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module Fiddle
class Closure
# the C type of the return of the FFI closure
attr_reader :ctype
# arguments of the FFI closure
attr_reader :args
# Extends Fiddle::Closure to allow for building the closure in a block
class BlockCaller < Fiddle::Closure
# == Description
#
# Construct a new BlockCaller object.
#
# * +ctype+ is the C type to be returned
# * +args+ are passed the callback
# * +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.
#
# == Example
#
# include Fiddle
#
# cb = Closure::BlockCaller.new(TYPE_INT, [TYPE_INT]) do |one|
# one
# end
#
# func = Function.new(cb, [TYPE_INT], TYPE_INT)
#
def initialize ctype, args, abi = Fiddle::Function::DEFAULT, &block
super(ctype, args, abi)
@block = block
end
# Calls the constructed BlockCaller, with +args+
#
# For an example see Fiddle::Closure::BlockCaller.new
#
def call *args
@block.call(*args)
end
end
end
end