std::vector::reserve

 

C++

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void reserve( size_type size );

Sets the capacity of the container to at least size. New storage is allocated if necessary.

If size() is greater than capacity(), all iterators and references, including the past-the-end iterator, are invalidated. Otherwise, no iterators or references are invalidated.

Parameters

size

-

new capacity of the container

Return value

(none)

Exceptions

std::length_error if size > max_size().

Complexity

Linear in the size of the container

See also

capacity	returns the number of elements that can be held in currently allocated storage (public member function)