ceph/src/boost/boost/type_traits/is_function.hpp

   1
   2 //  Copyright 2000 John Maddock (john@johnmaddock.co.uk)
   3 //  Copyright 2002 Aleksey Gurtovoy (agurtovoy@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/config.hpp>
  16
  17 #if !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
  18 #   include <boost/type_traits/detail/is_function_ptr_helper.hpp>
  19 #else
  20 #   include <boost/type_traits/detail/is_function_ptr_tester.hpp>
  21 #   include <boost/type_traits/detail/yes_no_type.hpp>
  22 #endif
  23
  24 // is a type a function?
  25 // Please note that this implementation is unnecessarily complex:
  26 // we could just use !is_convertible<T*, const volatile void*>::value,
  27 // except that some compilers erroneously allow conversions from
  28 // function pointers to void*.
  29
  30 namespace boost {
  31
  32 #if !defined( __CODEGEARC__ )
  33
  34 namespace detail {
  35
  36 #if !defined(BOOST_TT_TEST_MS_FUNC_SIGS)
  37 template<bool is_ref = true>
  38 struct is_function_chooser
  39 {
  40    template< typename T > struct result_
  41       : public false_type {};
  42 };
  43
  44 template <>
  45 struct is_function_chooser<false>
  46 {
  47     template< typename T > struct result_
  48         : public ::boost::type_traits::is_function_ptr_helper<T*> {};
  49 };
  50
  51 template <typename T>
  52 struct is_function_impl
  53     : public is_function_chooser< ::boost::is_reference<T>::value >
  54         ::BOOST_NESTED_TEMPLATE result_<T>
  55 {
  56 };
  57
  58 #else
  59
  60 template <typename T>
  61 struct is_function_impl
  62 {
  63 #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
  64 #pragma warning(push)
  65 #pragma warning(disable:6334)
  66 #endif
  67     static T* t;
  68     BOOST_STATIC_CONSTANT(
  69         bool, value = sizeof(::boost::type_traits::is_function_ptr_tester(t))
  70         == sizeof(::boost::type_traits::yes_type)
  71         );
  72 #if BOOST_WORKAROUND(BOOST_MSVC_FULL_VER, >= 140050000)
  73 #pragma warning(pop)
  74 #endif
  75 };
  76
  77 template <typename T>
  78 struct is_function_impl<T&> : public false_type
  79 {};
  80 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  81 template <typename T>
  82 struct is_function_impl<T&&> : public false_type
  83 {};
  84 #endif
  85
  86 #endif
  87
  88 } // namespace detail
  89
  90 #endif // !defined( __CODEGEARC__ )
  91
  92 #if defined( __CODEGEARC__ )
  93 template <class T> struct is_function : integral_constant<bool, __is_function(T)> {};
  94 #else
  95 template <class T> struct is_function : integral_constant<bool, ::boost::detail::is_function_impl<T>::value> {};
  96 #ifndef BOOST_NO_CXX11_RVALUE_REFERENCES
  97 template <class T> struct is_function<T&&> : public false_type {};
  98 #endif
  99 #endif
 100 } // namespace boost
 101
 102 #endif // BOOST_TT_IS_FUNCTION_HPP_INCLUDED