
enum_filter
provides a macro that will generate "filter" methods for iterators over an enum
It does so by creating a trait EnumNameFilter
with the same visibilty as the enum
For variants with named fields it will create a struct VariantNameData
, also with the same visibility as the enum
#[enum_filter]
enum Example {
Variant1,
Variant2(u8),
Variant3 { data: u8 },
}
fn main() {
let mut test_vec = vec![
Example::Variant1,
Example::Variant2(2),
Example::Variant3 { data: 3 },
];
assert_eq!(
test_vec.iter().filter_variant1().collect::<Vec<_>>(),
vec![()]
);
assert_eq!(
test_vec.iter_mut().filter_variant2().collect::<Vec<_>>(),
vec![&mut 2]
);
assert_eq!(
test_vec
.into_iter()
.filter_variant3()
.map(|v| v.data)
.collect::<Vec<_>>(),
vec![3]
);
}
lib.rs
:
enum_filter
provides a macro that will generate "filter" methods for iterators over an enum
It does so by creating a trait EnumNameFilter
with the same visibilty as the enum
For variants with named fields it will create a struct VariantNameData
, also with the same visibility as the enum
#[enum_filter]
enum Example {
Variant1,
Variant2(u8),
Variant3 { data: u8 },
}
fn main() {
let mut test_vec = vec![
Example::Variant1,
Example::Variant2(2),
Example::Variant3 { data: 3 },
];
assert_eq!(
test_vec.iter().filter_variant1().collect::<Vec<_>>(),
vec![()]
);
assert_eq!(
test_vec.iter_mut().filter_variant2().collect::<Vec<_>>(),
vec![&mut 2]
);
assert_eq!(
test_vec
.into_iter()
.filter_variant3()
.map(|v| v.data)
.collect::<Vec<_>>(),
vec![3]
);
}
Dependencies
~0.9–1.4MB
~27K SLoC