class Box(T)


A Box allows turning any object to a Void* and back.

A Box's purpose is passing data to C as a Void* and then converting that back to the original data type.

For an example usage, see Proc's explanation about sending Procs to C.

Defined in:


Class Method Summary

Instance Method Summary

Instance methods inherited from class Reference

==(other : self)
, dup dup, hash hash, inspect(io : IO) : Nil inspect, object_id : UInt64 object_id, pretty_print(pp) : Nil pretty_print, same?(other : Reference)
same?(other : Nil)
, to_s(io : IO) : Nil to_s

Constructor methods inherited from class Reference

new new

Instance methods inherited from class Object

!=(other) !=, !~(other) !~, ==(other) ==, ===(other : JSON::Any)
===(other : YAML::Any)
, =~(other) =~, class class, dup dup, hash hash, inspect(io : IO)
, itself itself, not_nil! not_nil!, pretty_inspect(width = 79, newline = "\n", indent = 0) : String pretty_inspect, pretty_print(pp : PrettyPrint) : Nil pretty_print, tap(&block) tap, to_json(io : IO)
, to_pretty_json(indent : String = " ")
to_pretty_json(io : IO, indent : String = " ")
, to_s
to_s(io : IO)
, to_yaml(io : IO)
, try(&block) try, unsafe_as(type : T.class) forall T unsafe_as

Constructor methods inherited from class Object

from_json(string_or_io, root : String) : self
from_json(string_or_io) : self
, from_yaml(string_or_io) : self from_yaml

Constructor Detail

def : T) #

Creates a Box with the given object.

This method isn't usually used directly. Instead, is used.

[View source]

Class Method Detail

def : Pointer(Void) #

Creates a Box for an object and returns it as a Void*.

[View source]
def self.unbox(pointer : Pointer(Void)) : T #

Unboxes a Void* into an object of type T. Note that for this you must specify T: Box(T).unbox(data).

[View source]

Instance Method Detail

def object : T #

Returns the original object

[View source]