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Showing content from https://en.cppreference.com/w/cpp/language/../algorithm/../coroutine/generator/iterator.html below:

std::generator<Ref,V,Allocator>::iterator - cppreference.com

class /*iterator*/;

(exposition only*)

The return type of generator::begin. Models indirectly_readable and input_iterator.

[edit] Member types [edit] Data members Member Description std::coroutine_handle<std::generator::promise_type> coroutine_ The coroutine handle
(exposition-only member object*) [edit] Member functions std::generator::iterator::iterator

/*iterator*/( /*iterator*/&& other ) noexcept;

(since C++23)

Initializes coroutine_ with std::exchange(other.coroutine_, {});.

std::generator::iterator::operator=

/*iterator*/& operator=( /*iterator*/&& other ) noexcept;

(since C++23)

Equivalent to coroutine_ = std::exchange(other.coroutine_, {});.

Returns: *this.

std::generator::iterator::operator*
  1. Let reference be the std::generator's underlying type.
  2. Let for some generator object x its coroutine_ be in the stack *x.active_.
  3. Let x.active_->top() refer to a suspended coroutine with promise object p.

Equivalent to return static_cast<reference>(*p.value_);.

std::generator::iterator::operator++

constexpr /*iterator*/& operator++();

(1) (since C++23)

constexpr void operator++( int );

(2) (since C++23) 1)

Let for some generator object

x

the

coroutine_

be in the stack

*x.active_

.

Equivalent to x.active_->top().resume().

Returns: *this.

2) Equivalent to ++*this;.

[edit] Non-member functions compares the underlying iterator with a sentinel
(function) operator==(std::generator::iterator)

Equivalent to return i.coroutine_.done();.

The != operator is synthesized from operator==.

This function is not visible to ordinary unqualified or qualified lookup, and can only be found by argument-dependent lookup when std::generator::iterator is an associated class of the arguments.

[edit] Example

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