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template <class T>
struct is_final : public true_type-or-false_type {};
Inherits: If T is a (possibly cv-qualified) class type declared with the final specifier type then inherits from true_type, otherwise inherits from false_type. Currently requires some kind of compiler support.
C++ Standard Reference: 9p3.
        Compiler Compatibility: Without (some as
        yet unspecified) help from the compiler, we cannot detect class types declared
        with the final specifier using only standard C++, as a result this type will
        never inherit from true_type,
        unless the user explicitly specializes the template for their user-defined
        final class types, or unless the compiler supplies some unspecified intrinsic
        that implements this functionality. Currently (June 2015) compilers more
        recent than GCC-4.7, Oracle-12.4, 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_IS_FINAL
        is defined.
      
        Header:  #include
        <boost/type_traits/is_final.hpp>
        or  #include <boost/type_traits.hpp>
      
Examples:
        Given struct my_final
        final {};
        then:
      
is_final<my_final>inherits fromtrue_type.
is_final<const my_final>::typeis the typetrue_type.
is_final<my_final>::valueis an integral constant expression that evaluates to true.
is_final<my_final*>::valueis an integral constant expression that evaluates to false.
is_final<T>::value_typeis the typebool.