TreeMap.opApply

Supports foreach(k, v; treeMap) syntax.

struct TreeMap(K, V, Allocator = Mallocator, alias less = "a < b", bool supportGC = shouldAddGCRange!K || shouldAddGCRange!V, size_t cacheLineSize = 64)
int
opApply
(
this This
)
(
int delegate(
ref K
,
ref V
)
loopBody
)

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