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Compiling old OCT files

From: E. Joshua Rigler
Subject: Compiling old OCT files
Date: Thu, 09 Sep 2004 11:59:54 -0600

I recently decided to dust off some old DLD functions I developed a few
years ago using Octave 2.1.34 (or so), and Redhat linux 7.2.  Now I use
Octave 2.1.57 (self-compiled with Octave Forge) on Enterprise Redhat,
and I get two consistent errors that didn't used to occur.

1) Every time I try to return a null matrix after printing out an error
message (i.e.,

[376]  error ("Too many inputs.\n");
[377]  return retval = Matrix (0,0);

), I get this error when I use mkoctfile: no match for `octave_value_list& = Matrix' operator
/usr/local/include/octave-2.1.57/octave/oct-obj.h:78: candidates are:
   octave_value_list& octave_value_list::operator=(const octave_value_list&)

2) I am having problems with strings.  Sadly, I don't really remember
why I coded things the way I did three years ago.  I think I took some
hints from JWE.  Everything worked, but I didn't really understand what
I was doing at the time.  For instance, the following code used to work
for copying a "const char*" value to a "char*" because the C library
function I was writing a wrapper for couldn't handle the former:

[488]  char *fmt = new char [args(1).string_value ().length () +1];
[489]  args(1).string_value ().copy (fmt, string::npos);
[490]  fmt [args(1).string_value ().length ()] = '\0';

Now, I get the following error: `string' undeclared (first use this function) (Each undeclared identifier is reported only once for each
     function it appears in.) syntax error before `::' token

This is, in fact, the first time I've played with any C++ code in over
three years, so for all I know, my questions may not even be specific to
Octave.  I did browse quickly through Da Coda Al Fine, but found nothing
that promised any help.  Any hints would be most appreciated.  Thanks.


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