Mercurial > octave
view libinterp/octave-value/ov-null-mat.cc @ 21231:5f318c8ec634
eliminate feature tests from lo-specfun.h
* lo-specfun.h, lo-specfun.cc (xacosh, xasinh, xatanh, xerf, xerfc
xexpm1, xlog1p, xcbrt): Rename to have 'x' prefix. Conditionally
define in .cc file. Change all uses Move complex versions of acosh,
asinh, and atanh functions here.
author | John W. Eaton <jwe@octave.org> |
---|---|
date | Tue, 09 Feb 2016 04:15:50 -0500 |
parents | fcac5dbbf9ed |
children | 40de9f8f23a6 |
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/* Copyright (C) 2008-2015 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/>. */ #ifdef HAVE_CONFIG_H # include <config.h> #endif #include "ov-null-mat.h" #include "ops.h" #include "defun.h" DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_matrix, "null_matrix", "double"); const octave_value octave_null_matrix::instance (new octave_null_matrix ()); static octave_base_value * default_null_matrix_numeric_conversion_function (const octave_base_value& a) { // The cast is not necessary? // CAST_CONV_ARG (const octave_null_matrix&); return a.empty_clone (); } octave_base_value::type_conv_info octave_null_matrix::numeric_conversion_function (void) const { return octave_base_value::type_conv_info (default_null_matrix_numeric_conversion_function, octave_matrix::static_type_id ()); } DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_str, "null_string", "char"); const octave_value octave_null_str::instance (new octave_null_str ()); static octave_base_value * default_null_str_numeric_conversion_function (const octave_base_value& a) { // The cast is not necessary? // CAST_CONV_ARG (const octave_null_str&); return a.empty_clone (); } octave_base_value::type_conv_info octave_null_str::numeric_conversion_function (void) const { return octave_base_value::type_conv_info (default_null_str_numeric_conversion_function, octave_char_matrix_str::static_type_id ()); } DEFINE_OV_TYPEID_FUNCTIONS_AND_DATA (octave_null_sq_str, "null_sq_string", "char"); const octave_value octave_null_sq_str::instance (new octave_null_sq_str ()); static octave_base_value * default_null_sq_str_numeric_conversion_function (const octave_base_value& a) { // The cast is not necessary? // CAST_CONV_ARG (const octave_null_sq_str&); return a.empty_clone (); } octave_base_value::type_conv_info octave_null_sq_str::numeric_conversion_function (void) const { return octave_base_value::type_conv_info (default_null_sq_str_numeric_conversion_function, octave_char_matrix_sq_str::static_type_id ()); } DEFUN (isnull, args, , "-*- texinfo -*-\n\ @deftypefn {} {} isnull (@var{x})\n\ Return true if @var{x} is a special null matrix, string, or single quoted\n\ string.\n\ \n\ Indexed assignment with such a value on the right-hand side should delete\n\ array elements. This function should be used when overloading indexed\n\ assignment for user-defined classes instead of @code{isempty}, to\n\ distinguish the cases:\n\ \n\ @table @asis\n\ @item @code{A(I) = []}\n\ This should delete elements if @code{I} is nonempty.\n\ \n\ @item @code{X = []; A(I) = X}\n\ This should give an error if @code{I} is nonempty.\n\ @end table\n\ @seealso{isempty, isindex}\n\ @end deftypefn") { if (args.length () != 1) print_usage (); return ovl (args(0).is_null_value ()); } /* %!assert (isnull ([]), true) %!assert (isnull ([1]), false) %!assert (isnull (zeros (0,3)), false) %!assert (isnull (""), true) %!assert (isnull ("A"), false) %!assert (isnull (''), true) %!assert (isnull ('A'), false) %!test %! x = []; %! assert (isnull (x), false); */