bors a8feaee5b6 Auto merge of #44734 - mchlrhw:wip/hashmap-entry-and-then, r=BurntSushi ...

Implement `and_modify` on `Entry`

## Motivation

`Entry`s are useful for allowing access to existing values in a map while also allowing default values to be inserted for absent keys. The existing API is similar to that of `Option`, where `or` and `or_with` can be used if the option variant is `None`.

The `Entry` API is, however, missing an equivalent of `Option`'s `and_then` method. If it were present it would be possible to modify an existing entry before calling `or_insert` without resorting to matching on the entry variant.

Tracking issue: https://github.com/rust-lang/rust/issues/44733.

2017-10-06 12:51:11 +00:00

..

benches

…

btree

Implement entry_and_modify

2017-10-06 09:10:31 +01:00

tests

…

allocator.rs

…

arc.rs

…

binary_heap.rs

…

borrow.rs

…

boxed_test.rs

…

boxed.rs

…

Cargo.toml

…

fmt.rs

…

heap.rs

…

lib.rs

…

linked_list.rs

…

macros.rs

…

range.rs

…

raw_vec.rs

…

rc.rs

…

slice.rs

…

str.rs

…

string.rs

…

vec_deque.rs

…

vec.rs

…