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template <class T>
struct has_virtual_destructor : public true_type-or-false_type {};
Inherits: If T is a (possibly cv-qualified) type with a virtual destructor then inherits from true_type, otherwise inherits from false_type.
        Compiler Compatibility: There is currently
        no way to portably implement this trait: the default version always inherits
        from false_type,
        and has to be explicitly specialized for types with virtual destructors unless
        the compiler used has compiler intrinsics
        that enable the trait to do the right thing: Currently (June 2015) compilers
        more recent than Visual C++ 8, GCC-4.3, Greenhills 6.0, Intel-11.0, plus
        Codegear and Clang have the necessary compiler intrinsics
        to ensure that this trait "just works". You may also test to see
        if the necessary intrinsics
        are available by checking to see if the macro BOOST_HAS_VIRTUAL_DESTRUCTOR
        is defined.
      
C++ Standard Reference: 12.4.
        Header:  #include
        <boost/type_traits/has_virtual_destructor.hpp>
        or  #include <boost/type_traits.hpp>