Mercurial > octave-nkf
view examples/code/structdemo.cc @ 20616:fd0efcdb3718
use new string_value method to handle value extraction errors
* dirfns.cc, file-io.cc, gammainc.cc, help.cc, load-path.cc,
octave-link.cc, qz.cc, regexp.cc, strfns.cc, syscalls.cc, time.cc,
variables.cc: Use new string_value method.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Thu, 08 Oct 2015 19:00:51 -0400 |
parents | 2f8500ca91d3 |
children |
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line source
#include <octave/oct.h> #include <octave/ov-struct.h> DEFUN_DLD (structdemo, args, , "Struct Demo") { if (args.length () != 2) print_usage (); if (! args(0).is_map ()) error ("structdemo: ARG1 must be a struct"); octave_scalar_map arg0 = args(0).scalar_map_value (); //octave_map arg0 = args(0).map_value (); if (! args(1).is_string ()) error ("structdemo: ARG2 must be a character string"); std::string arg1 = args(1).string_value (); octave_value tmp = arg0.contents (arg1); //octave_value tmp = arg0.contents (arg1)(0); if (! tmp.is_defined ()) error ("structdemo: struct does not have a field named '%s'\n", arg1.c_str ()); octave_scalar_map st; st.assign ("selected", tmp); return octave_value (st); }