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tuple relational operators

master
Daniel Kolesa 2015-07-11 22:05:02 +01:00
parent 201d2d3c86
commit fa7d07bf01
1 changed files with 71 additions and 0 deletions
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71
octa/tuple.hh
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@ -480,6 +480,77 @@ inline Tuple<T &&...> forward_as_tuple(T &&...t) {
return Tuple<T &&...>(forward<T>(t)...);
}
/* tuple relops */
namespace detail {
template<Size I>
struct TupleEqual {
template<typename T, typename U>
bool operator()(const T &x, const U &y) {
return TupleEqual<I - 1>()(x, y) && (get<I>(x) == get<I>(y));
}
};
template<>
struct TupleEqual<0> {
template<typename T, typename U>
bool operator()(const T &, const U &) {
return true;
}
};
}
template<typename ...T, typename ...U>
inline bool operator==(const Tuple<T...> &x, const Tuple<U...> &y) {
return detail::TupleEqual<sizeof...(T)>(x, y);
}
template<typename ...T, typename ...U>
inline bool operator!=(const Tuple<T...> &x, const Tuple<U...> &y) {
return !(x == y);
}
namespace detail {
template<Size I>
struct TupleLess {
template<typename T, typename U>
bool operator()(const T &x, const U &y) {
Size J = TupleSize<T>::value - I;
if (get<J>(x) < get<J>(y)) return true;
if (get<J>(y) < get<J>(x)) return false;
return TupleLess<I - 1>()(x, y);
}
};
template<>
struct TupleLess<0> {
template<typename T, typename U>
bool operator()(const T &, const U &) {
return true;
}
};
}
template<typename ...T, typename ...U>
inline bool operator<(const Tuple<T...> &x, const Tuple<U...> &y) {
return detail::TupleLess<sizeof...(T)>(x, y);
}
template<typename ...T, typename ...U>
inline bool operator>(const Tuple<T...> &x, const Tuple<U...> &y) {
return y < x;
}
template<typename ...T, typename ...U>
inline bool operator<=(const Tuple<T...> &x, const Tuple<U...> &y) {
return !(y < x);
}
template<typename ...T, typename ...U>
inline bool operator>=(const Tuple<T...> &x, const Tuple<U...> &y) {
return !(x < y);
}
} /* namespace octa */
#endif