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

 

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std::list

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list::list

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list::front

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list::beginlist::cbegin (C++11)

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list::emplace_back (C++11)

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std::swap

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operator==operator!=operator<operator>operator<=operator>=operator<=> (until C++20)(until C++20)(until C++20)(until C++20)(until C++20)(C++20)

Deduction guides(C++17)

 

void push_front( const T& value );
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 <list>
#include <iostream>
#include <iomanip>
#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 (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)