Function: boundp

boundp is a function defined in data.c.

Signature

(boundp SYMBOL)

Documentation

Return t if SYMBOL's value is not void.

Note that if lexical-binding is in effect, this refers to the global value outside of any lexical scope.

View in manual

Probably introduced at or before Emacs version 16.

Source Code

// Defined in /usr/src/emacs/src/data.c
{
  Lisp_Object valcontents;
  struct Lisp_Symbol *sym;
  CHECK_SYMBOL (symbol);
  sym = XSYMBOL (symbol);

 start:
  switch (sym->u.s.redirect)
    {
    case SYMBOL_PLAINVAL: valcontents = SYMBOL_VAL (sym); break;
    case SYMBOL_VARALIAS: sym = indirect_variable (sym); goto start;
    case SYMBOL_LOCALIZED:
      {
	struct Lisp_Buffer_Local_Value *blv = SYMBOL_BLV (sym);
	if (blv->fwd.fwdptr)
	  /* In set_internal, we un-forward vars when their value is
	     set to Qunbound.  */
          return Qt;
	else
	  {
	    swap_in_symval_forwarding (sym, blv);
	    valcontents = blv_value (blv);
	  }
	break;
      }
    case SYMBOL_FORWARDED:
      /* In set_internal, we un-forward vars when their value is
	 set to Qunbound.  */
      return Qt;
    default: emacs_abort ();
    }

  return (BASE_EQ (valcontents, Qunbound) ? Qnil : Qt);
}