vector::operator
Returns a reference to the vector element at a specified position.
reference operator[](
size_type _Pos
);
const_reference operator[](
size_type_Pos
) const;
Parameters
Parameter |
Description |
_Pos |
The position of the vector element. |
Return Value
If the position specified is greater than or equal to the size of the container, the result is undefined.
Remarks
If the return value of operator[] is assigned to a const_reference, the vector object cannot be modified. If the return value of operator[] is assigned to a reference, the vector object can be modified.
When compiling with _SECURE_SCL 1, a runtime error will occur if you attempt to access an element outside the bounds of the vector. See Checked Iterators for more information.
Example
// vector_op_ref.cpp
// compile with: /EHsc
#include <vector>
#include <iostream>
int main( )
{
using namespace std;
vector <int> v1;
v1.push_back( 10 );
v1.push_back( 20 );
int& i = v1[1];
cout << "The second integer of v1 is " << i << endl;
}
Output
The second integer of v1 is 20
Requirements
Header: <vector>
Namespace: std