From: Barry <evansbj@...>
Date: 2005-08-22T02:26:23+09:00
Subject: A question about name reflection

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Hello All

Sorry if the answer to this question is obvious, I'm new to the  
language.

I'm considering ruby for a project and I was wondering if it provided  
some particular functionality.

Say you are writing some extensions to Ruby and you have something like:

     rb_define_method(rb_cMethod, "call", method_call, -1);
     rb_define_method(rb_cMethod, "[]", method_call, -1);

At least 2 different method names in ruby that call the same piece of  
C code..

static VALUE
method_call(argc, argv, method)
     int argc;
     VALUE *argv;
     VALUE method;
{
     VALUE result = Qnil;    /* OK */
     struct METHOD *data;
     int state;
     volatile int safe = -1;

     Data_Get_Struct(method, struct METHOD, data);
     if (data->recv == Qundef) {
     rb_raise(rb_eTypeError, "you cannot call unbound method; bind  
first");
     }
     PUSH_ITER(rb_block_given_p()?ITER_PRE:ITER_NOT);
     PUSH_TAG(PROT_NONE);
     if (OBJ_TAINTED(method)) {
     safe = ruby_safe_level;
     if (ruby_safe_level < 4) ruby_safe_level = 4;
     }
     if ((state = EXEC_TAG()) == 0) {
     result = rb_call0(data->klass,data->recv,data->id,data- 
 >oid,argc,argv,data->body,0);
     }
     POP_TAG();
     POP_ITER();
     if (safe >= 0) ruby_safe_level = safe;
     if (state) JUMP_TAG(state);
     return result;
}

Now can the C function method_call determine what "name" the ruby  
caller used when method_call was invoked?  "call" or "[]"?

Thanks in advance for any help...


Barry


I believe that a scientist looking at nonscientific problems is just  
as dumb as the next guy.
--Richard Feynman


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