CompactMapBasedCodecs

Macro that creates an Encoder and Decoder pair for T and all direct and indirect sub-types of T. Convenience shortcut for Codec(deriveAllEncoders[T], deriveAllDecoders[T]).

Macro that creates a Decoder for T and all direct and indirect sub-types of T, which are concrete, i.e. not abstract. T must be an enum, sealed abstract class or sealed trait.

It works by generating a code block such as this one:

 implicit val a = deriveDecoder[A]     // one such line is generated for each concrete
 implicit val b = deriveDecoder[B]     // direct or indirect sub-type of T which doesn't
 implicit val c = deriveDecoder[C]     // already have an implicit Decoder available
 ...
 deriveDecoder[T]

If a Decoder for a certain concrete sub-type S <: T is already implicitly available at the macro call-site the respective line for the sub-type is not generated.

If a Decoder for a certain abstract sub-type S <: T is already implicitly available at the macro call-site the respective lines for all sub-types of S are not generated.

This means that you can specify your own custom Decoders for concrete sub-types or whole branches of the sub-type hierarchy and they will be properly picked up rather than create conflicts.

Macro that creates an Encoder for T and all direct and indirect sub-types of T, which are concrete, i.e. not abstract. T must be an enum, sealed abstract class or sealed trait.

It works by generating a code block such as this one:

 implicit val a = deriveEncoder[A]     // one such line is generated for each concrete
 implicit val b = deriveEncoder[B]     // direct or indirect sub-type of T which doesn't
 implicit val c = deriveEncoder[C]     // already have an implicit Encoder available
 ...
 deriveEncoder[T]

If an Encoder for a certain concrete sub-type S <: T is already implicitly available at the macro call-site the respective line for the sub-type is not generated.

If an Encoder for a certain abstract sub-type S <: T is already implicitly available at the macro call-site the respective lines for all sub-types of S are not generated.

This means that you can specify your own custom Encoders for concrete sub-types or whole branches of the sub-type hierarchy and they will be properly picked up rather than create conflicts.

Macro that creates an Encoder and Decoder pair for T. Convenience shortcut for Codec(deriveEncoder[T], deriveDecoder[T]).

Macro that creates a Decoder for T provided that

• T is a case class, enum, sealed abstract class or sealed trait
• Decoder instances for all members of T (if T is a case class) or all sub-types of T (if T is an ADT) are implicitly available

Case classes are created from a map of values, one key-value pair for each member. The key for each member is a String holding the member's name. This can be customized with the key annotation.

NOTE: If T is unary (i.e. only has a single member) then the member value is written in an unwrapped form, i.e. without the map container.

Macro that creates an Encoder for T provided that

• T is a case class, enum, sealed abstract class or sealed trait
• Encoder instances for all members of T (if T is a case class) or all sub-types of T (if T is an ADT) are implicitly available

Case classes are converted into a map of values, one key-value pair for each member. The key for each member is a String holding the member's name. This can be customized with the key annotation.

NOTE: If T is unary (i.e. only has a single member) then the member value is written in an unwrapped form, i.e. without the map container.