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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 STRING_LITERAL_DWA2002629_HPP
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6 # define STRING_LITERAL_DWA2002629_HPP
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7
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8 # include <cstddef>
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9 # include <boost/type.hpp>
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10 # include <boost/type_traits/array_traits.hpp>
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11 # include <boost/type_traits/same_traits.hpp>
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12 # include <boost/mpl/bool.hpp>
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13 # include <boost/detail/workaround.hpp>
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14
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15 namespace boost { namespace python { namespace detail {
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16
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17 # ifndef BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION
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18 template <class T>
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19 struct is_string_literal : mpl::false_
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20 {
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21 };
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22
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23 # if !defined(__MWERKS__) || __MWERKS__ > 0x2407
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24 template <std::size_t n>
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25 struct is_string_literal<char const[n]> : mpl::true_
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26 {
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27 };
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28
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29 # if BOOST_WORKAROUND(__DECCXX_VER, BOOST_TESTED_AT(60590040)) \
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30 || (defined(__sgi) && defined(_COMPILER_VERSION) && _COMPILER_VERSION <= 730)
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31 // This compiler mistakenly gets the type of string literals as char*
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32 // instead of char[NN].
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33 template <>
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34 struct is_string_literal<char* const> : mpl::true_
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35 {
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36 };
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37 # endif
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38
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39 # else
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40
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41 // CWPro7 has trouble with the array type deduction above
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42 template <class T, std::size_t n>
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43 struct is_string_literal<T[n]>
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44 : is_same<T, char const>
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45 {
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46 };
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47 # endif
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48 # else
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49 template <bool is_array = true>
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50 struct string_literal_helper
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51 {
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52 typedef char (&yes_string_literal)[1];
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53 typedef char (&no_string_literal)[2];
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54
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55 template <class T>
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56 struct apply
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57 {
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58 typedef apply<T> self;
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59 static T x;
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60 static yes_string_literal check(char const*);
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61 static no_string_literal check(char*);
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62 static no_string_literal check(void const volatile*);
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63
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64 BOOST_STATIC_CONSTANT(
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65 bool, value = sizeof(self::check(x)) == sizeof(yes_string_literal));
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66 typedef mpl::bool_<value> type;
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67 };
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68 };
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69
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70 template <>
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71 struct string_literal_helper<false>
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72 {
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73 template <class T>
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74 struct apply : mpl::false_
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75 {
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76 };
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77 };
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78
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79 template <class T>
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80 struct is_string_literal
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81 : string_literal_helper<is_array<T>::value>::apply<T>
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82 {
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83 };
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84 # endif
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85
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86 }}} // namespace boost::python::detail
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87
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88 #endif // STRING_LITERAL_DWA2002629_HPP
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