std::common_iterator is an iterator I / sentinel S adaptor that may represent a non-common range (where the types of I and S differ) as a common_range, by containing either an iterator or a sentinel, and defining the appropriate equality comparison operators operator==.
std::common_iterator can be used as a "bridge" between sequences represented by iterator/sentinel pair and legacy functions that expect common_range-like sequences.
var an object of type std::variant<I, S>
#include <algorithm>
#include <iostream>
#include <iterator>
#include <list>
#include <string>
template<class ForwardIter>
void fire(ForwardIter first, ForwardIter last)
{
std::copy(first, last, std::ostream_iterator<std::string>{std::cout, " "});
}
int main()
{
std::list<std::string> stars{"Pollux", "Arcturus", "Mira", "Aldebaran", "Sun"};
using IT = std::common_iterator<
std::counted_iterator<std::list<std::string>::iterator>,
std::default_sentinel_t>;
fire(IT(std::counted_iterator(stars.begin(), stars.size() - 1)),
IT(std::default_sentinel));
}
Output:
Pollux Arcturus Mira Aldebaran[edit] References
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