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#![cfg_attr(not(feature = "std"), no_std)]
#![cfg_attr(nightly, feature(never_type))]
#![allow(clippy::unnecessary_mut_passed)] // testing correct signatures rather than actual code
#![allow(dead_code)] // some code is tested for type checking only
#[cfg(not(feature = "std"))]
extern crate alloc;
#[cfg(not(feature = "std"))]
use alloc::{borrow::ToOwned, collections::VecDeque, string::String, vec, vec::Vec};
#[cfg(feature = "std")]
use std::collections::VecDeque;
use core::{marker::PhantomData, ptr};
use derive_more::AsMut;
struct Helper(i32, f64, bool);
impl AsMut<i32> for Helper {
fn as_mut(&mut self) -> &mut i32 {
&mut self.0
}
}
impl AsMut<f64> for Helper {
fn as_mut(&mut self) -> &mut f64 {
&mut self.1
}
}
impl AsMut<bool> for Helper {
fn as_mut(&mut self) -> &mut bool {
&mut self.2
}
}
struct LifetimeHelper<'a>(i32, PhantomData<&'a ()>);
impl LifetimeHelper<'static> {
fn new(val: i32) -> Self {
Self(val, PhantomData)
}
}
impl AsMut<i32> for LifetimeHelper<'static> {
fn as_mut(&mut self) -> &mut i32 {
&mut self.0
}
}
struct ConstParamHelper<const N: usize>([i32; N]);
impl AsMut<[i32]> for ConstParamHelper<0> {
fn as_mut(&mut self) -> &mut [i32] {
self.0.as_mut()
}
}
mod single_field {
use super::*;
mod tuple {
use super::*;
#[derive(AsMut)]
struct Nothing(String);
#[test]
fn nothing() {
let mut item = Nothing("test".to_owned());
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
#[as_mut(forward)]
struct Forward(String);
#[test]
fn forward() {
let mut item = Forward("test".to_owned());
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
struct Field(#[as_mut] String);
#[test]
fn field() {
let mut item = Field("test".to_owned());
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
struct FieldForward(#[as_mut(forward)] String);
#[test]
fn field_forward() {
let mut item = FieldForward("test".to_owned());
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, f64)]
struct Types(Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for Types {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
// Asserts that the macro expansion doesn't generate an `AsMut` impl for the field type, by
// producing a trait implementations conflict error during compilation, if it does.
impl AsMut<Helper> for Types {
fn as_mut(&mut self) -> &mut Helper {
&mut self.0
}
}
#[test]
fn types() {
let mut item = Types(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, Helper)]
struct TypesWithInner(Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for TypesWithInner {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn types_with_inner() {
let mut item = TypesWithInner(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
}
type RenamedFoo = Helper;
#[derive(AsMut)]
#[as_mut(i32, RenamedFoo)]
struct TypesWithRenamedInner(Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for TypesWithRenamedInner {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn types_with_renamed_inner() {
let mut item = TypesWithRenamedInner(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
}
#[derive(AsMut)]
struct FieldTypes(#[as_mut(i32, f64)] Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypes {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
// Asserts that the macro expansion doesn't generate an `AsMut` impl for the field type, by
// producing a trait implementations conflict error during compilation, if it does.
impl AsMut<Helper> for FieldTypes {
fn as_mut(&mut self) -> &mut Helper {
&mut self.0
}
}
#[test]
fn field_types() {
let mut item = FieldTypes(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
struct FieldTypesWithInner(#[as_mut(i32, Helper)] Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypesWithInner {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn field_types_with_inner() {
let mut item = FieldTypesWithInner(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
}
#[derive(AsMut)]
struct FieldTypesWithRenamedInner(#[as_mut(i32, RenamedFoo)] Helper);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypesWithRenamedInner {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn field_types_with_renamed_inner() {
let mut item = FieldTypesWithRenamedInner(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
}
mod generic {
use super::*;
#[derive(AsMut)]
struct Nothing<T>(T);
#[test]
fn nothing() {
let mut item = Nothing("test".to_owned());
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
#[as_mut(forward)]
struct Forward<T>(T);
#[test]
fn forward() {
let mut item = Forward("test".to_owned());
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
struct Field<T>(#[as_mut] T);
#[test]
fn field() {
let mut item = Field("test".to_owned());
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
struct FieldForward<T>(#[as_mut(forward)] T);
#[test]
fn field_forward() {
let mut item = FieldForward("test".to_owned());
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, f64)]
struct Types<T>(T);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding
// to the field type, by producing a trait implementations conflict error during
// compilation, if it does.
impl<T: AsMut<bool>> AsMut<bool> for Types<T> {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn types() {
let mut item = Types(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
#[as_mut(Vec<T>)]
struct TypesInner<T>(Vec<T>);
#[test]
fn types_inner() {
let mut item = TypesInner(vec![1i32]);
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
struct FieldTypes<T>(#[as_mut(i32, f64)] T);
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding
// to the field type, by producing a trait implementations conflict error during
// compilation, if it does.
impl<T: AsMut<bool>> AsMut<bool> for FieldTypes<T> {
fn as_mut(&mut self) -> &mut bool {
self.0.as_mut()
}
}
#[test]
fn field_types() {
let mut item = FieldTypes(Helper(1, 2.0, false));
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
struct FieldTypesInner<T>(#[as_mut(Vec<T>)] Vec<T>);
#[test]
fn field_types_inner() {
let mut item = FieldTypesInner(vec![1i32]);
assert!(ptr::eq(item.as_mut(), &mut item.0));
}
#[derive(AsMut)]
#[as_mut(i32)]
struct Lifetime<'a>(LifetimeHelper<'a>);
#[test]
fn lifetime() {
let mut item = Lifetime(LifetimeHelper::new(0));
assert!(ptr::eq(item.as_mut(), item.0.as_mut()));
}
#[derive(AsMut)]
struct FieldLifetime<'a>(#[as_mut(i32)] LifetimeHelper<'a>);
#[test]
fn field_lifetime() {
let mut item = FieldLifetime(LifetimeHelper::new(0));
assert!(ptr::eq(item.as_mut(), item.0.as_mut()));
}
#[derive(AsMut)]
#[as_mut([i32])]
struct ConstParam<const N: usize>(ConstParamHelper<N>);
#[test]
fn const_param() {
let mut item = ConstParam(ConstParamHelper([]));
assert!(ptr::eq(item.as_mut(), item.0.as_mut()));
}
#[derive(AsMut)]
struct FieldConstParam<const N: usize>(
#[as_mut([i32])] ConstParamHelper<N>,
);
#[test]
fn field_const_param() {
let mut item = FieldConstParam(ConstParamHelper([]));
assert!(ptr::eq(item.as_mut(), item.0.as_mut()));
}
}
#[cfg(nightly)]
mod never {
use super::*;
#[derive(AsMut)]
struct Nothing(!);
}
}
mod named {
use super::*;
#[derive(AsMut)]
struct Nothing {
first: String,
}
#[test]
fn nothing() {
let mut item = Nothing {
first: "test".to_owned(),
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
#[as_mut(forward)]
struct Forward {
first: String,
}
#[test]
fn forward() {
let mut item = Forward {
first: "test".to_owned(),
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
struct Field {
#[as_mut]
first: String,
}
#[test]
fn field() {
let mut item = Field {
first: "test".to_owned(),
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
struct FieldForward {
#[as_mut(forward)]
first: String,
}
#[test]
fn field_forward() {
let mut item = FieldForward {
first: "test".to_owned(),
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, f64)]
struct Types {
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for Types {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
// Asserts that the macro expansion doesn't generate an `AsMut` impl for the field type, by
// producing a trait implementations conflict error during compilation, if it does.
impl AsMut<Helper> for Types {
fn as_mut(&mut self) -> &mut Helper {
&mut self.first
}
}
#[test]
fn types() {
let mut item = Types {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, Helper)]
struct TypesWithInner {
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for TypesWithInner {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn types_with_inner() {
let mut item = TypesWithInner {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
}
type RenamedFoo = Helper;
#[derive(AsMut)]
#[as_mut(i32, RenamedFoo)]
struct TypesWithRenamedInner {
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for TypesWithRenamedInner {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn types_with_renamed_inner() {
let mut item = TypesWithRenamedInner {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
}
#[derive(AsMut)]
struct FieldTypes {
#[as_mut(i32, f64)]
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypes {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
// Asserts that the macro expansion doesn't generate an `AsMut` impl for the field type, by
// producing a trait implementations conflict error during compilation, if it does.
impl AsMut<Helper> for FieldTypes {
fn as_mut(&mut self) -> &mut Helper {
&mut self.first
}
}
#[test]
fn field_types() {
let mut item = FieldTypes {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
struct FieldTypesWithInner {
#[as_mut(i32, Helper)]
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypesWithInner {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn field_types_with_inner() {
let mut item = FieldTypesWithInner {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
}
#[derive(AsMut)]
struct FieldTypesWithRenamedInner {
#[as_mut(i32, RenamedFoo)]
first: Helper,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding to
// the field type, by producing a trait implementations conflict error during compilation,
// if it does.
impl AsMut<bool> for FieldTypesWithRenamedInner {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn field_types_with_renamed_inner() {
let mut item = FieldTypesWithRenamedInner {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut Helper = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
}
mod generic {
use super::*;
#[derive(AsMut)]
struct Nothing<T> {
first: T,
}
#[test]
fn nothing() {
let mut item = Nothing {
first: "test".to_owned(),
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
#[as_mut(forward)]
struct Forward<T> {
first: T,
}
#[test]
fn struct_forward() {
let mut item = Forward {
first: "test".to_owned(),
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
struct Field<T> {
#[as_mut]
first: T,
}
#[test]
fn field() {
let mut item = Field {
first: "test".to_owned(),
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
struct FieldForward<T> {
#[as_mut(forward)]
first: T,
}
#[test]
fn field_forward() {
let mut item = FieldForward {
first: "test".to_owned(),
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
#[as_mut(i32, f64)]
struct Types<T> {
first: T,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding
// to the field type, by producing a trait implementations conflict error during
// compilation, if it does.
impl<T: AsMut<bool>> AsMut<bool> for Types<T> {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn types() {
let mut item = Types {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
#[as_mut(Vec<T>)]
struct TypesInner<T> {
first: Vec<T>,
}
#[test]
fn types_inner() {
let mut item = TypesInner { first: vec![1i32] };
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
struct FieldTypes<T> {
#[as_mut(i32, f64)]
first: T,
}
// Asserts that the macro expansion doesn't generate a blanket `AsMut` impl forwarding
// to the field type, by producing a trait implementations conflict error during
// compilation, if it does.
impl<T: AsMut<bool>> AsMut<bool> for FieldTypes<T> {
fn as_mut(&mut self) -> &mut bool {
self.first.as_mut()
}
}
#[test]
fn field_types() {
let mut item = FieldTypes {
first: Helper(1, 2.0, false),
};
let rf: &mut i32 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut f64 = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
struct FieldTypesInner<T> {
#[as_mut(Vec<T>)]
first: Vec<T>,
}
#[test]
fn field_types_inner() {
let mut item = FieldTypesInner { first: vec![1i32] };
assert!(ptr::eq(item.as_mut(), &mut item.first));
}
#[derive(AsMut)]
#[as_mut(i32)]
struct Lifetime<'a> {
first: LifetimeHelper<'a>,
}
#[test]
fn lifetime() {
let mut item = Lifetime {
first: LifetimeHelper::new(0),
};
assert!(ptr::eq(item.as_mut(), item.first.as_mut()));
}
#[derive(AsMut)]
struct FieldLifetime<'a> {
#[as_mut(i32)]
first: LifetimeHelper<'a>,
}
#[test]
fn field_lifetime() {
let mut item = FieldLifetime {
first: LifetimeHelper::new(0),
};
assert!(ptr::eq(item.as_mut(), item.first.as_mut()));
}
#[derive(AsMut)]
#[as_mut([i32])]
struct ConstParam<const N: usize> {
first: ConstParamHelper<N>,
}
#[test]
fn const_param() {
let mut item = ConstParam {
first: ConstParamHelper([]),
};
assert!(ptr::eq(item.as_mut(), item.first.as_mut()));
}
#[derive(AsMut)]
struct FieldConstParam<const N: usize> {
#[as_mut([i32])]
first: ConstParamHelper<N>,
}
#[test]
fn field_const_param() {
let mut item = FieldConstParam {
first: ConstParamHelper([]),
};
assert!(ptr::eq(item.as_mut(), item.first.as_mut()));
}
}
#[cfg(nightly)]
mod never {
use super::*;
#[derive(AsMut)]
struct Nothing {
first: !,
}
}
}
}
mod multi_field {
use super::*;
mod tuple {
use super::*;
#[derive(AsMut)]
struct Nothing(String, i32);
#[test]
fn nothing() {
let mut item = Nothing("test".to_owned(), 0);
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct Skip(String, i32, #[as_mut(skip)] f64);
// Asserts that the macro expansion doesn't generate `AsMut` impl for the skipped field, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<f64> for Skip {
fn as_mut(&mut self) -> &mut f64 {
&mut self.2
}
}
#[test]
fn skip() {
let mut item = Skip("test".to_owned(), 0, 0.0);
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct Field(#[as_mut] String, #[as_mut] i32, f64);
// Asserts that the macro expansion doesn't generate `AsMut` impl for the third field, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<f64> for Field {
fn as_mut(&mut self) -> &mut f64 {
&mut self.2
}
}
#[test]
fn field() {
let mut item = Field("test".to_owned(), 0, 0.0);
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct FieldForward(#[as_mut(forward)] String, i32);
#[test]
fn field_forward() {
let mut item = FieldForward("test".to_owned(), 0);
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
type RenamedString = String;
#[derive(AsMut)]
struct Types(
#[as_mut(str, RenamedString)] String,
#[as_mut([u8])] Vec<u8>,
);
// Asserts that the macro expansion doesn't generate `AsMut` impl for the field type, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<Vec<u8>> for Types {
fn as_mut(&mut self) -> &mut Vec<u8> {
&mut self.1
}
}
#[test]
fn types() {
let mut item = Types("test".to_owned(), vec![0]);
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut String = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
let rf: &mut [u8] = item.as_mut();
assert!(ptr::eq(rf, item.1.as_mut()));
}
mod generic {
use super::*;
#[derive(AsMut)]
struct Nothing<T, U>(Vec<T>, VecDeque<U>);
#[test]
fn nothing() {
let mut item = Nothing(vec![1], VecDeque::from([2]));
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct Skip<T, U, V>(Vec<T>, VecDeque<U>, #[as_mut(skip)] V);
#[test]
fn skip() {
let mut item = Skip(vec![1], VecDeque::from([2]), 0);
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct Field<T, U, V>(#[as_mut] Vec<T>, #[as_mut] VecDeque<U>, V);
#[test]
fn field() {
let mut item = Field(vec![1], VecDeque::from([2]), 0);
assert!(ptr::eq(item.as_mut(), &mut item.0));
assert!(ptr::eq(item.as_mut(), &mut item.1));
}
#[derive(AsMut)]
struct FieldForward<T, U>(#[as_mut(forward)] T, U);
#[test]
fn field_forward() {
let mut item = FieldForward("test".to_owned(), 0);
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
}
#[derive(AsMut)]
struct Types<T, U>(#[as_mut(str)] T, #[as_mut([u8])] U);
#[test]
fn types() {
let mut item = Types("test".to_owned(), vec![0]);
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut [u8] = item.as_mut();
assert!(ptr::eq(rf, item.1.as_mut()));
}
#[derive(AsMut)]
struct TypesWithInner<T, U>(
#[as_mut(Vec<T>, [T])] Vec<T>,
#[as_mut(str)] U,
);
#[test]
fn types_with_inner() {
let mut item = TypesWithInner(vec![1i32], "a".to_owned());
let rf: &mut Vec<i32> = item.as_mut();
assert!(ptr::eq(rf, &mut item.0));
let rf: &mut [i32] = item.as_mut();
assert!(ptr::eq(rf, item.0.as_mut()));
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.1.as_mut()));
}
#[derive(AsMut)]
struct FieldNonGeneric<T>(#[as_mut([T])] Vec<i32>, T);
#[test]
fn field_non_generic() {
let mut item = FieldNonGeneric(vec![], 2i32);
assert!(ptr::eq(item.as_mut(), item.0.as_mut()));
}
}
#[cfg(nightly)]
mod never {
use super::*;
#[derive(AsMut)]
struct Nothing(String, !);
}
}
mod named {
use super::*;
#[derive(AsMut)]
struct Nothing {
first: String,
second: i32,
}
#[test]
fn nothing() {
let mut item = Nothing {
first: "test".to_owned(),
second: 0,
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct Skip {
first: String,
second: i32,
#[as_mut(skip)]
third: f64,
}
// Asserts that the macro expansion doesn't generate `AsMut` impl for the skipped field, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<f64> for Skip {
fn as_mut(&mut self) -> &mut f64 {
&mut self.third
}
}
#[test]
fn skip() {
let mut item = Skip {
first: "test".to_owned(),
second: 0,
third: 0.0,
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct Field {
#[as_mut]
first: String,
#[as_mut]
second: i32,
third: f64,
}
// Asserts that the macro expansion doesn't generate `AsMut` impl for the `third` field, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<f64> for Field {
fn as_mut(&mut self) -> &mut f64 {
&mut self.third
}
}
#[test]
fn field() {
let mut item = Field {
first: "test".to_owned(),
second: 0,
third: 0.0,
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct FieldForward {
#[as_mut(forward)]
first: String,
second: i32,
}
#[test]
fn field_forward() {
let mut item = FieldForward {
first: "test".to_owned(),
second: 0,
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
type RenamedString = String;
#[derive(AsMut)]
struct Types {
#[as_mut(str, RenamedString)]
first: String,
#[as_mut([u8])]
second: Vec<u8>,
}
// Asserts that the macro expansion doesn't generate `AsMut` impl for unmentioned type, by
// producing trait implementations conflict error during compilation, if it does.
impl AsMut<Vec<u8>> for Types {
fn as_mut(&mut self) -> &mut Vec<u8> {
&mut self.second
}
}
#[test]
fn types() {
let mut item = Types {
first: "test".to_owned(),
second: vec![0],
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut String = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
let rf: &mut [u8] = item.as_mut();
assert!(ptr::eq(rf, item.second.as_mut()));
}
mod generic {
use super::*;
#[derive(AsMut)]
struct Nothing<T, U> {
first: Vec<T>,
second: VecDeque<U>,
}
#[test]
fn nothing() {
let mut item = Nothing {
first: vec![1],
second: VecDeque::from([2]),
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct Skip<T, U, V> {
first: Vec<T>,
second: VecDeque<U>,
#[as_mut(skip)]
third: V,
}
#[test]
fn skip() {
let mut item = Skip {
first: vec![1],
second: VecDeque::from([2]),
third: 0,
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct Field<T, U, V> {
#[as_mut]
first: Vec<T>,
#[as_mut]
second: VecDeque<U>,
third: V,
}
#[test]
fn field() {
let mut item = Field {
first: vec![1],
second: VecDeque::from([2]),
third: 0,
};
assert!(ptr::eq(item.as_mut(), &mut item.first));
assert!(ptr::eq(item.as_mut(), &mut item.second));
}
#[derive(AsMut)]
struct FieldForward<T, U> {
#[as_mut(forward)]
first: T,
second: U,
}
#[test]
fn field_forward() {
let mut item = FieldForward {
first: "test".to_owned(),
second: 0,
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
}
#[derive(AsMut)]
struct Types<T, U> {
#[as_mut(str)]
first: T,
#[as_mut([u8])]
second: U,
}
#[test]
fn types() {
let mut item = Types {
first: "test".to_owned(),
second: vec![0],
};
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut [u8] = item.as_mut();
assert!(ptr::eq(rf, item.second.as_mut()));
}
#[derive(AsMut)]
struct TypesWithInner<T, U> {
#[as_mut(Vec<T>, [T])]
first: Vec<T>,
#[as_mut(str)]
second: U,
}
#[test]
fn types_inner() {
let mut item = TypesWithInner {
first: vec![1i32],
second: "a".to_owned(),
};
let rf: &mut Vec<i32> = item.as_mut();
assert!(ptr::eq(rf, &mut item.first));
let rf: &mut [i32] = item.as_mut();
assert!(ptr::eq(rf, item.first.as_mut()));
let rf: &mut str = item.as_mut();
assert!(ptr::eq(rf, item.second.as_mut()));
}
#[derive(AsMut)]
struct FieldNonGeneric<T> {
#[as_mut([T])]
first: Vec<i32>,
second: T,
}
#[test]
fn field_non_generic() {
let mut item = FieldNonGeneric {
first: vec![],
second: 2i32,
};
assert!(ptr::eq(item.as_mut(), item.first.as_mut()));
}
}
#[cfg(nightly)]
mod never {
use super::*;
#[derive(AsMut)]
struct Nothing {
first: !,
second: i32,
}
}
}
}