The sample code below illustrates how to use the deque::assign
and deque::swap
STL functions in Visual C++.
Required Header:
< deque>
void assign(const_iterator first, const_iterator last);
void assign(size_type n, const T& x = T());
void swap(deque& dq);
Note: The class/parameter names in the prototype do not match the version in the header file. Some have been modified to improve readability.
Description:
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.
Sample Code:
//////////////////////////////////////////////////////////////////////
//
// Compile options needed: -GX
//
// deque.cpp :
//
// Functions:
//
// assign
// swap
// begin
// end
//////////////////////////////////////////////////////////////////////
/* Compile options needed:-GX
*/
#include <iostream>
#include <deque>
using namespace std;
typedef deque<char > CHARDEQUE;
void print_contents (CHARDEQUE deque, char*);
void 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");
// let us 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;
}
Program Output is:
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