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A templated cross-type copy constructor question

3 posts in this topic

This question actually bears little relevance to what I'm doing, but it did make me curious.

I have a color class called IColor, which extends from an IColorBase template class like:

[b]typedef IColorBase<float> IColor;[/b]

IColorBase is a generic base class that provides the usual constructors and operator overloading and not much else. What got me interested, though, was handling a cross-type copy constructor like:

[b]IColor color = RGB(0, 255, 0);[/b]

RGB() is a macro that splices byte components into a DWORD. The copy constructor looks like this:

[b]IColorBase(DWORD& clr) { BYTE* _c = (BYTE*)&clr; r = _c[0] / 255.f; g = _c[1] / 255.f; b = _c[2] / 255.f; a = 1; }[/b]

My question, however, has to do with multi-type copy constructors. Let's say I also have:

[b]typedef IColorBase<BYTE> IRGBA;[/b]

Whose copy constructor would look like this:

[b]IColorBase(DWORD& clr) { BYTE* _c = (BYTE*)&clr; r = _c[0]; g = _c[1]; b = _c[2]; a = 255; }[/b]

Including two constructors that take the same input argument type, however, doesn't make sense without a specific type declaration. In other words, I'd need [i]something like[/i] this:

[b]IColorBase[u]<float>[/u](DWORD clr) { BYTE* _c = (BYTE*)&clr; r = _c[0] / 255.f; g = _c[1] / 255.f; b = _c[2] / 255.f; a = 1; }[/b]
[b]IColorBase[u]<BYTE>[/u](DWORD clr) { BYTE* _c = (BYTE*)&clr; r = _c[0] / 255.f; g = _c[1] / 255.f; b = _c[2] / 255.f; a = 1; }[/b]

Which, of course, doesn't work. Is it possible to provide type-aware constructors like this or does the standard not allow it at all? After all, it's possible for assignment operators.

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Thanks for the replies, guys! I could probably have take it myself from "template specialization", though.

Cornstalks - you're right about it not being a copy constructor. In this case the word of the law does defeat the spirit of it :)

Did you intent for the constructors for IColorBase<float> and IColorBase<BYTE> to be exactly identical?

Yeah - that's a copy-paste thing.

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