std::list<T,Allocator>::push_front
From cppreference.com
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.
Parameters
| value | - | the value of the element to prepend |
Complexity
Constant.
Exceptions
If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).
Example
Run this code
#include <list>
#include <iomanip>
#include <iostream>
#include <string>
int main()
{
std::list<std::string> letters;
letters.push_front("me"); // overload (1)
std::string s{"send"};
letters.push_front(std::move(s)); // overload (2)
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: "send" "me"
Moved-from string s holds: ""
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) |