From: An Onymous <lbertacco@...>
Date: 2007-10-20T12:40:19+09:00
Subject: Re: extendig ruby: defining classes and creating objects fro

Thank you. Now it works.
I ended up writing an updated version of rb_raise which behaves more 
like the ruby "raise" global function. That is:
myrb_raise(Qnil,NULL) behaves like "raise"
myrb_raise(Qnil,fmt,...) behaves like "raise <string>" raising a 
RuntimeError with the given message
myrb_raise(exc,NULL) behaves like "raise <exc>" where exc can be either 
a class OR AN EXCEPTION OBJECT (if exc is an exception object, its 
message is preserved)
and
myrb_raise(exc,fmt,...) behaves like "raise <exc>,<string>" that is like 
the previous one but also setting the exception message.

Here it is:
VALUE myrb_raise(VALUE exc, const char *fmt, ...)
{
  if(!NIL_P(exc)) {
    ID exception = rb_intern("exception");
    if(!rb_respond_to(exc, exception)) rb_raise(rb_eTypeError, 
"exception class/object expected");
  }
  if(fmt) {
    va_list args;
    char buf[BUFSIZ];
    VALUE msg;
    va_init_list(args,fmt);
    vsnprintf(buf, BUFSIZ, fmt, args);
    va_end(args);
    msg=rb_str_new2(buf);
    if(NIL_P(exc)) exc = rb_class_new_instance(1, &msg, 
rb_eRuntimeError);
    else exc = rb_funcall(exc, exception, 1, msg);
  }
  rb_exc_raise(exc);
}



-- 
Posted via http://www.ruby-forum.com/.