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Steve Jenson 5b93613322 Adds a OrderMap::drain() method

Problem:
Porting some code that used HashMap's drain to OrderMap revealed a small
API gap.

Solution:
Added a drain method, mirroring std::collection::HashMap's drain method.

drain() provides an efficient way to remove all values without shrinking
the capacity of the original OrderMap.

Validation:
Added unit tests and ported an existing HashMap::drain() user to
OrderMap::drain

2017-04-20 13:21:57 -07:00

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	`target`
	`Cargo.lock`