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cpp try , new and catch tutorials       Share
2008-09-28 |  RatheeshTR  | Viewed: 112  |    0

#include <iostream>
#include <memory>

using namespace std;



class myException

{

public:

char * errorMsg() { return "Oops."; }
};


class Point

{

public:

Po
int (int x, int y):myX(x), myY(y) { cout << "Point constructor called"<< endl;}
Po
int (const Point & rhs):
myX(rhs.myX),

myY(rhs.myY){ cout << "Po
int copy constructor called" << endl;}
~Point(){ cout << "Po
int destructor called" << endl;}
int GetX() const { return myX; }
void SetX(int x) { myX = x; }
int GetY() const { return myY; }
void SetY(int y) { myY = y; }
private:

int myX;
int myY; 
};


class Rectangle

{

public:

Rectangle( Po
int upperLeft, Point lowerRight ):
myUpperLeft(new Point(upperLeft)),

myLowerRight(new Point(lowerRight))

{}


Rectangle( auto_ptr<Point> pUpperLeft, auto_ptr<Point> pLowerRight ):

myUpperLeft (new Point(*pUpperLeft)),

myLowerRight(new Point(*pLowerRight))

{}



Rectangle( 
int upperLeftX, int upperLeftY, int lowerRightX, int lowerRightY ):
myUpperLeft(new Point(upperLeftX,upperLeftY)),

myLowerRight(new Point(lowerRightX,lowerRightY))

{}


Rectangle( const Rectangle & rhs ):

myUpperLeft(new Point(*myUpperLeft)),

myLowerRight(new Point(*myLowerRight))

{}


~Rectangle(){ cout << "In Rectangle's destructor" << endl;  }



int GetWidth() { return myLowerRight->GetX() - myUpperLeft->GetX(); }
int GetHeight() { return myLowerRight->GetY() - myUpperLeft->GetY(); }

void DangerousMethod() { throw myException(); }

 private:

auto_ptr<Point> myUpperLeft;

auto_ptr<Point> myLowerRight;

};



int main()
{


try

{

cout << "Begin round 1..." << endl;

auto_ptr<Point> pUL(new Point(0,0));

auto_ptr<Point> newAutoPtr = pUL;

auto_ptr<Point> pLR(new Point(20,30));

Rectangle myRectangle(pUL, pLR);

int w = myRectangle.GetWidth();
int h = myRectangle.GetHeight();
cout << "the Rectangle is " << w << " by " << h << endl;

}

catch ( myException & e )

{


cout << "caught exception: " << e.errorMsg() << "\n\n" << endl;

}



try

{

cout << "Begin round 2..." << endl;

auto_ptr<Point> pUL(new Point(0,0));

auto_ptr<Point> pLR(new Point(20,30));

Rectangle myRectangle(pUL, pLR);


int w = myRectangle.GetWidth();
int h = myRectangle.GetHeight();
cout << "the Rectangle is " << w << " by " << h << endl;

myRectangle.DangerousMethod();

}

catch ( myException & e )

{

cout << "caught exception: " << e.errorMsg() << "\n\n" << endl;

}



return 0;

}



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Tech: C ,Cpp
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