Re: equality operator based on position

From:

amirkamerkar@yahoo.com

Newsgroups:

comp.lang.c++

Date:

2 Mar 2007 02:53:13 -0800

Message-ID:

<1172832793.234153.7340@31g2000cwt.googlegroups.com>

On Mar 2, 3:34 pm, "toton" <abirba...@gmail.com> wrote:

Hi,
I have a struct Point { int x, int y; }
The points are stored in a std::vector<Point> points; (global vector)
I want to add equality (operator == ) for the point, which will check
equality based on the position of the point in the vector rather than
its x,y or any other criterion. Thus 2 free point (which are not in
the vector are always unequal ) and so on.
How to add this kind of equality operator ? Is comparing memory
location like this is ok ?
bool operator==(const point& p1,const point& p2){
return &p1 == &p2;

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What do you mean by position in vector ?
Do you want to check the presence of point object in vector ?
You are going to store objects in vector. So if you push an object in
vector a copy is going to get inserted (And hence a different
address). Also, if the vector is required to grow it's going to create
new objects and discard the existing objects.

Amir Kamerkar