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get_or_default #33

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84b897b
get_or_default
arcnmx Jan 11, 2016
c68d900
Expose Implements
arcnmx Jan 11, 2016
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10 changes: 8 additions & 2 deletions src/lib.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -11,8 +11,7 @@ use std::marker::PhantomData;

use Entry::{Occupied, Vacant};

pub use internals::{CloneAny, DebugAny};
use internals::Implements;
pub use internals::{CloneAny, DebugAny, Implements};

/// A map keyed by types.
///
Expand Down Expand Up @@ -139,6 +138,13 @@ impl<A: UnsafeAnyExt + ?Sized> TypeMap<A> {
})
}

/// Find a value in the map and get a reference to it if it exists, or
/// insert a default value first.
pub fn get_or_default<K: Key>(&mut self) -> &mut K::Value
where K::Value: Any + Implements<A> + Default {
self.entry::<K>().or_insert_with(Default::default)
}

/// Get the given key's corresponding entry in the map for in-place manipulation.
pub fn entry<'a, K: Key>(&'a mut self) -> Entry<'a, K, A>
where K::Value: Any + Implements<A> {
Expand Down