def callback(*args)
raise ArgumentError, "wrong number of arguments" if args.length < 2 || args.length > 3
name, params, ret = if args.length == 3
args
else
[ nil, args[0], args[1] ]
end
native_params = params.map { |e| find_type(e) }
raise ArgumentError, "callbacks cannot have variadic parameters" if native_params.include?(FFI::Type::VARARGS)
options = Hash.new
options[:convention] = ffi_convention
options[:enums] = @ffi_enums if defined?(@ffi_enums)
cb = FFI::CallbackInfo.new(find_type(ret), native_params, options)
unless name.nil?
typedef cb, name
end
cb
end