class Fiddle::Closure

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

Attributes

args[R]

arguments of the FFI closure

ctype[R]

the C type of the return of the FFI closure

Public Class Methods

new(ret, args, abi = Fiddle::DEFAULT) click to toggle source

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.

static VALUE
initialize(int argc, VALUE *argv, VALUE self)
{
    initialize_data data;
    data.self = self;
    data.argc = argc;
    data.argv = argv;
    return rb_rescue(initialize_body, (VALUE)&data,
                     initialize_rescue, (VALUE)&data);
}

Public Instance Methods

to_i() click to toggle source

Returns the memory address for this closure

static VALUE
to_i(VALUE self)
{
    fiddle_closure * cl;
    void *code;

    TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, cl);

    code = cl->code;

    return PTR2NUM(code);
}