template <class T1, class T2> constexpr bool operator==(const pair<T1, T2>& x, const pair<T1, T2>& y);
Returns: x.first == y.first && x.second == y.second.
template <class T1, class T2> constexpr bool operator<(const pair<T1, T2>& x, const pair<T1, T2>& y);
Returns: x.first < y.first || (!(y.first < x.first) && x.second < y.second).
template <class T1, class T2> constexpr bool operator!=(const pair<T1, T2>& x, const pair<T1, T2>& y);
template <class T1, class T2> constexpr bool operator>(const pair<T1, T2>& x, const pair<T1, T2>& y);
template <class T1, class T2> constexpr bool operator>=(const pair<T1, T2>& x, const pair<T1, T2>& y);
template <class T1, class T2> constexpr bool operator<=(const pair<T1, T2>& x, const pair<T1, T2>& y);
template<class T1, class T2> void swap(pair<T1, T2>& x, pair<T1, T2>& y) noexcept(noexcept(x.swap(y)));
template <class T1, class T2> constexpr pair<V1, V2> make_pair(T1&& x, T2&& y);
Returns: pair<V1, V2>(std::forward<T1>(x), std::forward<T2>(y));
where V1 and V2 are determined as follows: Let Ui be decay_t<Ti> for each Ti. Then each Vi is X& if Ui equals reference_wrapper<X>, otherwise Vi is Ui.
[ Example: In place of:
return pair<int, double>(5, 3.1415926);
a C++ program may contain:
return make_pair(5, 3.1415926);
— end example ]
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