module Change::TypeCast

Defined in:

change/typecast.cr
change/typecast/json.cr

Class Method Summary

• .cast(value : Nil, target : Nil.class) : Tuple(Bool, Nil | Nil)

  Nil

• .cast(value : JSON::Any, target : Nil.class) : Tuple(Bool, Nil | Nil)
• .cast(value, target : Nil.class) : Tuple(Bool, Nil)

  Some other types have their own representations of nil (such as JSON::Any), so value is left untyped here.

• .cast(value : Nil, target : T.class) : Tuple(Bool, T | Nil) forall T

  Casting from nil is always considered valid to deal with field nilability.

• .cast(value : JSON::Any, target : Bool.class) : Tuple(Bool, Bool | Nil)
• .cast(value, target : Bool.class)

  Booleans Boolean casts allow the strings "false" and "true" as their respective boolean values, but nothing else.

• .cast(value : JSON::Any, target : String.class) : Tuple(Bool, String | Nil)
• .cast(value, target : String.class) : Tuple(Bool, String | Nil)

  Strings

• .cast(value : JSON::Any, target : Int32.class) : Tuple(Bool, Int32 | Nil)
• .cast(value, target : Int32.class) : Tuple(Bool, Int32 | Nil)

  Integers

• .cast(value : JSON::Any, target : Int64.class) : Tuple(Bool, Int64 | Nil)
• .cast(value, target : Int64.class) : Tuple(Bool, Int64 | Nil)
• .cast(value : JSON::Any, target : Float32.class) : Tuple(Bool, Float32 | Nil)
• .cast(value, target : Float32.class) : Tuple(Bool, Float32 | Nil)

  Floats

• .cast(value : JSON::Any, target : Float64.class) : Tuple(Bool, Float64 | Nil)
• .cast(value, target : Float64.class) : Tuple(Bool, Float64 | Nil)
• .cast(value : JSON::Any, target : Int.class) : Tuple(Bool, Int | Nil)
• .cast(value : JSON::Any, target : Float.class) : Tuple(Bool, Float | Nil)

Macro Summary

• def_cast(given, target)
• method_cast(kind, method)

  Define a fallback cast method for all casts to a given type.

Class Method Detail

Macro Detail