C++ vector data() usage and example

C++ Vector (Container)

In C++11In it, vector has added the usage of data(), which returns a pointer to the first element of the array pointed to by the built-in vector.

Syntax

Vector (vector) 'v' and pointer 'p'. The syntax is:

data_type　*p = v.data();

Parameters

It does not contain any parameters.

Return value

It returns a pointer to the array.

Example1

Let's look at a simple example.

Example

#include　<iostream>　　
#include<vector>　　
using namespace std;　　
int main()　　
{　　
vector<int> v{10,20,30,40,50};　　
int　*k=v.data();　　
for(int i=0;i<v.size();i++)　　
cout<<*k++<<"  ";　　
return 0;　　
}

Output Result:

10　20　30　40　50

Example2

Let's look at a simple example.

Example

#include　<iostream>
#include<vector>
using namespace std;
int main()
{
vector<string> v{"C","C++","Java",".Net"};
string　*k=v.data();
for(int i=0;i<v.size();i++)
cout<<*k++<<"  ";
return 0;
}

Output Result:

C C++　Java .Net

In this example, k is a pointer of string type that points to an element of the vector v.

C++ Vector (Container)