Re: [eigen] Bug in traspose |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] Bug in traspose*From*: Benoît Jacob <jacob@xxxxxxxxxxxxxxx>*Date*: Fri, 18 Jan 2008 07:25:58 +0100

On Friday 18 January 2008 01:48:52 Schleimer, Ben wrote: > --- Benoît Jacob <jacob@xxxxxxxxxxxxxxx> wrote: > > There is a problem with this: > > > Matrix2d m; > > > m <<= (1, 2), > > > (3, 4); > > > > Here the first operator, refers to the object 1 and the compiler will > > treat it as an "int". Since we can't overload operator, on a POD type, I > > see no way to make this work. Same problem with every solution you're > > proposing with a parenthesis ( before the 1. > > I was thinking more about using va_args inside the operator()(...). > Then , can be overloaded to go to the next row. Oh I see. I have not much experience with va_args and wondered if that was considered a clean practice in c++ (and a quick google search suggests it is "not considered typesafe" and is "generally avoided in c++"). > > I wonder how tvmet gets > m = 1, 2, > 3, 4; > > to work if the , operator is only overloaded in the Matrix<> class... Because in tvmet, the Matrix<> class has an overloaded operator= taking a scalar and returning a CommaInitializer. So "m = 1" returns a CommaInitializer, and then ", 2" calls CommaInitializer::operator, . My problem is that this is not compatible with the idea of allowing to construct a matrix by blocks i.e. taking matrices in the initialization list. Indeed the matrix::operator=(matrix) already has the meaning of assignment... Cheers, Benoit

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