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
the C type of the return of the FFI closure
arguments of the FFI closure
# File tmp/rubies/ruby-master/ext/fiddle/lib/fiddle/closure.rb, line 16
def create(*args)
if block_given?
closure = new(*args)
begin
yield(closure)
ensure
closure.free
end
else
new(*args)
end
end
Create a new closure. If a block is given, the created closure is automatically freed after the given block is executed.
The all given arguments are passed to Fiddle::Closure.new. So using this method without block equals to Fiddle::Closure.new.
Example
Fiddle::Closure.create(TYPE_INT, [TYPE_INT]) do |closure| # closure is freed automatically when this block is finished. end
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);
}
Construct a new Closure object.
-
retis the C type to be returned -
argsis anArrayof arguments, passed to the callback function -
abiis 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
closure_free(VALUE self)
{
fiddle_closure *closure;
TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, closure);
if (closure) {
dealloc(closure);
RTYPEDDATA_DATA(self) = NULL;
}
return RUBY_Qnil;
}
Free this closure explicitly. You can’t use this closure anymore.
If this closure is already freed, this does nothing.
static VALUE
closure_freed_p(VALUE self)
{
fiddle_closure *closure;
TypedData_Get_Struct(self, fiddle_closure, &closure_data_type, closure);
return closure ? RUBY_Qfalse : RUBY_Qtrue;
}
Whether this closure was freed explicitly.
static VALUE
to_i(VALUE self)
{
fiddle_closure *closure = get_raw(self);
return PTR2NUM(closure->code);
}
Returns the memory address for this closure.