Enum GenericsHeadFilter 

pub enum GenericsHeadFilter<'db> {
    NoFilter,
    FirstGenericFilter(GenericArgumentHead<'db>),
    NoGenerics,
}

A lookup filter on generic arguments that is not based on current inference state. This is used for caching queries.

Variants

NoFilter

No filter is applied. When nothing is known about the generics, this will lead to a wider search.

FirstGenericFilter(GenericArgumentHead<'db>)

Generics exists and the first generic parameter has a filter. This is usually enough to considerably reduce the number of searched items.

NoGenerics

Generics must not exist.

Trait Implementations

impl<'db> Clone for GenericsHeadFilter<'db>

fn clone(&self) -> GenericsHeadFilter<'db>

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl<'db> Debug for GenericsHeadFilter<'db>

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

Formats the value using the given formatter.

impl<'db> Hash for GenericsHeadFilter<'db>

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<'db> PartialEq for GenericsHeadFilter<'db>

fn eq(&self, other: &GenericsHeadFilter<'db>) -> bool

Tests for self and other values to be equal, and is used by ==.

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

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<'db> Update for GenericsHeadFilter<'db>

unsafe fn maybe_update(old_pointer_: *mut Self, new_value_: Self) -> bool

Returns

impl<'db> Eq for GenericsHeadFilter<'db>

impl<'db> StructuralPartialEq for GenericsHeadFilter<'db>