Difference between revisions of "Template:cpp/container/back"
From cppreference.com
(Use equivalent expression without temporary.) |
m (→Notes: a return statement is not an expression) |
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===Notes=== | ===Notes=== | ||
| − | For a non-empty container {{tt|c}}, the expression {{c| | + | For a non-empty container {{tt|c}}, the expression {{c|c.back()}} is equivalent to {{c|*std::prev(c.end())}} |
===Example=== | ===Example=== | ||
Revision as of 08:44, 18 April 2020
| reference back(); |
(since {std}) | |
| const_reference back() const; |
(since {std}) | |
Returns reference to the last element in the container.
Calling back on an empty container causes undefined behavior.
Contents |
Parameters
(none)
Return value
Reference to the last element.
Complexity
Constant.
Notes
For a non-empty container c, the expression c.back() is equivalent to *std::prev(c.end())
Example
The following code uses back to display the last element of a std::{{{1}}}<char>:
Run this code
#include <{{{1}}}> #include <iostream> int main() { std::{{{1}}}<char> letters {'a', 'b', 'c', 'd', 'e', 'f'}; if (!letters.empty()) { std::cout << "The last character is: " << letters.back() << '\n'; } }
Output:
The last character is f
See also
| access the first element (public member function of std::{{{1}}})
|
