deque::assign and deque::swap

Illustrates how to use the deque::assign and deque::swap Standard Template Library (STL) functions in Visual C++.

void assign( 
   const_iterator First, 
   const_iterator Last 
); 
void assign( 
   size_type n, 
   const T& x = T( ) 
); 
void swap( 
   deque& Dq 
);

Remarks

The first assign member function replaces the sequence controlled by *this with the sequence [First, Last). The second assign member function replaces the sequence controlled by *this with a repetition of n elements of value x. The swap member function swaps the contents between *this and Dq.

Example

// deque.cpp
// compile with: /EHsc
//
// Functions:
//
//    assign
//    swap
//    begin
//    end

#include <iostream>
#include <deque>

using namespace std;


typedef deque<char >  CHARDEQUE;
void print_contents (CHARDEQUE  deque, char*);

int main()
{
    //create a  with  3 A's
    CHARDEQUE  a(3,'A');

    //create b with 4 B's.
    CHARDEQUE  b(4,'B');

    //print out the contents
    print_contents (a,"a");
    print_contents (b,"b");

    //swap a and b
    a.swap(b);
    print_contents (a,"a");
    print_contents (b,"b");

    //swap it back
        a.swap(b);
    print_contents (a,"a");
    print_contents (b,"b");

    //assign the contents of b to a
    a.assign(b.begin(),b.end());
    print_contents (a,"a");

    //assign the first two items of b to a
    a.assign(b.begin(),b.begin()+2);
    print_contents (a,"a");

    //assign 3 'Z's to a
    a.assign(3,'Z');
    print_contents (a,"a");

    }

//function to print the contents of deque
void print_contents (CHARDEQUE  deque, char *name)
{
    CHARDEQUE::iterator pdeque;

    cout <<"The contents of "<< name <<" : ";

        for(pdeque = deque.begin();
        pdeque != deque.end();
        pdeque++)
    {
        cout << *pdeque <<" " ;
    }
        cout<<endl;
}

Output

The contents of a : A A A 
The contents of b : B B B B 
The contents of a : B B B B 
The contents of b : A A A 
The contents of a : A A A 
The contents of b : B B B B 
The contents of a : B B B B 
The contents of a : B B 
The contents of a : Z Z Z 

Requirements

Header: <deque>

See Also

Concepts

Standard Template Library Samples