From: Charles Mills <cmills@...>
Date: 2004-06-23T04:27:08+09:00
Subject: Re: passing a block in an extension


On Jun 22, 2004, at 11:54 AM, Jeff Mitchell wrote:

> --- Charles Mills <cmills@freeshell.org> wrote:
>> I am trying to write a function in C which calls a Ruby function using
>> the block it was passed when called from Ruby.  Below is broken way to
>> do it, but it explains the idea better.
>>
>> $ irb
>> irb(main):001:0> require 'test'
>> => true
>> irb> my_method do |r|
>> irb* 	puts r
>> irb> end
>> LocalJumpError: no block given
>>          from (irb):4:in `each'
>>          from (irb):4:in `my_method'
>>          from (irb):4
>> irb> exit
>> $ more test.c
>> #include <ruby.h>
>> #include <intern.h>
>>
>> VALUE
>> my_method(VALUE kernel)
>> {
>>          VALUE ary = rb_ary_new();
>>          VALUE str1 = rb_str_new2("hey");
>>          VALUE str2 = rb_str_new2("hey you");
>>          rb_ary_push(ary, str1);
>>          rb_ary_push(ary, str2);
>>
>>          //return rb_funcall(ary, rb_intern("each"), 0, 0);
>
>            return rb_yield(ary);
>
Not exactly what I am after.  I was hoping to be able to use the block 
passed to "my_method" as a parameter to a call when calling a method 
(in this case "each") on a Ruby object (in this case ary) created in 
"my_method".

>> }
>>
>> void Init_test()
>> {
>>          rb_define_module_function(rb_mKernel, "my_method", my_method,
>> 0);
>> }
>
>
>
> 	
> 		
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