kotlinx-serialization-core/kotlinx.serialization.encoding/Decoder/decodeNotNullMark

decodeNotNullMark

abstract fun decodeNotNullMark(): Boolean(source)

Returns true if the current value in decoder is not null, false otherwise. This method is usually used to decode potentially nullable data:

// Could be String? deserialize() method
public fun deserialize(decoder: Decoder): String? {
    if (decoder.decodeNotNullMark()) {
        return decoder.decodeString()
    } else {
        return decoder.decodeNull()
    }
}