NAME¶

std::forward_list::push_front - std::forward_list::push_front

Synopsis¶

void push_front( const T& value ); (since C++11)
void push_front( T&& value ); (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

Return value¶

(none)

Complexity¶

Constant.

Exceptions¶

If an exception is thrown, this function has no effect (strong exception guarantee).

Example¶

// Run this code

#include <forward_list>
#include <iostream>
#include <iomanip>
#include <string>

int main()
{
std::forward_list<std::string> letters;

letters.push_front("abc");
std::string s{"def"};
letters.push_front(std::move(s));

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: "def" "abc"
Moved-from string `s` holds: ""

See also¶

emplace_front constructs an element in-place at the beginning
(C++11) (public member function)
pop_front removes the first element
(C++11) (public member function)
creates a std::front_insert_iterator of type inferred from the
front_inserter argument
(function template)