concept bool OutputIterator =
Iterator<I> && Writable<I, T> &&
requires(I i, T&& t) {
*i++ = std::forward<T>(t); // not required to be equality preserving
The OutputIterator
concept is a refinement of Iterator
, adding the requirement that it can be used to write values of values of type and value category encoded by T
(via Writable
). EqualityComparable
is not required.
Let E
be an expression such that decltype((E)) is T
, and i
be a dereferenceable object of type I
. OutputIterator<I, T>
is satisfied only if *i++ = E; has effects equivalent to *i = E; ++i;.
An expression is equality preserving if it results in equal outputs given equal inputs.
Every expression required to be equality preserving is further required to be stable: two evaluations of such an expression with the same input objects must have equal outputs absent any explicit intervening modification of those input objects.
[edit] NotesUnlike the output iterator requirements in the C++ standard, OutputIterator
in the Ranges TS does not require that the iterator category tag be defined.
Algorithms on output iterators should be single pass.
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