half_nonnegative.hpp

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#ifndef ALGO_HALF_NONNEGATIVE_H
#define ALGO_HALF_NONNEGATIVE_H
 
#include <type_traits>
#include <utility>
 
namespace algo {
 
    template <typename N> auto half_nonnegative(N n) noexcept ->
        typename std::enable_if_t<std::is_integral<N>::value, N> {
        using UN = typename std::make_unsigned_t<N>;
        return static_cast<N>(static_cast<UN>(n) / 2);
    }
 
    template <typename N> auto half_nonnegative(N n) noexcept ->
        typename std::enable_if_t<!std::is_integral<N>::value, N> {
        return std::move(n) / 2;
    }
 
}  // namespace algo
 
#endif  // ALGO_HALF_NONNEGATIVE_H