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operator==,<,>,<=,>=,<=>(ranges::zip_view::iterator)

friend constexpr bool operator==( const /*iterator*/& x, const /*iterator*/& y )
  requires (std::equality_comparable<
    ranges::iterator_t</*maybe-const*/<Const, Views>>> && ...);
 (1) (since C++23) 
friend constexpr bool operator<( const /*iterator*/& x, const /*iterator*/& y )
  requires /*all-random-access*/<Const, Views...>;
 (2) (since C++23) 
friend constexpr bool operator>( const /*iterator*/& x, const /*iterator*/& y )
  requires /*all-random-access*/<Const, Views...>;
 (3) (since C++23) 
friend constexpr bool operator<=( const /*iterator*/& x, const /*iterator*/& y )
  requires /*all-random-access*/<Const, Views...>;
 (4) (since C++23) 
friend constexpr bool operator>=( const /*iterator*/& x, const /*iterator*/& y )
  requires /*all-random-access*/<Const, Views...>;
 (5) (since C++23) 
friend constexpr auto operator<=>( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base> &&
           std::three_way_comparable<ranges::iterator_t<Base>>;
 (6) (since C++23)

Compares the underlying iterators.

Let current_ be the underlying tuple-like object of iterators to elements of adapted views.

1) Returns:
  • x.current_ == y.current_ if /*all-bidirectional*/<Const, Views...> is true.
  • Otherwise, true if there exists an integer 0 <= i < sizeof...(Views) such that bool(std::get<i>(x.current_) == std::get<i>(y.current_)) is true.
  • Otherwise, false.
2) Equivalent to return x.current_ < y.current_;.
3) Equivalent to return y < x;
4) Equivalent to return !(y < x);
5) Equivalent to return !(x < y);
6) Equivalent to return x.current_ <=> y.current_;.

These functions are not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::ranges::zip_view::iterator<Const> is an associated class of the arguments.

The != operator is synthesized from operator==.

Parameters

x, y - iterators to compare

Return value

The result of comparison.

Notes

zip_view models common_range if all adapted views vs_... model common_range.

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https://en.cppreference.com/w/cpp/ranges/zip_view/iterator/operator_cmp