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) |
|
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
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>
.
[edit] Specializations
Custom specializations of std::rbegin
may be provided for classes that do not expose a suitable rbegin()
member function, yet can be iterated. The following specialization is already provided by the standard library:
(C++14)
|
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)
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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)
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returns a reverse end iterator for a container or array (function) |