C Vector Library

The c standard library vector class is a class template for sequence containers. C vectors are sequence containers that store elements. Just like arrays vectors use contiguous storage locations for their elements which means that their elements can also be accessed using offsets on regular pointers to its elements and just as efficiently as in arrays.
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A vector stores elements of a given type in a linear arrangement and allows fast random access to any element.

C vector library. Sequence containers store elements strictly in linear sequence. C vector library vector function the c fill constructor stdvectorvector constructs a container of size n and assigns value valif provided to each element of the container. Vector vectors are sequence containers representing arrays that can change in size. Vector elements are placed in contiguous storage so that they can be accessed and traversed using iterators.

If vector object is constant qualified then method returns constant reference otherwise it returns non constant reference. Vector in c stl vectors are same as dynamic arrays with the ability to resize itself automatically when an element is inserted or deleted with their storage being handled automatically by the container. Specifically used to work with dynamic data c vectors may expand depending on the elements they contain. Container is a objects that hold data of same type.

A vector is the preferred container for a sequence when random access performance is at a premium. Returns an element from specified location if n is valid vector index. Vector is a template class in stl standard template library of c programming language. That makes it different from a fixed size array.

Reallocation happens if there is need of more space. The following example shows the usage of stdvectorreserve function. Vector stores elements in contiguous memory locations and enables direct access to any element using subscript operator. The c function stdvectorreserve requests to reserve vector capacity be at least enough to contain n elements.

The c function stdvectorat returns reference to the element present at location n in the vector. In below example initial size of vector v1 is zero. Vectors are sequence container that can change size.