< cpp‎ | ranges‎ | zip view‎ | iterator
Ranges library
Range access
Range conversions

Range primitives

Dangling iterator handling
Range concepts

Range factories
Range adaptors
Range generators
Range adaptor objects
Range adaptor closure objects
Helper items
(until C++23)(C++23)

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 auto operator<=>( const /*iterator*/& x, const /*iterator*/& y )
  requires ranges::random_access_range<Base>;
(2) (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_;.

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 <, <=, >, >=, and != operators are synthesized from operator<=> and operator== respectively.

[edit] Parameters

x, y - iterators to compare

[edit] Return value

The result of comparison

[edit] See also

compares a sentinel with an iterator returned from zip_view::begin
(function) [edit]