Mercurial > hg > octave-nkf
view libinterp/octave-value/ov-null-mat.h @ 19589:b39cbe9f3bb0
allow ranges to be disabled
* ov.cc, ov.h: Allow creation of range object to be disabled.
Also allow range objects to be forced, even when generally disabled.
* pt-exp.h (tree_expression::for_cmd_expr): New member variable.
(tree_expression::mark_as_for_cmd_expr,
tree_expression::is_for_cmd_expr): New functions.
* oct-parse.in.yy: Mark for command expressions.
* pt-colon.cc (tree_colon_expression::make_range): Force creation of
range if expression is a for command expression.
* basics.txi, numbers.txi: Document changes.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Mon, 08 Dec 2014 12:59:47 -0500 |
parents | ebb3ef964372 |
children | 4197fc428c7d |
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/* Copyright (C) 2008-2013 Jaroslav Hajek This file is part of Octave. Octave is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. Octave is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with Octave; see the file COPYING. If not, see <http://www.gnu.org/licenses/>. */ #if !defined (octave_ov_null_mat_h) #define octave_ov_null_mat_h 1 #include "ov.h" #include "ov-re-mat.h" #include "ov-str-mat.h" // Design rationale: // The constructors are hidden. There is only one null matrix (or null string) // object, that can have shallow copies. Cloning the object returns just a // normal empty matrix, so all the shallow copies are, in fact, read-only. This // conveniently ensures that any attempt to fiddle with the null matrix // destroys its special status. // The special [] value. class OCTINTERP_API octave_null_matrix : public octave_matrix { octave_null_matrix (void) : octave_matrix () { } public: static const octave_value instance; bool is_null_value (void) const { return true; } type_conv_info numeric_conversion_function (void) const; private: DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA }; // The special "" value class OCTINTERP_API octave_null_str : public octave_char_matrix_str { octave_null_str (void) : octave_char_matrix_str () { } public: static const octave_value instance; bool is_null_value (void) const { return true; } type_conv_info numeric_conversion_function (void) const; private: DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA }; // The special '' value class OCTINTERP_API octave_null_sq_str : public octave_char_matrix_sq_str { octave_null_sq_str (void) : octave_char_matrix_sq_str () { } public: static const octave_value instance; bool is_null_value (void) const { return true; } type_conv_info numeric_conversion_function (void) const; private: DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA }; #endif