std::output_iterator

Since C++20

Header: <iterator>

The output_iterator concept is a refinement of input_or_output_iterator, adding the requirement that it can be used to write values of type and value category encoded by T (via indirectly_writable). equality_comparable is not required.

# Declarations

template< class I, class T >
concept output_iterator =
std::input_or_output_iterator<I> &&
std::indirectly_writable<I, T> &&
requires(I i, T&& t) {
*i++ = std::forward<T>(t); /* not required to be equality-preserving */
};

(since C++20)

# Notes

Unlike the LegacyOutputIterator requirements, the output_iterator concept does not require that the iterator category tag be defined.

Algorithms on output iterators should be single pass.

# See also