UtilityClass-CSize

UtilityClass-CSize

This class is derived from the SIZE structure. As a result, you can send a CSize as a parameter when a SIZE is required, and the data members of the SIZE structure are also available for use with CSize. The SIZE structure defines the width and height of a rectangle. We use windef.h header file to use it. 

The SIZE (and CSize) cx and cy members are open to the public. In order to modify the SIZE structure, CSize also implements member functions.

Syntax

#include<atltypes.h>
class CSize : public tagSIZE

Header file atltypes.h is required.

Members

Public Constructors

Public Operators

CSize::CSize

Constructs a CSize object.

CSize() throw();
CSize( int initCX, int initCY) throw();
CSize( SIZE initSize) throw();
CSize( POINT initPt) throw();
CSize( DWORD dwSize) throw();

Parameters

Note: cx and cy are initialized to zero if no arguments are provided.

Example

CSize szEmpty;
CSize szPointA(2, 5);

SIZE sz;
sz.cx = 2;
sz.cy = 5;
CSize szPointB(sz);

POINT pt;
pt.x = 2;
pt.y = 5;
CSize szPointC(pt);

CPoint ptObject(2, 5);
CSize szPointD(ptObject);   

DWORD dw = MAKELONG(2, 5);
CSize szPointE(dw);

ASSERT(szPointA == szPointB);
ASSERT(szPointB == szPointC);
ASSERT(szPointC == szPointD);
ASSERT(szPointD == szPointE);

CSize::operator ==

It checks for equality between the two sizes.

BOOL operator==(SIZE size) const throw();
/* If the sizes are equal, then it returns nonzero, otherwise 0.*/

Example

CSize sz1(100, 100);
CSize sz2(100, 100);

ASSERT(sz1 == sz2);

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CSize::operator !=

It checks for inequality between the two sizes.

BOOL operator!=(SIZE size) const throw();
/* If the sizes are not equal, then it returns nonzero, otherwise 0.*/

Example

CSize sz1(88, 88);
CSize sz2(44, 44);

ASSERT(sz1 != sz2);   

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CSize::operator +=

It adds size to this CSize.

void operator+=(SIZE size) throw();

Example

CSize sz1(20, 20);
CSize sz2(10,  5);
sz1 += sz2;

CSize szResult(30, 25);
ASSERT(sz1 == szResult);

/* It works with SIZE, too */

sz1 = CSize(20, 20);
SIZE sz3;
sz3.cx = 10;
sz3.cy = 5;

sz1 += sz3;
ASSERT(sz1 == szResult);   

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CSize::operator -=

It subtracts a size from this CSize.

void operator-=(SIZE size) throw();

Example

CSize sz1(20, 20);
CSize sz2(10,  5);

sz1 -= sz2;

CSize szResult(10, 15);
ASSERT(sz1 == szResult);

/* It works with SIZE, too */

sz1 = CSize(20, 20);
SIZE sz3;
sz3.cx = 10;
sz3.cy = 5;

sz1 -= sz3;
ASSERT(sz1 == szResult);   

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CSize::operator +

These operators add this CSize value to the value of the parameter.

CSize operator+(SIZE size) const throw();
CRect operator+(const RECT* lpRect) const throw();
CPoint operator+(POINT point) const throw();

Example

CSize sz1(20, 20);
CSize sz2(10,  5);
CSize szOutput;

szOutput = sz1 + sz2;

CSize szResult(30, 25);
ASSERT(szOutput == szResult);

/* It works with SIZE, too */

sz1 = CSize(20, 20);
SIZE sz3;
sz3.cx = 10;
sz3.cy = 5;

szOutput = sz1 + sz3;
ASSERT(szOutput == szResult);   

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CSize::operator -

The following first three operators subtract this CSize value to the value of the parameter.

CSize operator-(SIZE size) const throw();
CRect operator-(const RECT* lpRect) const throw();
CPoint operator-(POINT point) const throw();
CSize operator-() const throw();
/*
*  The fourth operator -> the unary minus, 
*  changes the sign of the CSize value.
*/

Example

CSize sz1(20, 20);
CSize sz2(10,  5);
CSize szOut;

szOut = sz1 - sz2;

CSize szResult(10, 15);
ASSERT(szOut == szResult);

/* It works with SIZE, too */

sz1 = CSize(20, 20);
SIZE sz3;
sz3.cx = 10;
sz3.cy = 5;

szOut = sz1 - sz3;
ASSERT(szOut == szResult);

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Frequently Asked Questions

What CSize Class does?

You can send a CSize as a parameter when a SIZE is required, and the data members of the SIZE structure are also available for use with CSize.

What is the use of the SIZE structure?

The SIZE structure defines the width and height of a rectangle. We use windef.h header file to use it.

What is ATL?

ATL stands for Active Template Library. It is a collection of template-based C++ classes that allow you to create small, quick COM(Component Object Model) objects.

Conclusion

In this article, we learned about UtilityClass-CSize. It is one of the several classes provided by Active Template Library.

If you want to explore more, here are some related articles - 

• What is an Active Template Library?
• How to implement ATL objects?
• Introduction to COM

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