Vector class in C ++ programming

Question

Can someone explain to me what the use of a vector class is? My professor mentioned the following sentence in a lecture. Pattern: each vector has a class parameter that determines what type of object this instance will use, commonly called T. I don’t understand what the class parameters mean exactly?

Answer 1

A vector is defined as a pattern, for example:

template<typename T>
class Vector;

To use it, you need to create an instance of the template, for example:

Vector<char> myVector;

. , , T ( char)

,

template<typename T>
class DataHolder{ 
public:
 T data
}

:

DataHolder<char> myChar;

:

class DataHolder
{
public:
 char data;
}

Answer 2

vector ++ . vector.

int arr[];  // Static C++ array with int elements
vector<int> v; // dynamic array with int elements

int - .

, " " . " ".

Answer 3

:

std::vector<int> v;

vector ( ) int. .

There are many resources on the Internet about basic C ++. See, for example, this page for more information on STL vectors.

Answer 4

these two videos give a very good explanation regarding stl and its container iterators.

http://channel9.msdn.com/shows/Going+Deep/C9-Lectures-Introduction-to-STL-with-Stephan-T-Lavavej/

http://channel9.msdn.com/shows/Going+Deep/C9-Lectures-Stephan-T-Lavavej-Standard-Template-Library-STL-2-of-n/