Difference between revisions of "cpp/container/list/push front"
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Latest revision as of 07:44, 13 November 2021
| void push_front( const T& value ); |
(1) | |
| void push_front( T&& value ); |
(2) | (since C++11) |
Prepends the given element value to the beginning of the container.
No iterators or references are invalidated.
Contents |
[edit] Parameters
| value | - | the value of the element to prepend |
[edit] Return value
(none)
[edit] Complexity
Constant.
[edit] Exceptions
If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).
[edit] Example
Run this code
#include <list> #include <iomanip> #include <iostream> #include <string> int main() { std::list<std::string> letters; letters.push_front("abc"); std::string s{"def"}; letters.push_front(std::move(s)); std::cout << "std::list letters holds: "; for (auto&& e : letters) std::cout << std::quoted(e) << ' '; std::cout << "\nMoved-from string s holds: " << std::quoted(s) << '\n'; }
Possible output:
std::list letters holds: "def" "abc" Moved-from string s holds: ""
[edit] See also
| (C++11) |
constructs an element in-place at the beginning (public member function) |
| adds an element to the end (public member function) | |
| removes the first element (public member function) | |
| creates a std::front_insert_iterator of type inferred from the argument (function template) |
