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Showing content from https://en.cppreference.com/w/cpp/language/../container/deque/push_front.html below:

std::deque<T,Allocator>::push_front - cppreference.com

void push_front( const T& value );

void push_front( T&& value );

Prepends a copy of value to the beginning of the container.

All iterators (including the end() iterator) are invalidated. No references are invalidated.

Constant.

If an exception is thrown for any reason, these functions have no effect (strong exception safety guarantee).

#include <deque>
#include <iomanip>
#include <iostream>
#include <string>
 
int main()
{
    std::deque<std::string> letters;
 
    letters.push_front("me"); // overload (1)
    std::string s{"send"};
    letters.push_front(std::move(s)); // overload (2)
 
    std::cout << "std::deque 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::deque letters holds: "send" "me"
Moved-from string s holds: ""

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