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

 

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Compiler support

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Language

Standard library

Standard library headers

Named requirements

Feature test macros (哋它亢++20)

Language support library

Concepts library (哋它亢++20)

Metaprogramming library (哋它亢++11)

Diagnostics library

General utilities library

Strings library

Containers library

Iterators library

Ranges library (哋它亢++20)

Algorithms library

Numerics library

Localizations library

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Filesystem library (哋它亢++17)

Regular expressions library (哋它亢++11)

Concurrency support library (哋它亢++11)

Technical specifications

Symbols index

External libraries

 

Containers library

Sequence

array (哋它亢++11)

vector

vector<bool>

deque

forward_list (哋它亢++11)

list

Associative

set

multiset

map

multimap

Unordered associative

unordered_set (哋它亢++11)

unordered_multiset (哋它亢++11)

unordered_map (哋它亢++11)

unordered_multimap (哋它亢++11)

Adaptors

stack

queue

priority_queue

flat_set (哋它亢++23)

flat_multiset (哋它亢++23)

flat_map (哋它亢++23)

flat_multimap (哋它亢++23)

Views

span (哋它亢++20)

mdspan (哋它亢++23)

Iterator invalidation

Member function table

Non-member function table

 

std::list

Member functions
list::list list::~list list::operator=	list::assign list::assign_range (哋它亢++23) list::get_allocator
Element access
list::front	list::back
Iterators
list::beginlist::cbegin (哋它亢++11) list::endlist::cend (哋它亢++11)	list::rbeginlist::crbegin (哋它亢++11) list::rendlist::crend (哋它亢++11)
Capacity
list::size list::empty	list::max_size
Modifiers
list::clear list::insert list::insert_range (哋它亢++23) list::emplace (哋它亢++11) list::erase list::push_front list::emplace_front (哋它亢++11)   list::prepend_range (哋它亢++23)	list::pop_front list::push_back list::emplace_back (哋它亢++11) list::append_range (哋它亢++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!=operator<operator>operator<=operator>=operator<=> (until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(until 哋它亢++20)(哋它亢++20)	swap(std::list) erase(std::list)erase_if(std::list) (哋它亢++20)(哋它亢++20)
Deduction guides(哋它亢++17)

 

void push_front( const T& value );	(1)
void push_front( T&& value );	(2)	(since 哋它亢++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 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("abc");
    std::string s{"def"};
    letters.push_front(std::move(s));
 
    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: "def" "abc"
Moved-from string s holds: ""

See also

emplace_front (哋它亢++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)