deque::push_front and deque::pop_front

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

void push_front(
   const T& x
);
void pop_front( );

Remarks

注意

The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.

The deque::push_front function inserts an element with value x at the beginning of the deque container. The deque::pop_front function removes the first element of the deque container, which must be nonempty.

Example

// pushfron.cpp
// compile with: /EHsc

#include <iostream>
#include <deque>

using namespace std;


typedef deque<int >  INTDEQUE;
void printcontents (INTDEQUE  deque);

int main()
{
    INTDEQUE  dequetest;

    dequetest.push_front(1);
    dequetest.push_front(2);
    dequetest.push_front(3);
    printcontents (dequetest);
    dequetest.pop_front();
    printcontents (dequetest);
    dequetest.pop_front();
    printcontents (dequetest);
}

//function to print the contents of deque
void printcontents (INTDEQUE  deque)
{
    INTDEQUE::iterator pdeque;

    cout <<"The output is:"<<endl;

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

Output

The output is:
3
2
1
The output is:
2
1
The output is:
1

Requirements

Header: <deque>

See Also

Concepts

Standard Template Library Samples