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Showing content from https://cplusplus.com/reference/deque/deque/operator=/ below:

public member function

<deque>

std::deque::operator= copy (1)

 deque& operator= (const deque& x);

copy (1)

deque& operator= (const deque& x);

move (2)

deque& operator= (deque&& x);

initializer list (3)

deque& operator= (initializer_list<value_type> il);

Assign content

Assigns new contents to the container, replacing its current contents, and modifying its size accordingly.

Copies all the elements from

into the container.

The container preserves its current allocator.

The

copy assignment

(1) copies all the elements from

into the container (with

preserving its contents).

The move assignment (2) moves the elements of x into the container (x is left in an unspecified but valid state).

The initializer list assignment (3) copies the elements of il into the container.

The container preserves its current allocator, except if the allocator traits indicate x's allocator should propagate. This allocator is used (through its traits) to allocate or deallocate if there are changes in storage requirements, and to construct or destroy elements, if needed.

Any elements held in the container before the call are either assigned to or destroyed.

Parameters

x: A deque object of the same type (i.e., with the same template parameters, T and Alloc).
il: An initializer_list object. The compiler will automatically construct such objects from initializer list declarators.
Member type value_type is the type of the elements in the container, defined in deque as an alias of its first template parameter (T).

Return value*this
Example

// assignment operator with deques
#include <iostream>
#include <deque>

int main ()
{
  std::deque<int> first (3);    // deque with 3 zero-initialized ints
  std::deque<int> second (5);   // deque with 5 zero-initialized ints

  second = first;
  first = std::deque<int>();

  std::cout << "Size of first: " << int (first.size()) << '\n';
  std::cout << "Size of second: " << int (second.size()) << '\n';
  return 0;
}

Output:

Size of first: 0
Size of second: 3

Complexity Linear in size.

Iterator validity All iterators, references and pointers related to this container before the call are invalidated.

In the move assignment, iterators, pointers and references referring to elements in x are also invalidated.

Data races All copied elements are accessed.
The move assignment (2) modifies x.
The container and all its elements are modified.

Exception safetyBasic guarantee: if an exception is thrown, the container is in a valid state.
If allocator_traits::construct is not supported with the appropriate arguments for the element constructions, or if value_type is not copy assignable (or move assignable for (2)), it causes undefined behavior.

See also

deque::assign: Assign container content (public member function)

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