SignExtend.hpp

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#include <type_traits>

namespace duds { namespace general {

template <unsigned B, typename T>
inline typename std::make_signed<T>::type SignExtend(const T x) {
    struct {
        typename std::make_signed<T>::type x:B;
    } s;
    return s.x = (typename std::make_signed<T>::type)x;
}

} }