deque::at
Returns a reference to the element at a specified location in the deque.
reference at(
size_type _Pos
);
const_reference at(
size_type _Pos
) const;
Parameters
- _Pos
The subscript (or position number) of the element to reference in the deque.
Return Value
If _Pos is greater than the size of the deque, at throws an exception.
Return Value
If the return value of at is assigned to a const_reference, the deque object cannot be modified. If the return value of at is assigned to a reference, the deque object can be modified.
Example
// deque_at.cpp
// compile with: /EHsc
#include <deque>
#include <iostream>
int main( )
{
using namespace std;
deque <int> c1;
c1.push_back( 10 );
c1.push_back( 20 );
const int& i = c1.at( 0 );
int& j = c1.at( 1 );
cout << "The first element is " << i << endl;
cout << "The second element is " << j << endl;
}
Output
The first element is 10 The second element is 20
Requirements
Header: <deque>
Namespace: std