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std::operator ==,!=,<,<=,>,>= (std::span)

template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator==(std::span<T, X> l, std::span<U, Y> r);	(1)
template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator!=(std::span<T, X> l, std::span<U, Y> r);	(2)
template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator<(std::span<T, X> l, std::span<U, Y> r);	(3)
template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator<=(std::span<T, X> l, std::span<U, Y> r);	(4)
template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator>(std::span<T, X> l, std::span<U, Y> r);	(5)
template <class T, std::ptrdiff_t X, class U, std::ptrdiff_t Y> constexpr bool operator>=(std::span<T, X> l, std::span<U, Y> r);	(6)

Lexicographically compare the contents of two spans.

1) Equivalent to return std::equal(l.begin(), l.end(), r.begin(), r.end());.

2) Equivalent to return !(l == r);.

3) Equivalent to return std::lexicographical_compare(l.begin(), l.end(), r.begin(), r.end());.

4) Equivalent to return !(r < l);.

5) Equivalent to return (r < l);.

6) Equivalent to return !(l < r);.

l, r

spans to compare

The result of the comparison.

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