HybridHashMap.hasValue

In the hash map case, V is non-void, and a value is stored alongside the key of type K.

struct HybridHashMap(K, V = void, alias hasher = hashOf, string keyEqualPred = defaultKeyEqualPredOf!(K), Allocator = Mallocator, Options options = Options.init)
enum hasValue = !is(V == void);

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