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49 lines
1.2 KiB
C++
49 lines
1.2 KiB
C++
#pragma once
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#include <boost/operators.hpp>
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#include <iosfwd>
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template <typename Base, typename T>
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struct phantom : boost::operators<phantom<Base, T>>, boost::shiftable<phantom<Base, T>> {
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phantom() = default;
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phantom(Base y) : x(y) {}
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phantom(phantom const &) = default;
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phantom& operator=(phantom const &) = default;
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phantom(phantom &&) = default;
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phantom& operator=(phantom &&) = default;
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explicit operator Base() const { return x; }
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Base base() const { return x; }
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Base x;
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#define IMPL(op) \
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phantom & operator op (phantom rh) { \
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x op rh.x; \
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return *this; \
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}
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IMPL(+=)
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IMPL(-=)
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IMPL(*=)
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IMPL(/=)
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IMPL(%=)
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IMPL(|=)
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IMPL(&=)
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IMPL(^=)
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IMPL(<<=)
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IMPL(>>=)
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#undef IMPL
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phantom & operator++() { ++x; return *this; }
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phantom & operator--() { --x; return *this; }
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bool operator<(phantom rh) const { return x < rh.x; }
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bool operator==(phantom rh) const { return x == rh.x; }
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};
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template <typename B, typename T>
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std::ostream & operator<<(std::ostream & out, phantom<B, T> p){ return out << p.x; }
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template <typename B, typename T>
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std::istream & operator>>(std::istream & in, phantom<B, T> & p){ return in >> p.x; }
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