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template<class T, class U>
struct copy_cv_ref
{
    typedef see-below type;
};
template<class T, class U>
using copy_cv_ref_t = typename copy_cv_ref<T, U>::type;
        type: T cvref,
        where cvref are the cvref-qualifiers of U.
      
        Header: #include
        <boost/type_traits/copy_cv_ref.hpp>
        or #include <boost/type_traits.hpp>>
      
Table 1.18. Examples
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        Compiler Compatibility: All current compilers
        are supported by this trait. The type alias copy_cv_ref_t
        is only available if the compiler supports template aliases.