Difference between revisions of "cpp/iterator/rend"
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| code= | | code= | ||
| + | #include <iostream> | ||
| + | #include <vector> | ||
| + | #include <iterator> | ||
| + | #include <algorithm> | ||
| + | |||
| + | int main() | ||
| + | { | ||
| + | std::vector<int> v = {4, 6, -3, 9, 10}; | ||
| + | |||
| + | std::cout << "Array forwards: "; | ||
| + | std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " ")); | ||
| + | |||
| + | std::cout << '\n'; | ||
| + | |||
| + | std::cout << "Array backwards: "; | ||
| + | std::copy(v.rbegin(), v.rend(), std::ostream_iterator<int>(std::cout, " ")); | ||
| + | |||
| + | return 0; | ||
| + | } | ||
| output= | | output= | ||
| + | Array forwards: 4 6 -3 9 10 | ||
| + | Array backwards: 10 9 -3 6 4 | ||
}} | }} | ||
Revision as of 04:50, 10 May 2014
| Defined in header <iterator>
|
||
| template< class C > auto rend( C& c ) -> decltype(c.rend()); |
(1) | (since C++14) |
| template< class C > auto rend( const C& c ) -> decltype(c.rend()); |
(1) | (since C++14) |
| template< class T, size_t N > reverse_iterator<T*> rend( T (&array)[N] ); |
(2) | (since C++14) |
| template< class C > auto crend( const C& c ) -> decltype(std::rend(c)); |
(3) | (since C++14) |
Returns an iterator to the reverse-end of the given container c or array array.
1) Returns a possibly const-qualified iterator to the reverse-end of the container
c.3) Returns a const-qualified iterator to the reverse-end of the container
c.
Contents |
Parameters
| c | - | a container with a rend method
|
| array | - | an array of arbitrary type |
Return value
An iterator to the reverse-end of c or array
Notes
In addition to being included in <iterator>, std::rend is guaranteed to become available if any of the following headers are included: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <unordered_map>, <unordered_set>, and <vector>.
Specializations
Custom specializations of std::rend may be provided for classes that do not expose a suitable rend() member function, yet can be iterated. The following specializations are already provided by the standard library:
| (C++14) |
specializes std::rend (function) |
Example
Run this code
#include <iostream> #include <vector> #include <iterator> #include <algorithm> int main() { std::vector<int> v = {4, 6, -3, 9, 10}; std::cout << "Array forwards: "; std::copy(v.begin(), v.end(), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; std::cout << "Array backwards: "; std::copy(v.rbegin(), v.rend(), std::ostream_iterator<int>(std::cout, " ")); return 0; }
Output:
Array forwards: 4 6 -3 9 10 Array backwards: 10 9 -3 6 4
See also
| (C++11)(C++14) |
returns an iterator to the end of a container or array (function template) |
| (C++14) |
returns a reverse iterator to the beginning of a container or array (function template) |
| (C++11)(C++14) |
returns an iterator to the beginning of a container or array (function template) |
