protected AbstractMap()
Provides a skeletal implementation of the read-only Map interface.
The implementor is required to implement entries property, which should return read-only set of map entries.
K
- the type of map keys. The map is invariant on its key type.
V
- the type of map values. The map is covariant on its value type.
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Licensed under the Apache License, Version 2.0.
https://kotlinlang.org/api/latest/jvm/stdlib/kotlin.collections/-abstract-map/-init-.html