Struct interior_mutability_pointer::Imp

pub struct Imp<T: ?Sized> { /* fields omitted */ }

A wrapper around Rc<RefCell<T>> allowing immediate access to inner methods, without the need for .borrow() or .borrow_mut(), allowing for a more seamless pointer experience.

let mut k = Imp::new(String::new());
let p = k.clone(); // Clone the pointer.
k.push_str("yo");
println!("{} {}", k, p); // Prints "yo yo"

Also allows the use of operators:

let mut k = Imp::new(5);
let p = k.clone(); // Clone the pointer.
k += 5;
println!("{} {}", k, p); // Prints "10 10"

The biggest difference to Rc<RefCell<T>> is that your pointer instance will need to be marked as mut if you want to use &mut self methods, as opposed to Rc<RefCell<T>> instances where you can call .borrow_mut(), removing the need for the mut keyword. However, this does not mean that all clones of the pointer need to be mutable!

let k = Imp::new(String::new());
let mut p = k.clone(); // Clone the pointer.
p.push_str("yo");
println!("{:?} {:?}", k, p); // Prints "yo yo"

Also supports dynamic dispatch for all your trait ojects, in both mutable and inmutable contexts!

trait Animal {
    fn sound(&self) -> &'static str;
    fn volume(&self) -> i32;
    fn set_volume(&mut self, v: i32);
}

#[derive(Clone, Copy)]
struct Sheep {
    volume: i32,
}
impl Animal for Sheep {
    fn sound(&self) -> &'static str {
        "baah"
    }

    fn volume(&self) -> i32 {
        self.volume
    }

    fn set_volume(&mut self, v: i32) {
        self.volume = v;
    }
}

#[derive(Clone, Copy)]
struct Dog {
    volume: i32,
}
impl Animal for Dog {
    fn sound(&self) -> &'static str {
        "bark"
    }

    fn volume(&self) -> i32 {
        self.volume
    }

    fn set_volume(&mut self, v: i32) {
        self.volume = v;
    }
}

let s = Sheep { volume: 10 };
let d = Dog { volume: 15 };

let mut rc_refcell: Vec<Rc<RefCell<dyn Animal>>> =
    vec![Rc::new(RefCell::new(s)), Rc::new(RefCell::new(d))];
let mut imp: Vec<Imp<dyn Animal>> = vec![Imp::new(s), Imp::new(d)];

rc_refcell.iter_mut().for_each(|a| {
    let v = a.borrow().volume();
    a.borrow_mut().set_volume(v * 2);
});

imp.iter_mut().for_each(|a| {
    let v = a.volume();
    a.set_volume(v * 2);
});

let rc_refcell = rc_refcell
    .iter()
    .map(|p| p.borrow().volume())
    .collect::<Vec<_>>();
let imp = imp.iter().map(|p| p.volume()).collect::<Vec<_>>();

println!("{:?}", rc_refcell); // Prints [20, 30]
println!("{:?}", imp);        // Prints [20, 30]

Implementations

impl<T> Imp<T>

pub fn new(t: T) -> Self

Returns a pointer to the data

Arguments

• t - The value to be pointed to.

Examples

use interior_mutability_pointer::Imp;
let p = Imp::new(String::new());
let p2 = p.clone();
p.push_str("yoo"); // Modifies the inner value of both p and p2.

pub fn ptr_eq(this: &Self, other: &Self) -> bool

Returns true if two pointers are equal

Arguments

• this - A pointer to compare
• other - The other pointer to compare to

Examples

use interior_mutability_pointer::Imp;
let p1 = Imp::new(String::new());
let p2 = p1.clone();
let p3 = Imp::new(String::new());
println!("{}", Imp::ptr_eq(&p1, &p2)); // Prints true
println!("{}", Imp::ptr_eq(&p1, &p3)); // Prints false

Trait Implementations

impl<T: Add<T> + Copy + Add<Output = T>> Add<Imp<T>> for Imp<T>

type Output = Imp<T>

The resulting type after applying the + operator.

fn add(self, other: Self) -> Self::Output

Performs the + operation.

impl<T: Add<T> + Copy + Add<Output = T>> Add<T> for Imp<T>

type Output = Imp<T>

The resulting type after applying the + operator.

fn add(self, other: T) -> Self::Output

Performs the + operation.

impl<T: AddAssign<T> + Copy + AddAssign> AddAssign<Imp<T>> for Imp<T>

fn add_assign(&mut self, other: Imp<T>)

Performs the += operation.

impl<T: AddAssign<T> + Copy + AddAssign> AddAssign<T> for Imp<T>

fn add_assign(&mut self, other: T)

Performs the += operation.

impl<T: BitAnd<T> + Copy + BitAnd<Output = T>> BitAnd<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the & operator.

fn bitand(self, other: Self) -> Self::Output

Performs the & operation.

impl<T: BitAnd<T> + Copy + BitAnd<Output = T>> BitAnd<T> for Imp<T>

type Output = Self

The resulting type after applying the & operator.

fn bitand(self, other: T) -> Self::Output

Performs the & operation.

impl<T: BitAndAssign<T> + Copy + BitAndAssign> BitAndAssign<Imp<T>> for Imp<T>

fn bitand_assign(&mut self, other: Imp<T>)

Performs the &= operation.

impl<T: BitAndAssign<T> + Copy + BitAndAssign> BitAndAssign<T> for Imp<T>

fn bitand_assign(&mut self, other: T)

Performs the &= operation.

impl<T: BitOr<T> + Copy + BitOr<Output = T>> BitOr<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the | operator.

fn bitor(self, other: Self) -> Self::Output

Performs the | operation.

impl<T: BitOr<T> + Copy + BitOr<Output = T>> BitOr<T> for Imp<T>

type Output = Self

The resulting type after applying the | operator.

fn bitor(self, other: T) -> Self::Output

Performs the | operation.

impl<T: BitOrAssign<T> + Copy + BitOrAssign> BitOrAssign<Imp<T>> for Imp<T>

fn bitor_assign(&mut self, other: Imp<T>)

Performs the |= operation.

impl<T: BitOrAssign<T> + Copy + BitOrAssign> BitOrAssign<T> for Imp<T>

fn bitor_assign(&mut self, other: T)

Performs the |= operation.

impl<T: BitXor<T> + Copy + BitXor<Output = T>> BitXor<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the ^ operator.

fn bitxor(self, other: Self) -> Self::Output

Performs the ^ operation.

impl<T: BitXor<T> + Copy + BitXor<Output = T>> BitXor<T> for Imp<T>

type Output = Self

The resulting type after applying the ^ operator.

fn bitxor(self, other: T) -> Self::Output

Performs the ^ operation.

impl<T: BitXorAssign<T> + Copy + BitXorAssign> BitXorAssign<Imp<T>> for Imp<T>

fn bitxor_assign(&mut self, other: Imp<T>)

Performs the ^= operation.

impl<T: BitXorAssign<T> + Copy + BitXorAssign> BitXorAssign<T> for Imp<T>

fn bitxor_assign(&mut self, other: T)

Performs the ^= operation.

impl<T> Clone for Imp<T>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug> Debug for Imp<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: ?Sized> Deref for Imp<T>

type Target = T

The resulting type after dereferencing.

fn deref(&self) -> &Self::Target

Dereferences the value.

impl<T: ?Sized> DerefMut for Imp<T>

fn deref_mut(&mut self) -> &mut Self::Target

Mutably dereferences the value.

impl<T: Display> Display for Imp<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl<T: Div<T> + Copy + Div<Output = T>> Div<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the / operator.

fn div(self, other: Self) -> Self::Output

Performs the / operation.

impl<T: Div<T> + Copy + Div<Output = T>> Div<T> for Imp<T>

type Output = Self

The resulting type after applying the / operator.

fn div(self, other: T) -> Self::Output

Performs the / operation.

impl<T: DivAssign<T> + Copy + DivAssign> DivAssign<Imp<T>> for Imp<T>

fn div_assign(&mut self, other: Imp<T>)

Performs the /= operation.

impl<T: DivAssign<T> + Copy + DivAssign> DivAssign<T> for Imp<T>

fn div_assign(&mut self, other: T)

Performs the /= operation.

impl<T: Index<Range<usize>>> Index<Range<usize>> for Imp<T>

type Output = T::Output

The returned type after indexing.

fn index(&self, index: Range<usize>) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<T: Index<usize>> Index<usize> for Imp<T>

type Output = T::Output

The returned type after indexing.

fn index(&self, index: usize) -> &Self::Output

Performs the indexing (container[index]) operation.

impl<T: IndexMut<Range<usize>>> IndexMut<Range<usize>> for Imp<T>

fn index_mut(&mut self, index: Range<usize>) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation.

impl<T: IndexMut<usize>> IndexMut<usize> for Imp<T>

fn index_mut(&mut self, index: usize) -> &mut Self::Output

Performs the mutable indexing (container[index]) operation.

impl<T: Mul<T> + Copy + Mul<Output = T>> Mul<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the * operator.

fn mul(self, other: Self) -> Self::Output

Performs the * operation.

impl<T: Mul<T> + Copy + Mul<Output = T>> Mul<T> for Imp<T>

type Output = Self

The resulting type after applying the * operator.

fn mul(self, other: T) -> Self::Output

Performs the * operation.

impl<T: MulAssign<T> + Copy + MulAssign> MulAssign<Imp<T>> for Imp<T>

fn mul_assign(&mut self, other: Imp<T>)

Performs the *= operation.

impl<T: MulAssign<T> + Copy + MulAssign> MulAssign<T> for Imp<T>

fn mul_assign(&mut self, other: T)

Performs the *= operation.

impl<T: Neg + Copy> Neg for Imp<T>

type Output = Imp<T::Output>

The resulting type after applying the - operator.

fn neg(self) -> Self::Output

Performs the unary - operation.

impl<T: Not + Copy> Not for Imp<T>

type Output = Imp<T::Output>

The resulting type after applying the ! operator.

fn not(self) -> Self::Output

Performs the unary ! operation.

impl<T: Ord> Ord for Imp<T>

fn cmp(&self, other: &Self) -> Ordering

This method returns an Ordering between self and other.

fn max(self, other: Self) -> Self

Compares and returns the maximum of two values.

fn min(self, other: Self) -> Self

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Self

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Imp<T>> for Imp<T>

fn eq(&self, other: &Self) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T: PartialEq> PartialEq<T> for Imp<T>

fn eq(&self, other: &T) -> bool

This method tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

This method tests for !=.

impl<T: PartialOrd> PartialOrd<Imp<T>> for Imp<T>

fn partial_cmp(&self, other: &Self) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: PartialOrd> PartialOrd<T> for Imp<T>

fn partial_cmp(&self, other: &T) -> Option<Ordering>

This method returns an ordering between self and other values if one exists.

fn lt(&self, other: &Rhs) -> bool

This method tests less than (for self and other) and is used by the < operator.

fn le(&self, other: &Rhs) -> bool

This method tests less than or equal to (for self and other) and is used by the <= operator.

fn gt(&self, other: &Rhs) -> bool

This method tests greater than (for self and other) and is used by the > operator.

fn ge(&self, other: &Rhs) -> bool

This method tests greater than or equal to (for self and other) and is used by the >= operator.

impl<T: Rem<T> + Copy + Rem<Output = T>> Rem<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the % operator.

fn rem(self, other: Self) -> Self::Output

Performs the % operation.

impl<T: Rem<T> + Copy + Rem<Output = T>> Rem<T> for Imp<T>

type Output = Self

The resulting type after applying the % operator.

fn rem(self, other: T) -> Self::Output

Performs the % operation.

impl<T: RemAssign<T> + Copy + RemAssign> RemAssign<Imp<T>> for Imp<T>

fn rem_assign(&mut self, other: Imp<T>)

Performs the %= operation.

impl<T: RemAssign<T> + Copy + RemAssign> RemAssign<T> for Imp<T>

fn rem_assign(&mut self, other: T)

Performs the %= operation.

impl<T: Shl<T> + Copy + Shl<Output = T>> Shl<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the << operator.

fn shl(self, other: Self) -> Self::Output

Performs the << operation.

impl<T: Shl<T> + Copy + Shl<Output = T>> Shl<T> for Imp<T>

type Output = Self

The resulting type after applying the << operator.

fn shl(self, other: T) -> Self::Output

Performs the << operation.

impl<T: ShlAssign<T> + Copy + ShlAssign> ShlAssign<Imp<T>> for Imp<T>

fn shl_assign(&mut self, other: Imp<T>)

Performs the <<= operation.

impl<T: ShlAssign<T> + Copy + ShlAssign> ShlAssign<T> for Imp<T>

fn shl_assign(&mut self, other: T)

Performs the <<= operation.

impl<T: Shr<T> + Copy + Shr<Output = T>> Shr<Imp<T>> for Imp<T>

type Output = Self

The resulting type after applying the >> operator.

fn shr(self, other: Self) -> Self::Output

Performs the >> operation.

impl<T: Shr<T> + Copy + Shr<Output = T>> Shr<T> for Imp<T>

type Output = Self

The resulting type after applying the >> operator.

fn shr(self, other: T) -> Self::Output

Performs the >> operation.

impl<T: ShrAssign<T> + Copy + ShrAssign> ShrAssign<Imp<T>> for Imp<T>

fn shr_assign(&mut self, other: Imp<T>)

Performs the >>= operation.

impl<T: ShrAssign<T> + Copy + ShrAssign> ShrAssign<T> for Imp<T>

fn shr_assign(&mut self, other: T)

Performs the >>= operation.

impl<T: Sub<T> + Copy + Sub<Output = T>> Sub<Imp<T>> for Imp<T>

type Output = Imp<T>

The resulting type after applying the - operator.

fn sub(self, other: Self) -> Self::Output

Performs the - operation.

impl<T: Sub<T> + Copy + Sub<Output = T>> Sub<T> for Imp<T>

type Output = Imp<T>

The resulting type after applying the - operator.

fn sub(self, other: T) -> Self::Output

Performs the - operation.

impl<T: SubAssign<T> + Copy + SubAssign> SubAssign<Imp<T>> for Imp<T>

fn sub_assign(&mut self, other: Imp<T>)

Performs the -= operation.

impl<T: SubAssign<T> + Copy + SubAssign> SubAssign<T> for Imp<T>

fn sub_assign(&mut self, other: T)

Performs the -= operation.

impl<T: ?Sized + Unsize<U>, U: ?Sized> CoerceUnsized<Imp<U>> for Imp<T>

impl<T: ?Sized + Unsize<U>, U: ?Sized> DispatchFromDyn<Imp<U>> for Imp<T>

impl<T: Eq> Eq for Imp<T>