HashMap.opApply

Support for foreach(key, value; aa) { ... } syntax;

struct HashMap(K, V, Allocator = Mallocator, alias hashFunction = generateHash!K, bool supportGC = shouldAddGCRange!K || shouldAddGCRange!V)
int
opApply
(
this This
)
(
int delegate(
ref K
,
ref V
)
del
)

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