45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
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#ifndef BIT_NUMBER_HPP_H3ODBQR7
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#define BIT_NUMBER_HPP_H3ODBQR7
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#include <boost/operators.hpp>
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#include <cstddef>
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#include <type_traits>
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namespace vanetza {
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/**
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* BitNumber restricts the value range by the given width
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*
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* \tparam T underlying integral type
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* \tparam WIDTH number of bits used to represent a number
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*/
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template<typename T, std::size_t WIDTH>
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class BitNumber : public boost::totally_ordered<BitNumber<T, WIDTH>>
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{
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static_assert(std::is_integral<T>::value == true,
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"only integral types are supported");
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static_assert(sizeof(T) * 8 > WIDTH,
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"width has to be less than size of underlying type");
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public:
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static constexpr T mask = (1 << WIDTH) - 1; /**< excessive bits are masked */
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static constexpr std::size_t bits = WIDTH; /**< number of bits used */
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typedef T value_type; /**< underlying (integral) value type */
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BitNumber() : mValue(0) {}
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BitNumber(T value) : mValue(value & mask) {}
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BitNumber& operator=(T value) { mValue = value & mask; return *this; }
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T raw() const { return mValue; }
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bool operator<(BitNumber other) const { return mValue < other.mValue; }
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bool operator==(BitNumber other) const { return mValue == other.mValue; }
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private:
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T mValue;
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};
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} // namespace vanetza
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#endif /* BIT_NUMBER_HPP_H3ODBQR7 */
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