vector::operator

Artigo
07/29/2015

Returns a reference to the vector element at a specified position.

reference operator[](
   size_type Pos
);
const_reference operator[](
   size_typePos
) 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 (controlled with _ITERATOR_DEBUG_LEVEL), 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

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