5 releases (breaking)
0.5.0 | Jan 20, 2024 |
---|---|
0.4.0 | Jan 10, 2024 |
0.3.0 | Oct 21, 2023 |
0.2.0 | Oct 19, 2023 |
0.1.0 | Oct 18, 2023 |
#1929 in Procedural macros
95 downloads per month
Used in 6 crates
(3 directly)
9KB
108 lines
A custom derive implementation for #[derive(With)]
Get started
1.Generate with-constructor for each field on named struct.
#[derive(With)]
pub struct Foo {
pub a: i32,
pub b: String,
}
This will generate code
impl Foo {
pub fn with_a(mut self, a: impl Into<i32>) -> Self {
self.a = a.into();
self
}
pub fn with_b(mut self, b: impl Into<String>) -> Self {
self.b = b.into();
self
}
}
2.Generate with-constructor for each field on tuple struct.
#[derive(With)]
pub struct Bar (i32, String);
This will generate code
impl Bar {
pub fn with_0(mut self, field_0: impl Into<i32>) -> Self {
self.0 = field_0.into();
self
}
pub fn with_1(mut self, field_1: impl Into<String>) -> Self {
self.1 = field_1.into();
self
}
}
3.Generate with-constructor for specific fields on named struct.
#[derive(With)]
#[with(a)]
pub struct Foo {
pub a: i32,
pub b: String,
}
This will generate code
impl Foo {
pub fn with_a(mut self, a: impl Into<i32>) -> Self {
self.a = a.into();
self
}
}
4.Generate with-constructor for specific fields on tuple struct.
#[derive(With)]
#[with(1)]
pub struct Bar (i32, String);
This will generate code
impl Bar {
pub fn with_1(mut self, field_1: impl Into<String>) -> Self {
self.1 = field_1.into();
self
}
}
References
Dependencies
~225–670KB
~16K SLoC