is_virtual_base_of.hpp: Reinstate old version for old broken compilers.

This commit is contained in:
jzmaddock
2018-05-09 19:14:50 +01:00
parent 2cc2697e53
commit 63dea93d99

View File

@ -10,6 +10,7 @@
#define BOOST_TT_IS_VIRTUAL_BASE_OF_HPP_INCLUDED
#include <boost/type_traits/is_base_of.hpp>
#include <boost/type_traits/is_same.hpp>
namespace boost {
namespace detail {
@ -22,6 +23,8 @@ namespace detail {
#pragma GCC system_header
#endif
#if !defined(BOOST_NO_SFINAE_EXPR) && !defined(BOOST_NO_CXX11_FUNCTION_TEMPLATE_DEFAULT_ARGS) && !defined(BOOST_NO_CXX11_NULLPTR)
template<class Base, class Derived>
struct is_virtual_base_of_impl
{
@ -60,6 +63,84 @@ struct is_virtual_base_of_impl
template <class Base, class Derived> struct is_virtual_base_of : public integral_constant<bool, (::boost::detail::is_virtual_base_of_impl<Base, Derived>::value)>{};
#else
template<typename Base, typename Derived, typename tag>
struct is_virtual_base_of_impl
{
BOOST_STATIC_CONSTANT(bool, value = false);
};
template<typename Base, typename Derived>
struct is_virtual_base_of_impl<Base, Derived, true_type>
{
union max_align
{
unsigned u;
unsigned long ul;
void* v;
double d;
long double ld;
#ifndef BOOST_NO_LONG_LONG
long long ll;
#endif
};
#ifdef __BORLANDC__
struct boost_type_traits_internal_struct_X : public virtual Derived, public virtual Base
{
boost_type_traits_internal_struct_X();
boost_type_traits_internal_struct_X(const boost_type_traits_internal_struct_X&);
boost_type_traits_internal_struct_X& operator=(const boost_type_traits_internal_struct_X&);
~boost_type_traits_internal_struct_X()throw();
max_align data[4];
};
struct boost_type_traits_internal_struct_Y : public virtual Derived
{
boost_type_traits_internal_struct_Y();
boost_type_traits_internal_struct_Y(const boost_type_traits_internal_struct_Y&);
boost_type_traits_internal_struct_Y& operator=(const boost_type_traits_internal_struct_Y&);
~boost_type_traits_internal_struct_Y()throw();
max_align data[4];
};
#else
struct boost_type_traits_internal_struct_X : public Derived, virtual Base
{
boost_type_traits_internal_struct_X();
boost_type_traits_internal_struct_X(const boost_type_traits_internal_struct_X&);
boost_type_traits_internal_struct_X& operator=(const boost_type_traits_internal_struct_X&);
~boost_type_traits_internal_struct_X()throw();
max_align data[16];
};
struct boost_type_traits_internal_struct_Y : public Derived
{
boost_type_traits_internal_struct_Y();
boost_type_traits_internal_struct_Y(const boost_type_traits_internal_struct_Y&);
boost_type_traits_internal_struct_Y& operator=(const boost_type_traits_internal_struct_Y&);
~boost_type_traits_internal_struct_Y()throw();
max_align data[16];
};
#endif
BOOST_STATIC_CONSTANT(bool, value = (sizeof(boost_type_traits_internal_struct_X) == sizeof(boost_type_traits_internal_struct_Y)));
};
template<typename Base, typename Derived>
struct is_virtual_base_of_impl2
{
typedef boost::integral_constant<bool, (boost::is_base_of<Base, Derived>::value && !boost::is_same<Base, Derived>::value)> tag_type;
typedef is_virtual_base_of_impl<Base, Derived, tag_type> imp;
BOOST_STATIC_CONSTANT(bool, value = imp::value);
};
#ifdef BOOST_MSVC
#pragma warning( pop )
#endif
} // namespace detail
template <class Base, class Derived> struct is_virtual_base_of : public integral_constant<bool, (::boost::detail::is_virtual_base_of_impl2<Base, Derived>::value)> {};
#endif
template <class Base, class Derived> struct is_virtual_base_of<Base&, Derived> : public false_type{};
template <class Base, class Derived> struct is_virtual_base_of<Base, Derived&> : public false_type{};
template <class Base, class Derived> struct is_virtual_base_of<Base&, Derived&> : public false_type{};