Class: Fiddle::Closure

Relationships & Source Files
Namespace Children
Classes: BlockCaller
Extension / Inclusion / Inheritance Descendants
Subclasses: BlockCaller
Inherits:	Object
Defined in:	ext/fiddle/closure.c, ext/fiddle/lib/fiddle/closure.rb

Overview

Description

An FFI closure wrapper, for handling callbacks.

Example

closure = Class.new(Fiddle::Closure) {
  def call
    10
  end
}.new(Fiddle::TYPE_INT, [])
   #=> #<#<Class:0x0000000150d308>:0x0000000150d240>
func = Fiddle::Function.new(closure, [], Fiddle::TYPE_INT)
   #=> #<Fiddle::Function:0x00000001516e58>
func.call
   #=> 10

Class Method Summary

.new(ret, args, abi = Fiddle::DEFAULT) constructor

Construct a new Closure object.

Instance Attribute Summary

#args readonly

arguments of the FFI closure.
#ctype readonly

the C type of the return of the FFI closure.

Instance Method Summary

#to_i

Returns the memory address for this closure.

Constructor Details

.new(ret, args, abi = Fiddle::DEFAULT)

Construct a new Closure object.

ret is the C type to be returned
#args is an Array of arguments, passed to the callback function
abi is the abi of the closure

If there is an error in preparing the ffi_cif or ffi_prep_closure, then a RuntimeError will be raised.

Instance Attribute Details

#args (readonly)

arguments of the FFI closure

[ GitHub ]

# File 'ext/fiddle/lib/fiddle/closure.rb', line 9


attr_reader :args

#ctype (readonly)

the C type of the return of the FFI closure

[ GitHub ]

# File 'ext/fiddle/lib/fiddle/closure.rb', line 6


attr_reader :ctype

Instance Method Details

#to_i

Returns the memory address for this closure