pub enum Type<'a> {
Named(Cow<'a, str>),
List(Box<Type<'a>>),
NonNullNamed(Cow<'a, str>),
NonNullList(Box<Type<'a>>),
}
Expand description
A type literal in the syntax tree
This enum carries no semantic information and might refer to types that do not exist.
Variants
Named(Cow<'a, str>)
A nullable named type, e.g. String
List(Box<Type<'a>>)
A nullable list type, e.g. [String]
The list itself is what’s nullable, the containing type might be non-null.
NonNullNamed(Cow<'a, str>)
A non-null named type, e.g. String!
NonNullList(Box<Type<'a>>)
A non-null list type, e.g. [String]!
.
The list itself is what’s non-null, the containing type might be null.
Implementations
sourceimpl<'a> Type<'a>
impl<'a> Type<'a>
sourcepub fn name(&self) -> Option<&str>
pub fn name(&self) -> Option<&str>
Get the name of a named type.
Only applies to named types; lists will return None
.
sourcepub fn innermost_name(&self) -> &str
pub fn innermost_name(&self) -> &str
Get the innermost name by unpacking lists
All type literals contain exactly one named type.
sourcepub fn is_non_null(&self) -> bool
pub fn is_non_null(&self) -> bool
Determines if a type only can represent non-null values.
Trait Implementations
impl<'a> Eq for Type<'a>
impl<'a> StructuralEq for Type<'a>
impl<'a> StructuralPartialEq for Type<'a>
Auto Trait Implementations
impl<'a> RefUnwindSafe for Type<'a>
impl<'a> Send for Type<'a>
impl<'a> Sync for Type<'a>
impl<'a> Unpin for Type<'a>
impl<'a> UnwindSafe for Type<'a>
Blanket Implementations
sourceimpl<T> BorrowMut<T> for Twhere
T: ?Sized,
impl<T> BorrowMut<T> for Twhere
T: ?Sized,
const: unstable · sourcefn borrow_mut(&mut self) -> &mut T
fn borrow_mut(&mut self) -> &mut T
Mutably borrows from an owned value. Read more
sourceimpl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
impl<Q, K> Equivalent<K> for Qwhere
Q: Eq + ?Sized,
K: Borrow<Q> + ?Sized,
sourcefn equivalent(&self, key: &K) -> bool
fn equivalent(&self, key: &K) -> bool
Compare self to
key
and return true
if they are equal.