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06-18-2009, 10:36 AM
| #1 |
| Registered User  Join Date: Jun 2008 Location: NYC
Posts: 262
| Can someone explain this code? Code: for SpectrumColor operator++(SpectrumColor &s, int dummy)
{
return s = (s >= Violet) ? Red : SpectrumColor(s + 1);
}
|
| Sharke is offline |  |
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06-18-2009, 10:42 AM
| #2 |
| C++ Witch  Join Date: Oct 2003 Location: Singapore
Posts: 11,353
| It looks like a typographical error: without the for, it would just be a non-member postfix operator++.
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06-18-2009, 11:22 AM
| #3 | |
| The larch Join Date: May 2006
Posts: 3,222
| Also, it seems that it is operator++ for an enum: Code: #include <iostream>
enum SpectrumColor { Red, Orange, Yellow, Green, Blue, Indigo, Violet };
SpectrumColor operator++(SpectrumColor &s, int dummy)
{
return s = (s >= Violet) ? Red : SpectrumColor(s + 1);
}
int main()
{
SpectrumColor col = Blue;
col++;
std::cout << col << ' ';
col++;
std::cout << col << '\n';
col++;
std::cout << col << '\n';
}
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06-18-2009, 12:12 PM
| #4 |
| Registered User Join Date: Jun 2008 Location: NYC
Posts: 262
| Aha, I'd hoped it was an error because it sure as hell didn't look like anything that made sense to me with that "for." Here I was worrying that I'd skipped a couple of chapters. Well, I guess I'll check the website for the errata. |
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