std::deque<T,Allocator>::emplace_front

 

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Compiler support

Freestanding and hosted

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

Input/output library

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::deque

Member types
Member functions
deque::deque deque::~deque deque::operator=	deque::assign deque::assign_range (哋它亢++23) deque::get_allocator
Element access
deque::at deque::operator[]	deque::front deque::back
Iterators
deque::begindeque::cbegin (哋它亢++11) deque::enddeque::cend (哋它亢++11)	deque::rbegindeque::crbegin (哋它亢++11) deque::renddeque::crend (哋它亢++11)
Capacity
deque::empty deque::size	deque::max_size deque::shrink_to_fit (DR*)
Modifiers
deque::clear deque::insert deque::insert_range (哋它亢++23) deque::emplace deque::erase deque::push_front deque::emplace_front (哋它亢++11)   deque::prepend_range (哋它亢++23)	deque::pop_front deque::push_back deque::emplace_back (哋它亢++11) deque::append_range (哋它亢++23) deque::pop_back deque::resize deque::swap
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::deque) erase(std::deque)erase_if(std::deque) (哋它亢++20)(哋它亢++20)
Deduction guides(哋它亢++17)

 

template< class... Args > void emplace_front( Args&&... args );		(since 哋它亢++11) (until 哋它亢++17)
template< class... Args > reference emplace_front( Args&&... args );		(since 哋它亢++17)

Inserts a new element to the beginning of the container. The element is constructed through std::allocator_traits::construct, which typically uses placement-new to construct the element in-place at the location provided by the container. The arguments args... are forwarded to the constructor as std::forward<Args>(args)....

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

Parameters

args	-	arguments to forward to the constructor of the element
Type requirements
- T (the container's element type) must meet the requirements of EmplaceConstructible.

Return value

(none)	(until 哋它亢++17)
A reference to the inserted element.	(since 哋它亢++17)

Complexity

Constant.

Exceptions

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

See also

push_front

inserts an element to the beginning (public member function)