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ext/fiddle/lib/fiddle/closure.rb

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module Fiddle

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  class Closure

 

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    # the C type of the return of the FFI closure

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    attr_reader :ctype

 

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    # arguments of the FFI closure

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    attr_reader :args

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    # Extends Fiddle::Closure to allow for building the closure in a block

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    class BlockCaller < Fiddle::Closure

 

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      # == Description

 

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      #

 

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      # Construct a new BlockCaller object.

 

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      #

 

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      # * +ctype+ is the C type to be returned

 

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      # * +args+ are passed the callback

 

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      # * +abi+ is the abi of the closure

 

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      #

 

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      # If there is an error in preparing the +ffi_cif+ or +ffi_prep_closure+,

 

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      # then a RuntimeError will be raised.

 

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      #

 

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      # == Example

 

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      #

 

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      #   include Fiddle

 

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      #

 

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      #   cb = Closure::BlockCaller.new(TYPE_INT, [TYPE_INT]) do |one|

 

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      #     one

 

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      #   end

 

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      #

 

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      #   func = Function.new(cb, [TYPE_INT], TYPE_INT)

 

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      #

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      def initialize ctype, args, abi = Fiddle::Function::DEFAULT, &block

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        super(ctype, args, abi)

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        @block = block

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      end

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      # Calls the constructed BlockCaller, with +args+

 

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      #

 

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      # For an example see Fiddle::Closure::BlockCaller.new

 

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      #

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      def call *args

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        @block.call(*args)

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      end

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