[deque.modifiers]

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iterator insert(const_iterator position, const T& x);
iterator insert(const_iterator position, T&& x);
iterator insert(const_iterator position, size_type n, const T& x);
template<class InputIterator>
  iterator insert(const_iterator position,
                  InputIterator first, InputIterator last);
iterator insert(const_iterator position, initializer_list<T>);

template<class... Args> reference emplace_front(Args&&... args);
template<class... Args> reference emplace_back(Args&&... args);
template<class... Args> iterator emplace(const_iterator position, Args&&... args);
void push_front(const T& x);
void push_front(T&& x);
void push_back(const T& x);
void push_back(T&& x);

Effects: An insertion in the middle of the deque invalidates all the iterators and references to elements of the deque.

An insertion at either end of the deque invalidates all the iterators to the deque, but has no effect on the validity of references to elements of the deque.

Remarks: If an exception is thrown other than by the copy constructor, move constructor, assignment operator, or move assignment operator of T there are no effects.

If an exception is thrown while inserting a single element at either end, there are no effects.

Otherwise, if an exception is thrown by the move constructor of a non-Cpp17CopyInsertable T, the effects are unspecified.

Complexity: The complexity is linear in the number of elements inserted plus the lesser of the distances to the beginning and end of the deque.

Inserting a single element at either the beginning or end of a deque always takes constant time and causes a single call to a constructor of T.

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iterator erase(const_iterator position);
iterator erase(const_iterator first, const_iterator last);
void pop_front();
void pop_back();

Effects: An erase operation that erases the last element of a deque invalidates only the past-the-end iterator and all iterators and references to the erased elements.

An erase operation that erases the first element of a deque but not the last element invalidates only iterators and references to the erased elements.

An erase operation that erases neither the first element nor the last element of a deque invalidates the past-the-end iterator and all iterators and references to all the elements of the deque.

[Note

pop_front and pop_back are erase operations.

— end note

]

Complexity: The number of calls to the destructor of T is the same as the number of elements erased, but the number of calls to the assignment operator of T is no more than the lesser of the number of elements before the erased elements and the number of elements after the erased elements.

22 Containers library [containers]

22.3 Sequence containers [sequences]

22.3.8 Class template deque [deque]

22.3.8.4 Modifiers [deque.modifiers]