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annotate liboctave/util/functor.h @ 20595:c1a6c31ac29a

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eliminate more simple uses of error_state * ov-classdef.cc: Eliminate simple uses of error_state.
author John W. Eaton <jwe@octave.org>
date Tue, 06 Oct 2015 00:20:02 -0400
parents 4197fc428c7d
children
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1 /*
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2
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4197fc428c7d maint: Update copyright notices for 2015.
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3 Copyright (C) 2008-2015 John W. Eaton
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4
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5 This file is part of Octave.
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6
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7 Octave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Octave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Octave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if !defined (octave_functor_h)
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24 #define octave_functor_h 1
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25
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26 template <typename RT, typename PT>
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27 class fcn_ptr
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28 {
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29 public:
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30 typedef RT (*TYPE) (PT);
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31 };
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32
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33 template <typename RT, typename PT>
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34 class functor
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35 {
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36 private:
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37 typedef typename fcn_ptr<RT, PT>::TYPE fcn_ptr_type;
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38 fcn_ptr_type fptr;
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39
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40 public:
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41
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42 functor (fcn_ptr_type p) : fptr (p) { }
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43
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44 RT operator () (PT arg) { return fptr (arg); }
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45 };
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46
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47 template <typename CT, typename RT, typename PT>
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48 class functor_with_conversion
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49 {
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50 private:
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51 typedef typename fcn_ptr<RT, PT>::TYPE fcn_ptr_type;
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52 fcn_ptr_type fptr;
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53
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54 public:
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55
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56 functor_with_conversion (fcn_ptr_type p) : fptr (p) { }
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57
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58 CT operator () (PT arg) { return CT (fptr (arg)); }
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59 };
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60
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61 template <typename RT, typename PT>
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62 functor<RT, PT>
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63 func_ptr (RT (*f) (PT))
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64 {
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65 return functor<RT, PT> (f);
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66 }
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67
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68 template <typename CT, typename RT, typename PT>
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69 functor_with_conversion<CT, RT, PT>
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70 func_ptr_with_conversion (RT (*f) (PT))
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71 {
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72 return functor_with_conversion<CT, RT, PT> (f);
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73 }
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74
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75 #endif