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# std::deque::shrink_to_fit

From cppreference.com
< cpp‎ | container‎ | deque

[edit template]

void shrink_to_fit(); |  | (since C++11)

Requests the removal of unused capacity.

It is a non-binding request to reduce `capacity` to size(). It depends on the implementation if the request is fulfilled.

All iterators and references are potentially invalidated. Past-the-end iterator is also potentially invalidated.

### [edit] Parameters

(none)

Type requirements
- `T` must meet the requirements of `MoveInsertable`.

### [edit] Return value

(none)

### [edit] Complexity

At most linear in the size of the container.

### [edit] Example

[edit]
Run this code

    #include <deque>

    int main() {
        std::deque<int> nums(1000, 42);
        nums.push_front(1);
        nums.pop_front();

        nums.clear();

        // nums now contains no items, but it may still be holding allocated memory.
        // Calling shrink_to_fit will free any unused memory.
        nums.shrink_to_fit();
    }

### [edit] See also

size | returns the number of elements (public member function) [edit]

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