Re: [eigen] two decisions to take |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] two decisions to take*From*: Donald Ephraim Curtis <donald-curtis@xxxxxxxxx>*Date*: Mon, 3 Sep 2007 00:47:31 -0500

For things like cross product, i would probably prefer global functions. However, i think there might be interest to do vector1.cross(vector2) to mean, cross v1 with v2 and store in v1... like in the case v1 x= v2? Would that ever become a concern? -- Donald (Mon, Sep 03, 2007 at 07:34:00AM +0200) Benoît Jacob <jacob@xxxxxxxxxxxxxxx>: > Hi List, > > I need your advice for two decisions to take. > > 1) Global functions or member methods? > Global functions give more natural mathematical notation. For instance, for a > cross product: > double d = cross(vector1, vector2); > vs. > double d = vector1.cross(vector2); > Moreover I don't think they really pollute the namespace (which can be the > global one if the user did "using namespace Eigen") as C++ allows overloading > and I'll make sure to write these functions as taking arguments of Eigen > types only. > > So are you OK if I implement many mathematical functions as global funcs and > not as members? Or do you see a reason to prefer them to be only members, or > both? > > 2) LGPL v3 ? > The main reason why we didn't license Eigen 1 as LGPL was that v2 didn't make > sense for a template library. v3 seems to have fixed that. Indeed, whereas v2 > talked about "linking", v3 talks about "combining or linking". So should we > convert to LGPL v3? > > Looking at the table here, > http://www.gnu.org/licenses/gpl-faq.html#AllCompatibility > > if we license as LGPL v3, then GPL-v2-only projects can't use Eigen. That's a > problem, but how big is it? Are there many GPL-v2-only projects out there? > > What we gain in licensing as LGPL v3 is that we don't need an exception > anymore, we can just use the plain vanilla LGPL v3. That's a big advantage. > > Thanks, > Benoit

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**Follow-Ups**:**Re: [eigen] two decisions to take***From:*Benoît Jacob

**Re: [eigen] two decisions to take***From:*Andre Krause

**References**:**[eigen] two decisions to take***From:*Benoît Jacob

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