Passing block in C

Ruby
1

Hi.

How can I call Ruby function from C with block?
E. g.

VALUE block = rb_proc_new(…);
rb_funcall_with_block(cMyClass, rb_intern(“initialize”), 0, block);

WBR, Peter Z.

2

Peter Z. wrote:

How can I call Ruby function from C with block?
E. g.

VALUE block = rb_proc_new(…);
rb_funcall_with_block(cMyClass, rb_intern(“initialize”), 0, block);

Let me Google that for you!

http://www.google.com/codesearch?q=rb_proc_new

3

Quoting P. [email protected]:

http://www.google.com/codesearch?q=rb_proc_new
Ehm. I meant ‘what function must be in place of
rb_funcall_with_block’. I know how do rb_proc_new work.

WBR, Peter Z.

4

Quoting “Robert K.” [email protected]:

Let me Google that for you!

Which proves that his suggested search was indeed helpful. :slight_smile:

It isn’t. See RubyDoc:

ObjectSpace.define_finalizer(obj, aProc=proc())
Adds aProc as a finalizer, to be called after obj was destroyed.

Notice the aProc is an argument, not block.
So that code is analogue for Ruby
method(object, proc { some_code })
and I need
method(object) { some_code}

WBR, Peter Z.

5

Hi Peter,

On Sun, 2009-03-29 at 23:30 +0900, Peter Z. wrote:

Hi.

How can I call Ruby function from C with block?

You can use rb_iterate():

static VALUE
foo_i(VALUE x, VALUE dummy)
{
rb_p(x);
return Qnil;
}

static VALUE
rb_foo(VALUE self)
{
rb_yield(INT2FIX(42));
return Qnil;
}

static VALUE
call_foo(VALUE klass)
{
return rb_funcall(klass, rb_intern(“foo”), 0);
}

void
Init_myclass(void)
{
VALUE klass = rb_define_class(“MyClass”, rb_cObject);
rb_define_singleton_method(klass, “foo”, rb_foo, 0);
rb_iterate(call_foo, klass, foo_i, (VALUE)NULL);
}

Best,
Andre

6

On 29.03.2009 17:58, Peter Z. wrote:

http://www.google.com/codesearch?q=rb_proc_new

Ehm. I meant ‘what function must be in place of
rb_funcall_with_block’. I know how do rb_proc_new work.

I think that Phlip understood this. If you look at the results you’ll
find this

http://www.google.com/codesearch/p?hl=de#X2brleciKjw/trunk/devel/RubyClass.cpp&q=rb_proc_new

Which proves that his suggested search was indeed helpful. :slight_smile:

Cheers

robert

7

I think that Phlip understood this.

Actually I didn’t. I was just having a “let me Google CodeSearch that
for you”
moment… (-:

8

On 29.03.2009 18:23, Peter Z. wrote:

VALUE block = rb_proc_new(…);

and I need
method(object) { some_code}

Right, stupid me. Should have looked more closely. My apologies for
the unnecessary noise.

rb_iterate seems indeed the proper method:

http://www.ruby-doc.org/docs/ProgrammingRuby/html/ext_ruby.html#S8

Kind regards

robert

9

Quoting “Robert K.” [email protected]:

http://www.google.com/codesearch/p?hl=de#X2brleciKjw/trunk/devel/RubyClass.cpp&q=rb_proc_new
method(object, proc { some_code })
and I need
method(object) { some_code}

Right, stupid me. Should have looked more closely. My apologies
for the unnecessary noise.

rb_iterate seems indeed the proper method:

Programming Ruby: The Pragmatic Programmer's Guide

Yes, rb_iterate is exactly what I need.
Thanks for this ruby-doc link anyway… before I analyzed sources of
every un-obvious function :slight_smile:

WBR, Peter Z.