About ZBuffer ( probably a stupid question)

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About ZBuffer ( probably a stupid question)

Post by slavaxd » January 26th, 2023, 1:38 pm

In the series the ZBuffer class has an overload for the At method:

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	float& At(int x, int y)
		assert(x >= 0);
		assert(x < width);
		assert(y >= 0);
		assert(y < height);
		return pBuffer[y * width + x];
	const float& At(int x, int y) const
		return const_cast<ZBuffer*>(this)->At(x, y);
My question is why is it using const_cast<Zbuffer> rather than const_cast<float*>? I mean, the point of this is to return a CONST reference to the pbuffer amiright?

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Re: About ZBuffer ( probably a stupid question)

Post by LuisR14 » May 20th, 2023, 7:46 pm

the point is to remove the constness of the this pointer to be able to invoke its non-const At method (it expects/needs to work with a non-const ZBuffer)

edit: (forgot to include)
without the cast, it would become a recursive call to the function itself (instead of calling that non-const method)
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