Using exceptions with templates. : template class « Class « C++






  1. C++
  2. Class
  3. template class

Using exceptions with templates.

  
#include <iostream>
using namespace std;
const int DefaultSize = 10;
class xBoundary {};

template <class T>
class Array
{
public:
    Array(int itsSize = DefaultSize);
    Array(const Array &rhs);
    ~Array() { delete [] pType;}

    Array& operator=(const Array<T>&);
    T& operator[](int offSet);
    const T& operator[](int offSet) const;

    int GetitsSize() const { return itsSize; }

    friend ostream& operator<< (ostream&, const Array<T>&);

    class xSize {};

 private:
    int *pType;
    int  itsSize;
 };

 template <class T>
 Array<T>::Array(int size):
 itsSize(size)
 {
    if (size <10 || size > 30000)
       throw xSize();
    pType = new T[size];
    for (int i = 0; i<size; i++)
      pType[i] = 0;
 }

 template <class T>
 Array<T>& Array<T>::operator=(const Array<T> &rhs)
 {
    if (this == &rhs)
       return *this;
    delete [] pType;
    itsSize = rhs.GetitsSize();
    pType = new T[itsSize];
    for (int i = 0; i<itsSize; i++)
       pType[i] = rhs[i];
 }
 template <class T>
 Array<T>::Array(const Array<T> &rhs)
 {
    itsSize = rhs.GetitsSize();
    pType = new T[itsSize];
    for (int i = 0; i<itsSize; i++)
       pType[i] = rhs[i];
 }

 template <class T>
 T& Array<T>::operator[](int offSet)
 {
    int size = GetitsSize();
    if (offSet >= 0 && offSet < GetitsSize())
       return pType[offSet];
    throw xBoundary();
    return pType[0];
 }

 template <class T>
 const T& Array<T>::operator[](int offSet) const
 {
    int mysize = GetitsSize();
    if (offSet >= 0 && offSet < GetitsSize())
       return pType[offSet];
    throw xBoundary();
 }

 template <class T>
 ostream& operator<< (ostream& output, const Array<T>& theArray)
 {
    for (int i = 0; i<theArray.GetitsSize(); i++)
       output << "[" << i << "] " << theArray[i] << endl;
    return output;
 }
int main(){
    try
    {
       Array<int> intArray(9);
       for (int j = 0; j< 100; j++)
        {
           intArray[j] = j;
           cout << "intArray[" << j << "] okay..." << endl;
        }
     }
     catch (xBoundary)
     {
        cout << "Unable to process your input!\n";
     }
     catch (Array<int>::xSize)
     {
        cout << "Bad Size!\n";
     }

     cout << "Done.\n";
     return 0;
}








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