deque::size and deque::resize

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

size_type size( ) const; 
void resize(
   size_type n,
   T x = T( )
);
size_type max_size( ) const;

Remarks

Note

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

The size member function returns the length of the controlled sequence. The resize member function ensures that size henceforth returns n. If it must make the controlled sequence longer, it appends elements with value x. If no value is supplied, the default value depends upon the type. For example, if it is a deque of chars, the default is a blank. If it is a deque of ints, the default is zero. The max_size member function returns the length of the longest sequence that the object can control.

Example

// sizeresi.cpp
// compile with: /EHsc
//
// Functions:
//    size
//    resize
//    max_size
//    begin
//    end

#include <iostream>
#include <deque>

using namespace std;

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

int main()
{
    //create a  with  A, B, C and D
    CHARDEQUE  a;
    a.push_back('A');
    a.push_back('B');
    a.push_back('C');
    a.push_back('D');

    //print out the contents

    print_contents (a,"a");
    cout <<"max_size of a is " <<a.max_size() <<endl;
    cout <<"size of a is " <<a.size() <<endl;

    //let us increase the size to 10
    // and set the new elements to be 'X'
    a.resize(10,'X');
    print_contents (a,"a");
    cout <<"size of a is " <<a.size() <<endl;

    //let us resize it to 5
    a.resize(5);
    print_contents (a,"a");
    cout <<"size of a is " <<a.size() <<endl;
    cout <<"max_size of a is still " <<a.max_size() <<endl;

    }

//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;
}

Sample Output

The following output is for x86.

The contents of a : A B C D
max_size of a is 4294967295
size of a is 4
The contents of a : A B C D X X X X X X
size of a is 10
The contents of a : A B C D X
size of a is 5
max_size of a is still 4294967295

Requirements

Header: <deque>

See Also

Concepts

Standard Template Library Samples