std::rend, std::crend - cppreference.com
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(1) | (since C++14) (constexpr since C++17) |
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(2) | (since C++14) (constexpr since C++17) |
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(3) | (since C++14) (constexpr since C++17) |
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(4) | (since C++14) (constexpr since C++17) |
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(5) | (since C++14) (constexpr since C++17) |
Returns an iterator to the reverse-end of the given range.
1,2) Returns c.rend(), which is typically an iterator one past the reverse-end of the sequence represented by c.
1) If C is a standard Container, returns a C::reverse_iterator object.
2) If C is a standard Container, returns a C::const_reverse_iterator object.
3) Returns an std::reverse_iterator<T*> object to the reverse-end of array.
4) Returns an std::reverse_iterator<const T*> object to the reverse-end of il.
5) Returns std::end(c), with c always treated as const-qualified.
If C is a standard Container, returns a C::const_reverse_iterator object.
Parameters
| c | - | a container or view with a rend member function
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| array | - | an array of arbitrary type |
| il | - | an std::initializer_list
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Return value
1,2) c.rend()
3) std::reverse_iterator<T*>(array)
4) std::reverse_iterator<const T*>(il.begin())
5) c.rend()
Exceptions
May throw implementation-defined exceptions.
Overloads
Custom overloads of rend may be provided for classes and enumerations that do not expose a suitable rend() member function, yet can be iterated.
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Overloads of |
(since C++20) |
Notes
The overload for std::initializer_list is necessary because it does not have a member function rend.
Example
#include <algorithm> #include <iostream> #include <iterator> #include <vector> int main() { int a[]{4, 6, -3, 9, 10}; std::cout << "C-style array `a` backwards: "; std::copy(std::rbegin(a), std::rend(a), std::ostream_iterator<int>(std::cout, " ")); auto il = {3, 1, 4}; std::cout << "\nstd::initializer_list `il` backwards: "; std::copy(std::rbegin(il), std::rend(il), std::ostream_iterator<int>(std::cout, " ")); std::vector<int> v{4, 6, -3, 9, 10}; std::cout << "\nstd::vector `v` backwards: "; std::copy(std::rbegin(v), std::rend(v), std::ostream_iterator<int>(std::cout, " ")); std::cout << '\n'; }
Output:
C-style array `a` backwards: 10 9 -3 6 4 std::initializer_list `il` backwards: 4 1 3 std::vector `v` backwards: 10 9 -3 6 4
See also
| returns an iterator to the end of a container or array (function template) [edit] | |
| returns a reverse iterator to the beginning of a container or array (function template) [edit] | |
| returns an iterator to the beginning of a container or array (function template) [edit] | |
| returns a reverse end iterator to a range (customization point object)[edit] | |
| returns a reverse end iterator to a read-only range (customization point object)[edit] |