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/C++

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

Return value

(none).

Complexity

Constant.

Exceptions

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

Example

#include <forward_list>
#include <iomanip>
#include <iostream>
#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: ""