Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+//  (C) Copyright John Maddock 2000. 
+//  Use, modification and distribution are subject to the Boost Software License,
+//  Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at
+//  http://www.boost.org/LICENSE_1_0.txt).
+//
+//  See http://www.boost.org/libs/type_traits for most recent version including documentation.
+
+#ifndef BOOST_TT_IS_POLYMORPHIC_HPP
+#define BOOST_TT_IS_POLYMORPHIC_HPP
+
+#include <boost/type_traits/intrinsics.hpp>
+#include <boost/type_traits/integral_constant.hpp>
+#ifndef BOOST_IS_POLYMORPHIC
+#include <boost/type_traits/is_class.hpp>
+#endif
+#include <boost/detail/workaround.hpp>
+
+#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1700)
+#pragma warning(push)
+#pragma warning(disable:4250)
+#endif
+
+namespace boost{
+
+#ifndef BOOST_IS_POLYMORPHIC
+
+namespace detail{
+
+template <class T>
+struct is_polymorphic_imp1
+{
+# if BOOST_WORKAROUND(__MWERKS__, <= 0x2407) // CWPro7 should return false always.
+    typedef char d1, (&d2)[2];
+# else 
+   struct d1 : public T
+   {
+      d1();
+#  if !defined(__GNUC__) // this raises warnings with some classes, and buys nothing with GCC
+      ~d1()throw();
+#  endif 
+      char padding[256];
+   private:
+      // keep some picky compilers happy:
+      d1(const d1&);
+      d1& operator=(const d1&);
+   };
+   struct d2 : public T
+   {
+      d2();
+      virtual ~d2()throw();
+#  if !defined(BOOST_MSVC) && !defined(__ICL)
+      // for some reason this messes up VC++ when T has virtual bases,
+      // probably likewise for compilers that use the same ABI:
+      struct unique{};
+      virtual void unique_name_to_boost5487629(unique*);
+#  endif
+      char padding[256];
+   private:
+      // keep some picky compilers happy:
+      d2(const d2&);
+      d2& operator=(const d2&);
+   };
+# endif 
+   BOOST_STATIC_CONSTANT(bool, value = (sizeof(d2) == sizeof(d1)));
+};
+
+template <class T> struct is_polymorphic_imp1<T const> : public is_polymorphic_imp1<T>{};
+template <class T> struct is_polymorphic_imp1<T const volatile> : public is_polymorphic_imp1<T>{};
+template <class T> struct is_polymorphic_imp1<T volatile> : public is_polymorphic_imp1<T>{};
+
+template <class T>
+struct is_polymorphic_imp2
+{
+   BOOST_STATIC_CONSTANT(bool, value = false);
+};
+
+template <bool is_class>
+struct is_polymorphic_selector
+{
+   template <class T>
+   struct rebind
+   {
+      typedef is_polymorphic_imp2<T> type;
+   };
+};
+
+template <>
+struct is_polymorphic_selector<true>
+{
+   template <class T>
+   struct rebind
+   {
+      typedef is_polymorphic_imp1<T> type;
+   };
+};
+
+template <class T>
+struct is_polymorphic_imp
+{
+   typedef is_polymorphic_selector< ::boost::is_class<T>::value> selector;
+   typedef typename selector::template rebind<T> binder;
+   typedef typename binder::type imp_type;
+   BOOST_STATIC_CONSTANT(bool, value = imp_type::value);
+};
+
+} // namespace detail
+
+template <class T> struct is_polymorphic : public integral_constant<bool, ::boost::detail::is_polymorphic_imp<T>::value> {};
+
+#else // BOOST_IS_POLYMORPHIC
+
+template <class T> struct is_polymorphic : public integral_constant<bool, BOOST_IS_POLYMORPHIC(T)> {};
+
+#endif
+
+} // namespace boost
+
+#if defined(BOOST_MSVC) && (BOOST_MSVC >= 1700)
+#pragma warning(pop)
+#endif
+
+#endif