deque::const_reference
A type that provides a reference to a const element stored in a deque for reading and performing const operations.
typedef typename Allocator::const_reference const_reference;
Remarks
A type const_reference cannot be used to modify the value of an element.
Example
// deque_const_ref.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 deque <int> c2 = c1;
const int &i = c2.front( );
const int &j = c2.back( );
cout << "The first element is " << i << endl;
cout << "The second element is " << j << endl;
// The following line would cause an error as c2 is const
// c2.push_back( 30 );
}
Output
The first element is 10 The second element is 20
Requirements
Header: <deque>
Namespace: std