The sample code is this article illustrates how to use the
deque::push_front and deque::pop_front STL functions in Visual C++. Deque is a
double-ended queue where elements can be inserted and removed from the front
and from the back.
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Required Header
<deque>
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Prototype
void push_front(const T& x);
void pop_front();
: The class/parameter names in the prototype may not match the
version in the header file. Some have been modified to improve readability.
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Description
The push_front function inserts an element with value x at the
beginning of the deque container. The pop_front function removes the first
element of the deque container, which must be non-empty.
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Sample Code
NOTE: In the first line of the sample code section, /GX is equivalent
to /EHsc in Visual C++ .NET
or in Visual C++ 2005 and is set by default.
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: -GX
//
// deque.cpp :
//
// Functions:
//
// deque::push_front
// deque::pop_front
//
// Written by Bobby Mattappally
// of Microsoft Product Support Services,
// Copyright (c) 1996 Microsoft Corporation. All rights reserved.
//////////////////////////////////////////////////////////////////////
/* Compile options needed:-GX
*/
#include <iostream>
#include <deque>
#if _MSC_VER > 1020 // if VC++ version is > 4.2
using namespace std; // std c++ libs implemented in std
#endif
typedef deque<int, allocator<int> > INTDEQUE;
void printcontents (INTDEQUE deque);
void 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 ;
}
}
Program output is:
The output is:
3
2
1
The output is:
2
1
The output is:
1
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Visual C++ Books On Line: Visual C++ Books:C/C++:Standard
C++ Library Reference.
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