struct HybridHashMap(K, V = void, alias hasher = hashOf, string keyEqualPred = defaultKeyEqualPredOf!(K), Allocator = Mallocator, BorrowCheckFlag borrowCheckFlag = BorrowCheckFlag.no, uint linearSearchMaxSize = 64, PrimeCapacityFlag primeCapacityFlag = PrimeCapacityFlag.no)
enum hasValue =
!is(V == void);
In the hash map case, V is non-void, and a value is stored alongside the key of type K.