pfarrayd.cpp

来自「AbsoluteC++中文第二版书上的源代码」· C++ 代码 · 共 72 行

//This is the IMPLEMENTATION FILE: pfarrayd.cpp. 
//This is the IMPLEMENTATION of the class PFArrayD.
//The interface for the class PFArrayD is in the file pfarrayd.h.

#include "pfarrayd.h"
#include <iostream>
using std::cout;

PFArrayD::PFArrayD( ) :capacity(50), used(0)
{
    a = new double[capacity];
}

PFArrayD::PFArrayD(int size) :capacity(size), used(0)
{
    a = new double[capacity];
}

PFArrayD::PFArrayD(const PFArrayD& pfaObject) 
  :capacity(pfaObject.getCapacity( )), used(pfaObject.getNumberUsed( ))
{
    a = new double[capacity];
    for (int i =0; i < used; i++)
        a[i] = pfaObject.a[i];
}

void PFArrayD::addElement(double element)
{
    if (used >= capacity)
    {
        cout << "Attempt to exceed capacity in PFArrayD.\n";
        exit(0);
    }
    a[used] = element;
    used++;
}

double& PFArrayD::operator[](int index)
{
    if (index >= used)
    {
        cout << "Illegal index in PFArrayD.\n";
        exit(0);
    }

    return a[index];
}

PFArrayD& PFArrayD::operator =(const PFArrayD& rightSide)
{
    if (capacity != rightSide.capacity)
    {
        delete [] a;
        a = new double[rightSide.capacity];
    }

    capacity = rightSide.capacity;
    used = rightSide.used;
    for (int i = 0; i < used; i++)
        a[i] = rightSide.a[i];

    return *this;
}

PFArrayD::~PFArrayD( )
{
    delete [] a;
}