Mercurial > octave
view libinterp/octave-value/ov-null-mat.h @ 31640:e518e1f7e944
Backed out changeset 34c3cd39c4b9
Revert change because there is code that uses gui_pref.ignore, but
only on MAC_OS: global_use_native_dialogs in
gui-preferences-global.h. Are there others?
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Mon, 05 Dec 2022 10:17:17 -0500 |
parents | 796f54d4ddbf |
children | 597f3ee61a48 |
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//////////////////////////////////////////////////////////////////////// // // Copyright (C) 2008-2022 The Octave Project Developers // // See the file COPYRIGHT.md in the top-level directory of this // distribution or <https://octave.org/copyright/>. // // 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 // <https://www.gnu.org/licenses/>. // //////////////////////////////////////////////////////////////////////// #if ! defined (octave_ov_null_mat_h) #define octave_ov_null_mat_h 1 #include "octave-config.h" #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 isnull (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_storable (void) const { return false; } bool isnull (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_storable (void) const { return false; } bool isnull (void) const { return true; } type_conv_info numeric_conversion_function (void) const; private: DECLARE_OV_TYPEID_FUNCTIONS_AND_DATA }; #endif