1 2 // Copyright 2000 John Maddock (john (at) johnmaddock.co.uk) 3 // Copyright 2002 Aleksey Gurtovoy (agurtovoy (at) meta-comm.com) 4 // 5 // Use, modification and distribution are subject to the Boost Software License, 6 // Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at 7 // http://www.boost.org/LICENSE_1_0.txt). 8 // 9 // See http://www.boost.org/libs/type_traits for most recent version including documentation. 10 11 #ifndef BOOST_TT_IS_FUNCTION_HPP_INCLUDED 12 #define BOOST_TT_IS_FUNCTION_HPP_INCLUDED 13 14 #include <boost/type_traits/is_reference.hpp> 15 #include <boost/type_traits/detail/false_result.hpp> 16 #include <boost/config.hpp> 17 18 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_TT_TEST_MS_FUNC_SIGS) 19 # include <boost/type_traits/detail/is_function_ptr_helper.hpp> 20 #else 21 # include <boost/type_traits/detail/is_function_ptr_tester.hpp> 22 # include <boost/type_traits/detail/yes_no_type.hpp> 23 #endif 24 25 // should be the last #include 26 #include <boost/type_traits/detail/bool_trait_def.hpp> 27 28 // is a type a function? 29 // Please note that this implementation is unnecessarily complex: 30 // we could just use !is_convertible<T*, const volatile void*>::value, 31 // except that some compilers erroneously allow conversions from 32 // function pointers to void*. 33 34 namespace boost { 35 36 #if !defined( __CODEGEARC__ ) 37 38 namespace detail { 39 40 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) && !defined(BOOST_TT_TEST_MS_FUNC_SIGS) 41 template<bool is_ref = true> 42 struct is_function_chooser 43 : public ::boost::type_traits::false_result 44 { 45 }; 46 47 template <> 48 struct is_function_chooser<false> 49 { 50 template< typename T > struct result_ 51 : public ::boost::type_traits::is_function_ptr_helper<T*> 52 { 53 }; 54 }; 55 56 template <typename T> 57 struct is_function_impl 58 : public is_function_chooser< ::boost::is_reference<T>::value > 59 ::BOOST_NESTED_TEMPLATE result_<T> 60 { 61 }; 62 63 #else 64 65 template <typename T> 66 struct is_function_impl 67 { 68 #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000) 69 #pragma warning(push) 70 #pragma warning(disable:6334) 71 #endif 72 static T* t; 73 BOOST_STATIC_CONSTANT( 74 bool, value = sizeof(::boost::type_traits::is_function_ptr_tester(t)) 75 == sizeof(::boost::type_traits::yes_type) 76 ); 77 #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000) 78 #pragma warning(pop) 79 #endif 80 }; 81 82 #if !defined(BOOST_NO_TEMPLATE_PARTIAL_SPECIALIZATION) 83 template <typename T> 84 struct is_function_impl<T&> : public false_type 85 {}; 86 #endif 87 88 #endif 89 90 } // namespace detail 91 92 #endif // !defined( __CODEGEARC__ ) 93 94 #if defined( __CODEGEARC__ ) 95 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_function,T,__is_function(T)) 96 #else 97 BOOST_TT_AUX_BOOL_TRAIT_DEF1(is_function,T,::boost::detail::is_function_impl<T>::value) 98 #ifndef BOOST_NO_RVALUE_REFERENCES 99 BOOST_TT_AUX_BOOL_TRAIT_PARTIAL_SPEC1_1(typename T,is_function,T&&,false) 100 #endif 101 #endif 102 } // namespace boost 103 104 #include <boost/type_traits/detail/bool_trait_undef.hpp> 105 106 #endif // BOOST_TT_IS_FUNCTION_HPP_INCLUDED 107
