Optional

Optional

Optional represents the type of a value that might exist.

Specifications

Type	Size	Memory Management Model	File
Optional	? bytes	Scoped	2.7/Optional.adept

Definition

struct <$T> Optional (value $T, has bool)

where

$T is any valid type

Fields

Name	Type	Description
has	bool	Whether a value exists
value	$T	Wrapped value, only exists if has is true

Value Management Definitions

• verbatim func __defer__(this *<$T> Optional)

Memory Management

optional.value is freed at the end of the scope if optional.has is true.

Functions

• func none() <$T> Optional

  Returns an empty optional. Should be used with ~> operator like none() ~> <int> Optional.

  [view src]

• func some(contained POD $T) <$T> Optional

  Returns an optional with a contained value. The contained value is copied byte for byte, so some values may need modifications before being given to this function.

  [view src]

Methods

• func set(this *<$T> Optional, value POD $T) void

  Sets an optional to a value. The value is copied byte for byte, so some values may need modifications before being given to this function.

  [view src]

• func get(this *<$T> Optional) $T

  Gets the contained value of an optional.

  [view src]

• func getPointer(this *<$T> Optional) *$T

  Gets a pointer to the contained value of an optional.

  [view src]

• func rid(this *<$T> Optional) void

  Sets an optional to not contain anything.

  [view src]

Settings

#default optional_warn_no_value true