Difference between revisions of "cpp/container/vector/back"
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Latest revision as of 12:44, 4 December 2020
| reference back(); |
(1) | (constexpr since C++20) |
| const_reference back() const; |
(2) | (constexpr since C++20) |
Returns a reference to the last element in the container.
Calling back on an empty container causes undefined behavior.
Contents |
[edit] Parameters
(none)
[edit] Return value
Reference to the last element.
[edit] Complexity
Constant.
[edit] Notes
For a non-empty container c, the expression c.back() is equivalent to *std::prev(c.end()).
[edit] Example
Run this code
#include <cassert> #include <vector> int main() { std::vector<char> letters{'a', 'b', 'c', 'd'}; assert(letters.back() == 'd'); }
[edit] See also
| access the first element (public member function) | |
| (C++11) |
returns a reverse iterator to the beginning (public member function) |
| (C++11) |
returns an iterator to the end (public member function) |
