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annotate liboctave/util/functor.h @ 23084:ef4d915df748

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maint: Merge stable to default.
author John W. Eaton <jwe@octave.org>
date Mon, 23 Jan 2017 14:27:48 -0500
parents 3a2b891d0b33 e9a0469dedd9
children 092078913d54
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1 /*
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2
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3 Copyright (C) 2008-2016 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
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9 the Free Software Foundation; either version 3 of the License, or
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10 (at your 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
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13 WITHOUT ANY WARRANTY; without even the implied warranty of
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14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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15 GNU General Public License 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 #include "octave-config.h"
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27
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28 template <typename RT, typename PT>
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29 class fcn_ptr
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30 {
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31 public:
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32 typedef RT (*TYPE) (PT);
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33 };
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34
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35 template <typename RT, typename PT>
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36 class functor
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37 {
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38 private:
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39 typedef typename fcn_ptr<RT, PT>::TYPE fcn_ptr_type;
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40 fcn_ptr_type fptr;
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41
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42 public:
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43
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44 functor (fcn_ptr_type p) : fptr (p) { }
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45
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46 RT operator () (PT arg) { return fptr (arg); }
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47 };
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48
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49 template <typename CT, typename RT, typename PT>
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50 class functor_with_conversion
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51 {
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52 private:
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53 typedef typename fcn_ptr<RT, PT>::TYPE fcn_ptr_type;
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54 fcn_ptr_type fptr;
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55
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56 public:
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57
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58 functor_with_conversion (fcn_ptr_type p) : fptr (p) { }
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59
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60 CT operator () (PT arg) { return CT (fptr (arg)); }
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61 };
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62
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63 template <typename RT, typename PT>
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64 functor<RT, PT>
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65 func_ptr (RT (*f) (PT))
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66 {
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67 return functor<RT, PT> (f);
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68 }
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69
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70 template <typename CT, typename RT, typename PT>
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71 functor_with_conversion<CT, RT, PT>
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72 func_ptr_with_conversion (RT (*f) (PT))
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73 {
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74 return functor_with_conversion<CT, RT, PT> (f);
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75 }
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76
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77 #endif