Mega Code Archive
Use custom exception in your own Array class
<![CDATA[
#include <iostream>
const int DefaultSize = 10;
// define the exception classes
class ArrayIndexOutofBoundException {};
class BaseArraySizeException
{
public:
BaseArraySizeException(int size):itsSize(size) {}
~BaseArraySizeException(){}
virtual int GetSize() { return itsSize; }
virtual void PrintError()
{ std::cout << "Size error. Received: "
<< itsSize << std::endl; }
protected:
int itsSize;
};
class ArraySizeTooBigException : public BaseArraySizeException
{
public:
ArraySizeTooBigException(int size):BaseArraySizeException(size){}
virtual void PrintError()
{
std::cout << "Too big! Received: ";
std::cout << BaseArraySizeException::itsSize << std::endl;
}
};
class ArraySizeTooSmallException : public BaseArraySizeException
{
public:
ArraySizeTooSmallException(int size):BaseArraySizeException(size){}
virtual void PrintError()
{
std::cout << "Too small! Received: ";
std::cout << BaseArraySizeException::itsSize << std::endl;
}
};
class ArraySizeZeroException : public ArraySizeTooSmallException
{
public:
ArraySizeZeroException(int size):ArraySizeTooSmallException(size){}
virtual void PrintError()
{
std::cout << "Zero!!. Received: ";
std::cout << BaseArraySizeException::itsSize << std::endl;
}
};
class ArraySizeNegativeException : public BaseArraySizeException
{
public:
ArraySizeNegativeException(int size):BaseArraySizeException(size){}
virtual void PrintError()
{
std::cout << "Negative! Received: ";
std::cout << BaseArraySizeException::itsSize << std::endl;
}
};
class Array
{
public:
// constructors
Array(int itsSize = DefaultSize);
Array(const Array &rhs);
~Array() { delete [] pType;}
// operators
Array& operator=(const Array&);
int& operator[](int offSet);
const int& operator[](int offSet) const;
// accessors
int GetitsSize() const { return itsSize; }
// friend function
friend std::ostream& operator<< (std::ostream&, const Array&);
private:
int *pType;
int itsSize;
};
Array::Array(int size):
itsSize(size)
{
if (size == 0)
throw ArraySizeZeroException(size);
if (size < 0)
throw ArraySizeNegativeException(size);
if (size < 10)
throw ArraySizeTooSmallException(size);
if (size > 30000)
throw ArraySizeTooBigException(size);
pType = new int[size];
for (int i = 0; i<size; i++)
pType[i] = 0;
}
int& Array::operator[] (int offset)
{
int size = GetitsSize();
if (offset >= 0 && offset < GetitsSize())
return pType[offset];
throw ArrayIndexOutofBoundException();
return pType[offset];
}
const int& Array::operator[] (int offset) const
{
int size = GetitsSize();
if (offset >= 0 && offset < GetitsSize())
return pType[offset];
throw ArrayIndexOutofBoundException();
return pType[offset];
}
int main()
{
try
{
int choice;
std::cout << "Enter the array size: ";
std::cin >> choice;
Array intArray(choice);
for (int j = 0; j< 100; j++)
{
intArray[j] = j;
std::cout << "intArray[" << j << "] okay..."
<< std::endl;
}
}
catch (ArrayIndexOutofBoundException)
{
std::cout << "Unable to process your input!\n";
}
catch (BaseArraySizeException& theException)
{
theException.PrintError();
}
catch (...)
{
std::cout << "Something went wrong,"
<< "but I've no idea what!" << std::endl;
}
std::cout << "Done.\n";
return 0;
}
Enter the array size: 12
intArray[0] okay...
intArray[1] okay...
intArray[2] okay...
intArray[3] okay...
intArray[4] okay...
intArray[5] okay...
intArray[6] okay...
intArray[7] okay...
intArray[8] okay...
intArray[9] okay...
intArray[10] okay...
intArray[11] okay...
Unable to process your input!
Done.
]]>