std::forward_list<T,Allocator>::push_front
void push_front( const T& value ); | (1) | (since C++11) |
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
#include <forward_list>
#include <iomanip>
#include <iostream>
#include <string>
int main()
{
std::forward_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::forward_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::forward_list letters holds: "send" "me" Moved-from string s holds: ""
See also
| constructs an element in-place at the beginning (public member function) |
|
| removes the first element (public member function) |
|
creates a std::front_insert_iterator of type inferred from the argument (function template) |
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https://en.cppreference.com/cpp/container/forward_list/push_front
