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2 | // Copyright 2000 John Maddock (john@johnmaddock.co.uk)
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3 | // Copyright 2002 Aleksey Gurtovoy (agurtovoy@meta-comm.com)
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4 | //
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5 | // Use, modification and distribution are subject to the Boost Software License,
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6 | // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
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7 | // http://www.boost.org/LICENSE_1_0.txt).
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8 | //
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9 | // See http://www.boost.org/libs/type_traits for most recent version including documentation.
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10 |
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11 | #ifndef BOOST_TT_IS_FUNCTION_HPP_INCLUDED
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12 | #define BOOST_TT_IS_FUNCTION_HPP_INCLUDED
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13 |
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14 | #include "boost/type_traits/is_reference.hpp"
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15 | #include "boost/type_traits/detail/false_result.hpp"
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16 | #include "boost/config.hpp"
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17 |
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18 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
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19 | # include "boost/type_traits/detail/is_function_ptr_helper.hpp"
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20 | #else
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21 | # include "boost/type_traits/detail/is_function_ptr_tester.hpp"
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22 | # include "boost/type_traits/detail/yes_no_type.hpp"
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23 | #endif
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24 |
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25 | // should be the last #include
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26 | #include "boost/type_traits/detail/bool_trait_def.hpp"
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27 |
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28 | // is a type a function?
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29 | // Please note that this implementation is unnecessarily complex:
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30 | // we could just use !is_convertible<T*, const volatile void*>::value,
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31 | // except that some compilers erroneously allow conversions from
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32 | // function pointers to void*.
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33 |
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34 | namespace boost {
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35 | namespace detail {
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36 |
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37 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
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38 | template<bool is_ref = true>
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39 | struct is_function_chooser
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40 | : ::boost::type_traits::false_result
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41 | {
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42 | };
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43 |
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44 | template <>
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45 | struct is_function_chooser<false>
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46 | {
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47 | template< typename T > struct result_
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48 | : ::boost::type_traits::is_function_ptr_helper<T*>
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49 | {
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50 | };
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51 | };
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52 |
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53 | template <typename T>
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54 | struct is_function_impl
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55 | : is_function_chooser< ::boost::is_reference<T>::value >
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56 | ::BOOST_NESTED_TEMPLATE result_<T>
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57 | {
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58 | };
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59 |
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60 | #else
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61 |
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62 | template <typename T>
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63 | struct is_function_impl
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64 | {
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65 | static T* t;
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66 | BOOST_STATIC_CONSTANT(
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67 | bool, value = sizeof(::boost::type_traits::is_function_ptr_tester(t))
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68 | == sizeof(::boost::type_traits::yes_type)
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69 | );
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70 | };
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71 |
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72 | #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION)
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73 | template <typename T>
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74 | struct is_function_impl<T&> : public false_type
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75 | {};
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76 | #endif
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77 |
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78 | #endif
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79 |
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80 | } // namespace detail
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81 |
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82 | BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_function,T,::boost::detail::is_function_impl<T>::value)
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83 |
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84 | } // namespace boost
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85 |
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86 | #include "boost/type_traits/detail/bool_trait_undef.hpp"
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87 |
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88 | #endif // BOOST_TT_IS_FUNCTION_HPP_INCLUDED
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