pub struct Interned<'a, T>(pub &'a T, pub PrivateZst);
Expand description

A reference to a value that is interned, and is known to be unique.

Note that it is possible to have a T and a Interned<T> that are (or refer to) equal but different values. But if you have two different Interned<T>s, they both refer to the same value, at a single location in memory. This means that equality and hashing can be done on the value’s address rather than the value’s contents, which can improve performance.

The PrivateZst field means you can pattern match with Interned(v, _) but you can only construct a Interned with new_unchecked, and not directly.

Tuple Fields

0: &'a T1: PrivateZst

Implementations

Create a new Interned value. The value referred to must be interned and thus be unique, and it must remain unique in the future. This function has _unchecked in the name but is not unsafe, because if the uniqueness condition is violated condition it will cause incorrect behaviour but will not affect memory safety.

Trait Implementations

Returns a copy of the value. Read more
Performs copy-assignment from source. Read more
Formats the value using the given formatter. Read more
The resulting type after dereferencing.
Dereferences the value.
Feeds this value into the given Hasher. Read more
Feeds a slice of this type into the given Hasher. Read more
This method returns an Ordering between self and other. Read more
Compares and returns the maximum of two values. Read more
Compares and returns the minimum of two values. Read more
Restrict a value to a certain interval. Read more
This method tests for self and other values to be equal, and is used by ==. Read more
This method tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason. Read more
This method returns an ordering between self and other values if one exists. Read more
This method tests less than (for self and other) and is used by the < operator. Read more
This method tests less than or equal to (for self and other) and is used by the <= operator. Read more
This method tests greater than (for self and other) and is used by the > operator. Read more
This method tests greater than or equal to (for self and other) and is used by the >= operator. Read more

Auto Trait Implementations

Blanket Implementations

Gets the TypeId of self. Read more
Immutably borrows from an owned value. Read more
Mutably borrows from an owned value. Read more

Returns the argument unchanged.

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

The resulting type after obtaining ownership.
Creates owned data from borrowed data, usually by cloning. Read more
Uses borrowed data to replace owned data, usually by cloning. Read more
The type returned in the event of a conversion error.
Performs the conversion.
The type returned in the event of a conversion error.
Performs the conversion.

Layout

Note: Most layout information is completely unstable and may even differ between compilations. The only exception is types with certain repr(...) attributes. Please see the Rust Reference’s “Type Layout” chapter for details on type layout guarantees.

Size: 8 bytes