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1 // Copyright David Abrahams 2002.
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2 // Distributed under the Boost Software License, Version 1.0. (See
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3 // accompanying file LICENSE_1_0.txt or copy at
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4 // http://www.boost.org/LICENSE_1_0.txt)
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5 #ifndef DESTROY_DWA2002221_HPP
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6 # define DESTROY_DWA2002221_HPP
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7
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8 # include <boost/type_traits/is_array.hpp>
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9 # include <boost/detail/workaround.hpp>
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10 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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11 # include <boost/type_traits/is_enum.hpp>
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12 # endif
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13 namespace boost { namespace python { namespace detail {
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14
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15 template <
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16 bool array
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17 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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18 , bool enum_ // vc7 has a problem destroying enums
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19 # endif
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20 > struct value_destroyer;
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21
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22 template <>
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23 struct value_destroyer<
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24 false
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25 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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26 , false
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27 # endif
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28 >
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29 {
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30 template <class T>
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31 static void execute(T const volatile* p)
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32 {
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33 p->~T();
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34 }
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35 };
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36
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37 template <>
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38 struct value_destroyer<
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39 true
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40 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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41 , false
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42 # endif
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43 >
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44 {
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45 template <class A, class T>
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46 static void execute(A*, T const volatile* const first)
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47 {
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48 for (T const volatile* p = first; p != first + sizeof(A)/sizeof(T); ++p)
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49 {
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50 value_destroyer<
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51 boost::is_array<T>::value
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52 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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53 , boost::is_enum<T>::value
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54 # endif
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55 >::execute(p);
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56 }
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57 }
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58
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59 template <class T>
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60 static void execute(T const volatile* p)
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61 {
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62 execute(p, *p);
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63 }
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64 };
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65
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66 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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67 template <>
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68 struct value_destroyer<true,true>
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69 {
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70 template <class T>
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71 static void execute(T const volatile*)
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72 {
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73 }
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74 };
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75
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76 template <>
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77 struct value_destroyer<false,true>
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78 {
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79 template <class T>
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80 static void execute(T const volatile*)
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81 {
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82 }
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83 };
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84 # endif
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85 template <class T>
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86 inline void destroy_referent_impl(void* p, T& (*)())
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87 {
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88 // note: cv-qualification needed for MSVC6
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89 // must come *before* T for metrowerks
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90 value_destroyer<
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91 (boost::is_array<T>::value)
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92 # if BOOST_WORKAROUND(BOOST_MSVC, == 1300)
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93 , (boost::is_enum<T>::value)
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94 # endif
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95 >::execute((const volatile T*)p);
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96 }
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97
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98 template <class T>
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99 inline void destroy_referent(void* p, T(*)() = 0)
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100 {
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101 destroy_referent_impl(p, (T(*)())0);
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102 }
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103
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104 }}} // namespace boost::python::detail
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105
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106 #endif // DESTROY_DWA2002221_HPP
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