HashMap.opApply

Undocumented in source. Be warned that the author may not have intended to support it.
struct HashMap(TKey, TValue, Traits = DefaultHashMapTraits!TKey, Allocator = IAllocator)
int
opApply
(
DG
)
(
scope DG del
)
if (
isOpApplyDg!(DG, Key, Value)
)
if (
is(typeof(Traits.clearValue) : TKey)
)

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