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1 /* |
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2 |
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3 Copyright (C) 2009 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_liboctave_traits_h) |
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24 #define octave_liboctave_traits_h 1 |
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25 |
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26 template <bool cond, typename T1, typename T2> |
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27 class if_then_else; |
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28 |
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29 template<typename T1, typename T2> |
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30 class if_then_else<true, T1, T2> |
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31 { |
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32 public: |
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33 |
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34 typedef T1 result; |
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35 }; |
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36 |
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37 template<typename T1, typename T2> |
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38 class if_then_else<false, T1, T2> |
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39 { |
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40 public: |
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41 |
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42 typedef T2 result; |
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43 }; |
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44 |
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45 template<typename T1> |
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46 class is_class_type |
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47 { |
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48 private: |
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49 |
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50 typedef char one; |
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51 typedef struct { char c[2]; } two; |
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52 |
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53 // Classes can have pointers to members. |
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54 template<typename T2> static one is_class_type_test (int T2::*); |
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55 |
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56 // Catch everything else. |
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57 template<typename T2> static two is_class_type_test (...); |
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58 |
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59 public: |
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60 |
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61 enum { yes = sizeof (is_class_type_test<T1> (0)) == 1 }; |
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62 enum { no = ! yes }; |
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63 }; |
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64 |
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65 template<typename T> |
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66 class ref_param |
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67 { |
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68 public: |
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69 |
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70 typedef typename if_then_else<is_class_type<T>::no, T, T const&>::result type; |
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71 }; |
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72 |
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73 #endif |
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74 |
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75 /* |
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76 ;;; Local Variables: *** |
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77 ;;; mode: C *** |
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78 ;;; page-delimiter: "^/\\*" *** |
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79 ;;; End: *** |
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80 */ |
