std::rbegin, std::crbegin
From cppreference.com
| Defined in header <iterator>
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| (1) | ||
| template< class C > auto rbegin( C& c ) -> decltype(c.rbegin()); |
(since C++14) (until C++17) |
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| template< class C > constexpr auto rbegin( C& c ) -> decltype(c.rbegin()); |
(since C++17) | |
| (1) | ||
| template< class C > auto rbegin( const C& c ) -> decltype(c.rbegin()); |
(since C++14) (until C++17) |
|
| template< class C > constexpr auto rbegin( const C& c ) -> decltype(c.rbegin()); |
(since C++17) | |
| (2) | ||
| template< class T, size_t N > reverse_iterator<T*> rbegin( T (&array)[N] ); |
(since C++14) (until C++17) |
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| template< class T, size_t N > constexpr reverse_iterator<T*> rbegin( T (&array)[N] ); |
(since C++17) | |
| (3) | ||
| template< class C > auto crbegin( const C& c ) -> decltype(std::rbegin(c)); |
(since C++14) (until C++17) |
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| template< class C > constexpr auto crbegin( const C& c ) -> decltype(std::rbegin(c)); |
(since C++17) | |
Returns an iterator to the reverse-beginning of the given container c or array array.
1) Returns a possibly const-qualified iterator to the reverse-beginning of the container
c.3) Returns a const-qualified iterator to the reverse-beginning of the container
c.
Contents |
[edit] Parameters
| c | - | a container with a rbegin method
|
| array | - | an array of arbitrary type |
[edit] Return value
An iterator to the reverse-beginning of c or array
[edit] Notes
In addition to being included in <iterator>, std::rbegin and std::crbegin are guaranteed to become available if any of the following headers are included: <array>, <deque>, <forward_list>, <list>, <map>, <regex>, <set>, <string>, <string_view> (since C++17), <unordered_map>, <unordered_set>, and <vector>.
[edit] Overloads
Custom overloads of rbegin may be provided for classes that do not expose a suitable rbegin() member function, yet can be iterated. The following overload is already provided by the standard library:
| specializes std::rbegin (function) |
[edit] Example
Run this code
#include <iostream> #include <vector> #include <iterator> int main() { std::vector<int> v = { 3, 1, 4 }; auto vi = std::rbegin(v); std::cout << *vi << '\n'; int a[] = { -5, 10, 15 }; auto ai = std::rbegin(a); std::cout << *ai << '\n'; }
Output:
4 15
[edit] See also
| (C++11)(C++14) |
returns an iterator to the beginning of a container or array (function) |
| (C++11)(C++14) |
returns an iterator to the end of a container or array (function) |
| (C++14) |
returns a reverse end iterator for a container or array (function) |