Struct static_type_map::TypeMap
source · [−]pub struct TypeMap(_);
Expand description
A map where the key is the type of the value.
Implementations
sourceimpl TypeMap
impl TypeMap
sourcepub fn with_capacity(capacity: usize) -> Self
pub fn with_capacity(capacity: usize) -> Self
sourcepub fn capacity(&self) -> usize
pub fn capacity(&self) -> usize
Returns the number of types the map can hold without reallocating.
This number is a lower bound; the map might be able to hold more, but it is guaranteed to be able to hold at least so many.
Examples
use static_type_map::TypeMap;
let type_map = TypeMap::with_capacity(100);
assert!(type_map.capacity() >= 100);
sourcepub fn is_empty(&self) -> bool
pub fn is_empty(&self) -> bool
Returns true
if the map contains no instances of any type.
Examples
use static_type_map::TypeMap;
let type_map = TypeMap::new();
assert!(type_map.is_empty());
sourcepub fn len(&self) -> usize
pub fn len(&self) -> usize
Returns the number of types in the map.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::new();
assert_eq!(type_map.len(), 0);
type_map.insert("a");
assert_eq!(type_map.len(), 1);
sourcepub fn clear(&mut self)
pub fn clear(&mut self)
Clears the map. Keep allocated memory for reuse.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::new();
type_map.insert("a");
type_map.clear();
assert!(type_map.is_empty());
sourcepub fn reserve(&mut self, additional: usize)
pub fn reserve(&mut self, additional: usize)
Reserves capacity for at least additional
more types to be inserted in the map. The
collection may reserve more space to avoid frequent reallocations.
Panics
Panics if the new allocation size overflows usize
.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::new();
assert_eq!(type_map.capacity(), 0);
type_map.reserve(10);
assert!(type_map.capacity() >= 10);
sourcepub fn shrink_to_fit(&mut self)
pub fn shrink_to_fit(&mut self)
Shrinks the capacity of the map as much as possible. It will drop down as much as possible while mainting the internal rules and possibly leaving some space in accordance with the resize policy.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::with_capacity(100);
assert!(type_map.capacity() >= 0);
type_map.insert("a");
type_map.insert(true);
assert!(type_map.capacity() >= 2);
sourcepub fn contains<T>(&self) -> bool where
T: Any,
pub fn contains<T>(&self) -> bool where
T: Any,
Returns true
if the map contains an instance of T
.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::new();
type_map.insert("a");
assert!(type_map.contains::<&str>());
sourcepub fn get_mut<T>(&mut self) -> Option<&mut T> where
T: Any,
pub fn get_mut<T>(&mut self) -> Option<&mut T> where
T: Any,
Returns a mutable reference to an instance of T
.
If the map does not have an instance of T
, None
is returned.
Examples
use static_type_map::TypeMap;
let mut type_map = TypeMap::new();
type_map.insert("a");
if let Some(x) = type_map.get_mut::<&str>() {
*x = "b";
}
assert_eq!(type_map.get::<&str>(), Some(&"b"));
Trait Implementations
Auto Trait Implementations
impl !RefUnwindSafe for TypeMap
impl !Send for TypeMap
impl !Sync for TypeMap
impl Unpin for TypeMap
impl !UnwindSafe for TypeMap
Blanket Implementations
sourceimpl<T> BorrowMut<T> for T where
T: ?Sized,
impl<T> BorrowMut<T> for T where
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