std::vector::capacity

From cppreference.com
< cpp‎ | container‎ | vector

size_type capacity() const;

Returns the number of elements that the container has currently allocated space for.

Parameters

(none)

Return value

Capacity of the currently allocated storage.

Exceptions

(none) (until C++11)
noexcept specification:  
noexcept
  
(since C++11)

Complexity

Constant.

See also

returns the number of elements
(public member function)
reserves storage
(public member function)