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template <class T>
struct integral_promotion
{
   typedef see-below type;
};
template <class T> using integral_promotion_t = typename integral_promotion<T>::type; // C++11 and above
        type: If integral promotion can be applied
        to an rvalue of type T, then
        applies integral promotion to T
        and keeps cv-qualifiers of T,
        otherwise leaves T unchanged.
      
C++ Standard Reference: 4.5 except 4.5/3 (integral bit-field).
        Header:  #include
        <boost/type_traits/integral_promotion.hpp>
        or  #include <boost/type_traits.hpp>
      
Table 1.24. Examples
| Expression | Result Type | 
|---|---|
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