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std::make_reverse_iterator

Defined in header `<iterator>`
template <class Iter> std::reverse_iterator<Iter> make_reverse_iterator( Iter i );		(since C++14) (until C++17)
template <class Iter> constexpr std::reverse_iterator<Iter> make_reverse_iterator( Iter i );		(since C++17)

make_reverse_iterator is a convenience function template that constructs a std::reverse_iterator for the given iterator i (which must be a LegacyBidirectionalIterator) with the type deduced from the type of the argument.

Parameters

iterator to be converted to reverse iterator

Return value

A std::reverse_iterator constructed from i.

Notes

Feature-test macro
`__cpp_lib_make_reverse_iterator`

Possible implementation

template< class Iter >
constexpr std::reverse_iterator<Iter> make_reverse_iterator( Iter i )
{
    return std::reverse_iterator<Iter>(i);
}

Example

#include <iostream>
#include <iterator>
#include <vector>
#include <algorithm>
 
int main() {
    std::vector<int> v{ 1, 3, 10, 8, 22 };
 
    std::sort(v.begin(), v.end());
    std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, ", "));
 
    std::cout << '\n';
 
    std::copy(
        std::make_reverse_iterator(v.end()), 
        std::make_reverse_iterator(v.begin()),
        std::ostream_iterator<int>(std::cout, ", "));
}

Output:

1, 3, 8, 10, 22, 
22, 10, 8, 3, 1,