Struct implementation::Impl

pub struct Impl<T>(_);

Wrapper type for targeting and accessing actual implementation.

Impl has smart-pointer capabilities, as it implements std::ops::Deref and std::ops::DerefMut. You may freely choose what kind of T you want to wrap. It may be an owned one or it could be a &T. Each have different tradeoffs.

An owned T is the most flexible in implementations, but that requires always owning “sub-implementations” through an Impl:

use implementation::Impl;

struct MyConfig {
    param1: i32,
    sub_config: Impl<SubConfig>,
}

struct SubConfig {
    param2: i32,
}

A referenced &T makes it possible to borrow an Impl from any T, but that could prove to be more troublesome in some implementations. This also will require a reference-within-reference design in trait methods with a &self receiver, and some more boilerplate if it needs to be cloned:

use implementation::Impl;

trait DoSomething {
    fn something(&self);
}

impl<'t, T> DoSomething for Impl<&'t T>
    where T: Clone + Send + 'static
{
    // self is an `&Impl<&T>`:
    fn something(&self) {

        // it will require some more code to make a proper clone of T:
        let t_clone = self.into_inner().clone();

        let handle = std::thread::spawn(move || {
            let implementation = Impl::new(&t_clone);

            // Do something else with Impl<&T>
        });

        handle.join().unwrap();
    }
}

Implementations

impl<T> Impl<T>

pub fn new(value: T) -> Impl<T>

Construct a new Impl.

pub fn into_inner(self) -> T

Trait Implementations

impl<T> AsRef<T> for Impl<T>

fn as_ref(&self) -> &T

Converts this type into a shared reference of the (usually inferred) input type.

impl<T: Clone> Clone for Impl<T>

fn clone(&self) -> Impl<T>

Returns a copy of the value.

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

Performs copy-assignment from source.

impl<T: Debug> Debug for Impl<T>

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

Formats the value using the given formatter.

impl<T: Default> Default for Impl<T>

fn default() -> Impl<T>

Returns the “default value” for a type.

impl<T> Deref for Impl<T>

type Target = T

The resulting type after dereferencing.

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

Dereferences the value.

impl<T> DerefMut for Impl<T>

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

Mutably dereferences the value.

impl<T> From<T> for Impl<T>

fn from(value: T) -> Impl<T>

Converts to this type from the input type.

impl<T: Hash> Hash for Impl<T>

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl<T: Ord> Ord for Impl<T>

fn cmp(&self, other: &Impl<T>) -> Ordering

This method returns an Ordering between self and other.

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

Compares and returns the maximum of two values.

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

Compares and returns the minimum of two values.

fn clamp(self, min: Self, max: Self) -> Selfwhere Self: Sized + PartialOrd<Self>,

Restrict a value to a certain interval.

impl<T: PartialEq> PartialEq<Impl<T>> for Impl<T>

fn eq(&self, other: &Impl<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 !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T: PartialOrd> PartialOrd<Impl<T>> for Impl<T>

fn partial_cmp(&self, other: &Impl<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: Copy> Copy for Impl<T>

impl<T: Eq> Eq for Impl<T>

impl<T> StructuralEq for Impl<T>

impl<T> StructuralPartialEq for Impl<T>