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template<class...> struct make_void { typedef void type; }; template<class... Ts> using void_t = typename make_void<Ts...>::type;
        type: The type void
        for all T.
      
        Header:  #include
        <boost/type_traits/make_void.hpp>
        or  #include <boost/type_traits.hpp>
      
Table 1.27. Examples
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        Compiler Compatibility: All current compilers
        are supported by this trait. However, the type alias void_t
        is only available if the compiler supports template aliases. Further, in
        the absence of variadic-template support, make_void
        only supports up to 5 parameters.