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1 ## Copyright (C) 2000 Etienne Grossmann |
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2 ## |
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3 ## This file is part of Octave. |
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4 ## |
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5 ## Octave is free software; you can redistribute it and/or modify it |
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6 ## under the terms of the GNU General Public License as published by |
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7 ## the Free Software Foundation; either version 2, or (at your option) |
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8 ## any later version. |
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9 ## |
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10 ## Octave is distributed in the hope that it will be useful, but |
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11 ## WITHOUT ANY WARRANTY; without even the implied warranty of |
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12 ## MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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13 ## General Public License for more details. |
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14 ## |
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15 ## You should have received a copy of the GNU General Public License |
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16 ## along with Octave; see the file COPYING. If not, write to the Free |
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17 ## Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
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18 ## 02110-1301, USA. |
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19 |
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20 ## -*- texinfo -*- |
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21 ## @deftypefn {Function File} {[@var{v1}, @dots{}] =} getfield (@var{s}, @var{key}, @dots{}) |
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22 ## Extract fields from a structure. For example |
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23 ## |
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24 ## @example |
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25 ## @group |
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26 ## ss(1,2).fd(3).b=5; |
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27 ## getfield (ss, @{1,2@}, "fd", @{3@}, "b") |
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28 ## @result{} ans = 5 |
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29 ## @end group |
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30 ## @end example |
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31 ## |
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32 ## Note that the function call in the previous example is equivalent to |
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33 ## the expression |
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34 ## |
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35 ## @example |
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36 ## i1= @{1,2@}; i2= "fd"; i3= @{3@}; i4= "b"; |
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37 ## ss(i1@{:@}).(i2)(i3@{:@}).(i4) |
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38 ## @end example |
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39 ## @seealso{setfield, rmfield, isfield, isstruct, fieldnames, struct} |
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40 ## @end deftypefn |
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41 |
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42 ## Author: Etienne Grossmann <etienne@cs.uky.edu> |
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43 |
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44 function s = getfield (s, varargin) |
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45 |
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46 for idx = 1:nargin-1 |
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47 i = varargin{idx}; |
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48 if (iscell (i)) |
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49 s = s(i{:}); |
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50 else |
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51 s = s.(i); |
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52 endif |
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53 endfor |
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54 |
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55 endfunction |
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56 |
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57 %!test |
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58 %! x.a = "hello"; |
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59 %! assert(getfield(x,"a"),"hello"); |
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60 %!test |
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61 %! ss(1,2).fd(3).b = 5; |
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62 %! assert(getfield(ss,{1,2},'fd',{3},'b'),5) |
