std::list<T,Allocator>::push_front

 

C++

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std::list

Member functions
list::list list::~list list::operator= list::assign list::assign_range (C++23)   list::get_allocator Element access list::front list::back Iterators list::beginlist::cbegin (C++11) list::endlist::cend (C++11) list::rbeginlist::crbegin (C++11) list::rendlist::crend (C++11) Capacity list::size list::empty list::max_size	Modifiers list::clear list::insert list::insert_range (C++23) list::emplace (C++11) list::erase list::push_front list::emplace_front (C++11) list::prepend_range (C++23) list::pop_front list::push_back list::emplace_back (C++11) list::append_range (C++23) list::pop_back list::resize list::swap Operations list::merge list::splice list::removelist::remove_if list::reverse list::unique list::sort
Non-member functions
operator==operator<=> (C++20) swap(std::list) erase(std::list)erase_if(std::list) (C++20)(C++20)	operator!=operator<operator>operator<=operator>= (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)
Deduction guides(C++17)

 

void push_front( const T& value );	(1)	(constexpr since C++26)
void push_front( T&& value );	(2)	(since C++11) (constexpr since C++26)

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

No iterators or references are invalidated.

Parameters

value	-	the value of the element to prepend
Type requirements
- If the following condition is satisfied, the behavior is undefined: 1) T is not CopyInsertable into list. 2) T is not MoveInsertable into list. (since C++11)

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

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

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