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template <class T>
struct floating_point_promotion
{
   typedef see-below type;
};
template <class T> using floating_point_promotion_t = typename floating_point_promotion<T>::type; // C++11 and above
        type: If floating point promotion can be
        applied to an rvalue of type T,
        then applies floating point promotion to T
        and keeps cv-qualifiers of T,
        otherwise leaves T unchanged.
      
C++ Standard Reference: 4.6.
        Header:  #include
        <boost/type_traits/floating_point_promotion.hpp>
        or  #include <boost/type_traits.hpp>
      
Table 1.21. Examples
| Expression | Result Type | 
|---|---|
| 
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| 
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| 
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Compiler Compatibility: All current compilers are supported by this trait.