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

From cppreference.com
 
 
 
 
friend constexpr bool operator==( const /*iterator*/& x, const /*iterator*/& y )
  requires std::equality_comparable<ranges::iterator_t<Base>>;
(1) (since C++20)
friend constexpr bool operator<( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base>;
(2) (since C++20)
friend constexpr bool operator>( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base>;
(3) (since C++20)
friend constexpr bool operator<=( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base>;
(4) (since C++20)
friend constexpr bool operator>=( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base>;
(5) (since C++20)
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++20)

Compares the underlying iterators.

1) Equivalent to return x.current_ == y.current_;, where current_ is the underlying iterator.
2) Equivalent to return x.current_ < y.current_;, where current_ is the underlying iterator.
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_;, where current_ is the underlying iterator.

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

The != operator is synthesized from operator==.

[edit] Parameters

x, y - iterators to compare

[edit] Return value

result of comparison