Helper module to define map-based types. The following members are generated by use Croma.SubtypeOfMap:

• @type t
• @spec valid?(term) :: boolean

• If key_module and/or value_module exports new/1,

  • @spec new(term) :: Croma.Result.t(t)
  • @spec new!(term) :: t

Options:

• :key_module - A type module for keys.
• :value_module - A type module for values.
• :min_size - Minimum size of valid values of this type (inclusive).
• :max_size - Maximum size of valid values of this type (inclusive).
• :default - Default value for this type. Passing this option generates default/0.

Examples

defmodule MyMap do
  use Croma.SubtypeOfMap, key_module: MyString, value_module: MyInt, default: %{}
end