Derive Macro Optionable 

#[derive(Optionable)]
{
    // Attributes available to this derive:
    #[optionable]
    #[optionable_attr]
}

Available on crate feature derive only.

Derive macro to derive the Optionable trait for structs/enums recursively by generating a type with all fields recursively replaced with Option versions. All non-required fields have to implement the Optionable trait. This trait is already implemented by this library for many primitive types, wrapper and container types.

Type-level attributes (on the struct/enum level)

• optionable_attr: Helper for the derive type-level attribute, for details see the derive attribute.
• derive: Allows to specify derive attributes that should be attached to the generate optioned struct/enum. If you need to forward additional helper attributes to the generated type use optionable_attr with the attribute to forward as content (works for type and field attributes).

  #[derive(optionable)]
  #[optionable(derive(Deserialize, Serialize))]
  #[optionable_attr(serde(rename_all = "camelCase"))]
  struct MyStruct{
    #[optionable_attr(serde(rename = "firstName"))]
    name: String,
    surname: String,
  }

• no_convert: Does not derive the OptionableConvert implementation. Might be required if the target type involves smart pointers or unsized fields.

  #[derive(optionable)]
  #[optionable(no_convert)]
  struct MyStruct{}

• suffix: The name of the generated optioned struct/enum will be <original><suffix> with suffix defaulting to "Opt". The suffix value can be adjusted via e.g. #[optionable(suffix="Ac")].

  #[derive(optionable)]
  #[optionable(suffix="Ac")]
  struct MyStruct{}

Field-level attributes (for structs and struct-typed enum variants)

• optionable_attr: Helper for the derive type-level attribute, for details see the derive attribute.
• required: The annotated field will be kept as is and won’t be transformed into some optional variant for the derived optioned Struct.

  #[derive(optionable)]
  struct MyStruct{
    street: String; // will be an `Option<String>` in the derived `MyStructOpt`.
    #[optionable(required)]
    number: u32; // will also be a u32 in the derived `MyStructOpt`.
  }