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Showing content from https://timsong-cpp.github.io/cppwp/n4140/deque.capacity below:

[deque.capacity]

void resize(size_type sz);

Effects: If sz <= size(), equivalent to calling pop_back() size() - sz times. If size() < sz, appends sz - size() default-inserted elements to the sequence.

Requires: T shall be MoveInsertable and DefaultInsertable into *this.

void resize(size_type sz, const T& c);

Effects: If sz <= size(), equivalent to calling pop_back() size() - sz times. If size() < sz, appends sz - size() copies of c to the sequence.

Requires: T shall be CopyInsertable into *this.

void shrink_to_fit();

Requires: T shall be MoveInsertable into *this.

Complexity: Linear in the size of the sequence.

Remarks: shrink_to_fit is a non-binding request to reduce memory use but does not change the size of the sequence. [ Note: The request is non-binding to allow latitude for implementation-specific optimizations.  — end note ]

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