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1 ## Copyright (C) 2010 John W. Eaton |
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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 3 of the License, or (at |
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8 ## your option) 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, see |
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17 ## <http://www.gnu.org/licenses/>. |
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18 |
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19 ## -*- texinfo -*- |
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20 ## @deftypefn {Loadable Function} {} dispatch (@var{f}, @var{r}, @var{type}) |
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21 ## |
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22 ## Replace the function @var{f} with a dispatch so that function @var{r} |
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23 ## is called when @var{f} is called with the first argument of the named |
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24 ## @var{type}. If the type is @var{any} then call @var{r} if no other type |
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25 ## matches. The original function @var{f} is accessible using |
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26 ## @code{builtin (@var{f}, @dots{})}. |
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27 ## |
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28 ## If @var{r} is omitted, clear dispatch function associated with @var{type}. |
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29 ## |
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30 ## If both @var{r} and @var{type} are omitted, list dispatch functions |
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31 ## for @var{f}. |
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32 ## @seealso{builtin} |
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33 ## @end deftypefn |
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34 |
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35 ## Deprecated in version 3.4 |
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36 |
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37 function varargout = dispatch (varargin) |
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38 |
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39 persistent warned = false; |
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40 if (! warned) |
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41 warned = true; |
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42 warning ("Octave:deprecated-function", |
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43 "dispatch is obsolete and will be removed from a future version of Octave; please use classes instead"); |
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44 endif |
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45 |
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46 varargout = cell (nargout, 1); |
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47 [ varargout{:} ] = __dispatch__ (varargin{:}); |
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48 |
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49 endfunction |
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50 |
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51 |
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52 %!test # builtin function replacement |
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53 %! warning off Octave:deprecated-function |
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54 %! dispatch('sin','length','string') |
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55 %! assert(sin("abc"),3) |
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56 %! assert(sin(0),0,10*eps); |
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57 %!test # 'any' function |
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58 %! warning off Octave:deprecated-function |
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59 %! dispatch('sin','exp','any') |
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60 %! assert(sin(0),1,eps); |
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61 %! assert(sin("abc"),3); |
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62 %!test # 'builtin' function |
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63 %! warning off Octave:deprecated-function |
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64 %! assert(builtin('sin',0),0,eps); |
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65 %! builtin('eval','x=1;'); |
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66 %! assert(x,1); |
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67 %!test # clear function mapping |
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68 %! warning off Octave:deprecated-function |
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69 %! dispatch('sin','string') |
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70 %! dispatch('sin','any') |
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71 %! assert(sin(0),0,10*eps); |
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72 %!test # oct-file replacement |
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73 %! warning off Octave:deprecated-function |
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74 %! dispatch('fft','length','string') |
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75 %! assert(fft([1,1]),[2,0]); |
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76 %! assert(fft("abc"),3) |
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77 %! dispatch('fft','string'); |
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78 %!test # m-file replacement |
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79 %! warning off Octave:deprecated-function |
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80 %! dispatch('hamming','length','string') |
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81 %! assert(hamming(1),1) |
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82 %! assert(hamming("abc"),3) |
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83 %! dispatch('hamming','string') |
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84 |
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85 %!test # override preloaded builtin |
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86 %! warning off Octave:deprecated-function |
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87 %! evalin('base','cos(1);'); |
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88 %! dispatch('cos','length','string') |
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89 %! evalin('base','assert(cos("abc"),3)'); |
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90 %! evalin('base','assert(cos(0),1,eps)'); |
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91 %! dispatch('cos','string') |
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92 %!test # override pre-loaded oct-file |
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93 %! warning off Octave:deprecated-function |
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94 %! evalin('base','qr(1);'); |
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95 %! dispatch('qr','length','string') |
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96 %! evalin('base','assert(qr("abc"),3)'); |
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97 %! evalin('base','assert(qr(1),1)'); |
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98 %! dispatch('qr','string'); |
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99 %!test # override pre-loaded m-file |
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100 %! warning off Octave:deprecated-function |
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101 %! evalin('base','hanning(1);'); |
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102 %! dispatch('hanning','length','string') |
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103 %! evalin('base','assert(hanning("abc"),3)'); |
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104 %! evalin('base','assert(hanning(1),1)'); |
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105 %! dispatch('hanning','string'); |
