This guarantees that API users are aware of the types of API members they use.ĭepending on your configuration, these explicit APIs can produce errors ( strict mode) or warnings ( warning mode). This helps ensure that no declarations are exposed to the public API unintentionally.Įxplicit type specifications are required for properties and functions that are exposed to the public API. Visibility modifiers are required for declarations if the default visibility exposes them to the public API. It adds the following requirements for declarations exposed to the library's public API: In this mode, the compiler performs additional checks that help make the library's API clearer and more consistent. Kotlin compiler offers explicit API mode for library authors. Learn more about Kotlin functional interfaces and SAM conversions. In this case, the compiler automatically converts the lambda to an instance of the class that implements the abstract member function. SAM conversion applies if you pass a lambda as an argument when an interface with only one single abstract method is expected as a parameter. To do so, mark a Kotlin interface explicitly as functional with the fun modifier. From now on, you can use SAM conversions for Kotlin interfaces as well. They include:īreak and continue inside when included in loopsīefore Kotlin 1.4.0, you could apply SAM (Single Abstract Method) conversions only when working with Java methods and Java interfaces from Kotlin. Kotlin 1.4.0 comes with a variety of different language features and improvements. Below you will find the list of the most important changes in Kotlin 1.4.0. In Kotlin 1.4.0, we ship a number of improvements in all of its components, with the focus on quality and performance.
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