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// Fig 8.5: array1.cpp
// Member function definitions for class Array
#include <iostream>
using std::cout;
using std::cin;
using std::endl;
#include <iomanip>
using std::setw;
#include <new> // C++ standard "new" operator
#include <cstdlib> // exit function prototype
#include "array1.h" // Array class definition
// default constructor for class Array (default size 10)
Array::Array( int arraySize )
{
// validate arraySize
size = ( arraySize > 0 ? arraySize : 10 );
ptr = new int[ size ]; // create space for array
for ( int i = 0; i < size; i++ )
ptr[ i ] = 0; // initialize array
} // end Array default constructor
// copy constructor for class Array;
// must receive a reference to prevent infinite recursion
Array::Array( const Array &arrayToCopy )
: size( arrayToCopy.size )
{
ptr = new int[ size ]; // create space for array
for ( int i = 0; i < size; i++ )
ptr[ i ] = arrayToCopy.ptr[ i ]; // copy into object
} // end Array copy constructor
// destructor for class Array
Array::~Array()
{
delete [] ptr; // reclaim array space
} // end destructor
// return size of array
int Array::getSize() const
{
return size;
} // end function getSize
// overloaded assignment operator;
// const return avoids: ( a1 = a2 ) = a3
const Array &Array::operator=( const Array &right )
{
if ( &right != this ) { // check for self-assignment
// for arrays of different sizes, deallocate original
// left-side array, then allocate new left-side array
if ( size != right.size ) {
delete [] ptr; // reclaim space
size = right.size; // resize this object
ptr = new int[ size ]; // create space for array copy
} // end inner if
for ( int i = 0; i < size; i++ )
ptr[ i ] = right.ptr[ i ]; // copy array into object
} // end outer if
return *this; // enables x = y = z, for example
} // end function operator=
// determine if two arrays are equal and
// return true, otherwise return false
bool Array::operator==( const Array &right ) const
{
if ( size != right.size )
return false; // arrays of different sizes
for ( int i = 0; i < size; i++ )
if ( ptr[ i ] != right.ptr[ i ] )
return false; // arrays are not equal
return true; // arrays are equal
} // end function operator==
// overloaded subscript operator for non-const Arrays
// reference return creates an lvalue
int &Array::operator[]( int subscript )
{
// check for subscript out of range error
if ( subscript < 0 || subscript >= size ) {
cout << "\nError: Subscript " << subscript
<< " out of range" << endl;
exit( 1 ); // terminate program; subscript out of range
} // end if
return ptr[ subscript ]; // reference return
} // end function operator[]
// overloaded subscript operator for const Arrays
// const reference return creates an rvalue
const int &Array::operator[]( int subscript ) const
{
// check for subscript out of range error
if ( subscript < 0 || subscript >= size ) {
cout << "\nError: Subscript " << subscript
<< " out of range" << endl;
exit( 1 ); // terminate program; subscript out of range
} // end if
return ptr[ subscript ]; // const reference return
} // end function operator[]
// overloaded input operator for class Array;
// inputs values for entire array
istream &operator>>( istream &input, Array &a )
{
for ( int i = 0; i < a.size; i++ )
input >> a.ptr[ i ];
return input; // enables cin >> x >> y;
} // end function
// overloaded output operator for class Array
ostream &operator<<( ostream &output, const Array &a )
{
int i;
// output private ptr-based array
for ( i = 0; i < a.size; i++ ) {
output << setw( 12 ) << a.ptr[ i ];
if ( ( i + 1 ) % 4 == 0 ) // 4 numbers per row of output
output << endl;
} // end for
if ( i % 4 != 0 ) // end last line of output
output << endl;
return output; // enables cout << x << y;
} // end function operator<<
/**************************************************************************
* (C) Copyright 1992-2003 by Deitel & Associates, Inc. and Prentice *
* Hall. All Rights Reserved. *
* *
* DISCLAIMER: The authors and publisher of this book have used their *
* best efforts in preparing the book. These efforts include the *
* development, research, and testing of the theories and programs *
* to determine their effectiveness. The authors and publisher make *
* no warranty of any kind, expressed or implied, with regard to these *
* programs or to the documentation contained in these books. The authors *
* and publisher shall not be liable in any event for incidental or *
* consequential damages in connection with, or arising out of, the *
* furnishing, performance, or use of these programs. *
*************************************************************************/
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