Re: get-live-buffer primitive

[martin rudalics <rudalics@gmx.at>]

 > Meanwhile, `get-buffer' will not find a dead buffer by name.
 > So I don't see a need to create a `get-live-buffer' function.
 > Unless the purpose were only to get an error if the argument
 > is a dead buffer.

Just a few examples that could benefit from such a function:

Fset_window_buffer has

   buffer = Fget_buffer (buffer_or_name);
   CHECK_BUFFER (buffer);
   if (NILP (BVAR (XBUFFER (buffer), name)))
     error ("Attempt to display deleted buffer");

Finsert_buffer_substring

   buf = Fget_buffer (buffer);
   if (NILP (buf))
     nsberror (buffer);
   bp = XBUFFER (buf);
   if (!BUFFER_LIVE_P (bp))
     error ("Selecting deleted buffer");

Fcompare_buffer_substrings

       buf1 = Fget_buffer (buffer1);
       if (NILP (buf1))
	nsberror (buffer1);
       bp1 = XBUFFER (buf1);
       if (!BUFFER_LIVE_P (bp1))
	error ("Selecting deleted buffer");

       ...

       buf2 = Fget_buffer (buffer2);
       if (NILP (buf2))
	nsberror (buffer2);
       bp2 = XBUFFER (buf2);
       if (!BUFFER_LIVE_P (bp2))
	error ("Selecting deleted buffer");

Fset_buffer

   buffer = Fget_buffer (buffer_or_name);
   if (NILP (buffer))
     nsberror (buffer_or_name);
   if (!BUFFER_LIVE_P (XBUFFER (buffer)))
     error ("Selecting deleted buffer");

martin