From: Simon Strandgaard <0bz63fz3m1qt3001@...>
Date: 2003-06-06T08:22:02+09:00
Subject: Re: Ruby-SWIG question: wrapping function objects with blocks

>> On Thu, 05 Jun 2003 17:07:03 +0200, Christian Szegedy wrote:
>> 
>>> In out project, there are a lot of functions which
>>> take a function object parameter (Apply<T>)
>>> and call then may call the call method of this
>>> object. I would like to wrap it with a Ruby code
>>> which takes a block and the creates a new apply
>>> object whose call function calls the block.

OK.. I did it without SWIG..  tell me if you can use it ?

> ls
CVS/            example.c       extconf.rb      test.rb
> ruby extconf.rb && gmake
creating Makefile
gcc -fPIC -g -O2 -I. -I/home/neoneye/stow/ruby18_r2/lib/ruby/1.8/i386-freebsd5.0 -I/home/neoneye/stow/ruby18_r2/lib/ruby/1.8/i386-freebsd5.0 -I.   -c example.c
gcc -shared -rdynamic -Wl,-soname,  -L"/home/neoneye/stow/ruby18_r2/lib" -o Example.so example.o  -lcrypt -lm  -lc
> ruby test.rb
before
proc
after
before
yield
after
> cat test.rb
require 'Example'

test_hook = Proc.new do
        puts "proc"
end

test(test_hook)

def xtest
        p = Proc.new do
                yield
        end
        test(p)
end

xtest do
        puts "yield"
end
> cat example.c
#include <stdio.h>
#include <ruby.h>

/*
def test(hook); hook.call; end
*/
VALUE wrap_test(VALUE self, VALUE hook) {
        printf("before\n");
        rb_funcall(hook, rb_intern("call"), 0);
        printf("after\n");
        return Qnil;
}

int Init_Example() {
        rb_define_global_function("test", wrap_test, 1);
        return 0;
}
> cat extconf.rb
require 'mkmf'
create_makefile("Example")
>


 
--
Simon Strandgaard