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Ferry Ledi Tjandra
Guest
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 Posted: Fri Aug 06, 2004 5:51 am Post subject: design class for object |
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Dear Folk,
considering I'm new user of C,
so I don't have good background for desingning class.
My problem is creating object and collection of objects
For example I have Point Object.
class Point
{
public:
int X,Y,Z;
Point(int x, int y, int z) X=x;Y=y;Z=z;
}
then i have collection of points, and I designed Points Class
class Points
{
public:
void AddPoint(Point pt);
Point PointItem(int iIndex);
}
So how I can add the point object into Points class and how I can maintain every point object, so I can do manipulation for this object property.
Regards,
********************************************************************************
Ferry Ledi Tjandra * フェリ・レディ・チャンドラ
Asia Air Survey Co., Ltd. * アジア航測株式会社
Research and Development Departement * .総合研究所・研究部
TEL: +81-44-969-7309 (International ----- 国際)
044-969-7309 (within Japan ------- 国内）
Website: http://www.ajiko.co.jp
E-Mai: [email]ltj.ferry (AT) ajico (DOT) co.jp[/email]
********************************************************************************
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Damon Chandler (TeamB)
Guest
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| Posted: Thu Aug 12, 2004 6:47 am Post subject: Re: design class for object |
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Hi Ferry,
| Quote: | My problem is creating object and collection of objects
For example I have Point Object.
class Point
{
public:
int X,Y,Z;
Point(int x, int y, int z) X=x;Y=y;Z=z;
}
|
Typically, the X, Y, and Z members would be declared in the private
section so that they're not directly accessible from outside of the
class; you'd then provide "getter" and "setter" functions...
class Point
{
public:
Point(int x=0, int y=0, int z=0) : X(x), Y(y), Z(z) {}
// add copy constructor(s) as needed
public:
int getX() { return X; }
int getY() { return Y; }
int getZ() { return Z; }
void setX(int x) { X = x; }
void setY(int y) { Y = y; }
void setZ(int z) { Z = z; }
private:
int X, Y, Z;
};
| Quote: | then i have collection of points, and I designed Points Class
class Points
{
public:
void AddPoint(Point pt);
Point PointItem(int iIndex);
}
|
The easiest way to maintain a collection of objects is to use a pre-made
container class. For example, using the STL vector class, you'd do...
#include <vector>
class Points
{
public:
// add constructor(s) as needed
public:
void AddPoint(Point const& P)
{
list_of_points_.push_back(P);
}
Point PointItem(int iIndex)
{
return list_of_points_.at(iIndex);
}
private:
std::vector<Point> list_of_points_;
};
You might also be interested in the following chapter...
http://www.arirom.com/eng/OOP/ThinkingCpp/Vol_2/textC2/Chap07.htm
Good luck,
--
Damon (TeamB)
C++Builder Developer's Journal <http://bcbjournal.org>
BCBCAQ <http://caq.bcbjournal.org>
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