Getset, we're ready to go!
A procedural macro for generating the most basic getters and setters on fields.
Getters are generated as fn field(&self) -> &type, while setters are generated as fn field(&mut self, val: type).
These macros are not intended to be used on fields which require custom logic inside of their setters and getters. Just write your own in that case!
use getset::{CopyGetters, Getters, MutGetters, Setters};
#[derive(Getters, Setters, MutGetters, CopyGetters, Default)]
pub struct Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[getset(get, set, get_mut)]
private: T,
/// Doc comments are supported!
/// Multiline, even.
#[getset(get_copy = "pub", set = "pub", get_mut = "pub")]
public: T,
}
fn main() {
let mut foo = Foo::default();
foo.set_private(1);
(*foo.private_mut()) += 1;
assert_eq!(*foo.private(), 2);
}You can use cargo-expand to generate the output. Here are the functions that the above generates (Replicate with cargo expand --example simple):
use getset::{Getters, MutGetters, CopyGetters, Setters};
pub struct Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[getset(get, get, get_mut)]
private: T,
/// Doc comments are supported!
/// Multiline, even.
#[getset(get_copy = "pub", set = "pub", get_mut = "pub")]
public: T,
}
impl<T> Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[inline(always)]
fn private(&self) -> &T {
&self.private
}
}
impl<T> Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[inline(always)]
pub fn set_public(&mut self, val: T) -> &mut Self {
self.public = val;
self
}
}
impl<T> Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[inline(always)]
fn private_mut(&mut self) -> &mut T {
&mut self.private
}
/// Doc comments are supported!
/// Multiline, even.
#[inline(always)]
pub fn public_mut(&mut self) -> &mut T {
&mut self.public
}
}
impl<T> Foo<T>
where
T: Copy + Clone + Default,
{
/// Doc comments are supported!
/// Multiline, even.
#[inline(always)]
pub fn public(&self) -> T {
self.public
}
}Attributes can be set on struct level for all fields in struct as well. Field level attributes take precedence.
#[macro_use]
extern crate getset;
mod submodule {
#[derive(Getters, CopyGetters, Default)]
#[get_copy = "pub"] // By default add a pub getting for all fields.
pub struct Foo {
public: i32,
#[get_copy] // Override as private
private: i32,
}
fn demo() {
let mut foo = Foo::default();
foo.private();
}
}
fn main() {
let mut foo = submodule::Foo::default();
foo.public();
}For some purposes, it's useful to have the get_ prefix on the getters for
either legacy of compatability reasons. It is done with with_prefix.
#[macro_use]
extern crate getset;
#[derive(Getters, Default)]
pub struct Foo {
#[get = "pub with_prefix"]
field: bool,
}
fn main() {
let mut foo = Foo::default();
let val = foo.get_field();
}Skipping setters and getters generation for a field when struct level attribute is used
is possible with #[getset(skip)].
use getset::{CopyGetters, Setters};
#[derive(CopyGetters, Setters)]
#[getset(get_copy, set)]
pub struct Foo {
// If the field was not skipped, the compiler would complain about moving
// a non-copyable type in copy getter.
#[getset(skip)]
skipped: String,
field1: usize,
field2: usize,
}
impl Foo {
// It is possible to write getters and setters manually,
// possibly with a custom logic.
fn skipped(&self) -> &str {
&self.skipped
}
fn set_skipped(&mut self, val: &str) -> &mut Self {
self.skipped = val.to_string();
self
}
}
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