Re: [eigen] matrix exponential with c++0x |

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*To*: eigen@xxxxxxxxxxxxxxxxxxx*Subject*: Re: [eigen] matrix exponential with c++0x*From*: mmoll <Markus.Moll@xxxxxxxxxxxxxxxx>*Date*: Thu, 3 Dec 2009 16:01:24 +0100

Hi Quoting Hauke Heibel <hauke.heibel@xxxxxxxxxxxxxx>: > Well, over here removing the 'typename' in front of _Function fixes > the > compilation for GCC. > > typedef _Functor Functor; Just a side note: avoid all names like _UnderscoreUppercase and doubleunderscore__anywhere, they are reserved for the library implementation. With something as generic as _Functor I see a real danger of collision there (_Functor could be an arbitrarily mean macro...). (But I wouldn't recommend using _EigenAvoidNameClashFunctor either) > You only need the typename when the type you want to redefine is a > nested template type depending on the class's template parameters. > Unfortunately, VC9 neither complains when the the typename keyword is > missing nor when it is given and not required - both cases are > treated as compilation errors by GCC. And you can't force it to emit an error (by something equivalent to -pedantic)? Actually, the current standard's requirement of not using typename where it's not needed is annoying. It can stop you from writing really generic code. If you have a class template with a typedef in it that could either alias a non-template class or another templated class dependent on the same parameter as the outer template, then you actually have to remember that choice everywhere you use the typedef, because in one case you need to write "typename typedefname::inner i;", in the other "typedefname::inner i;" (Does anyone know if that is "fixed" in C++0x?) Markus

**Follow-Ups**:**Re: [eigen] matrix exponential with c++0x***From:*Benoit Jacob

**References**:**Re: [eigen] matrix exponential with c++0x***From:*Hauke Heibel

**Re: [eigen] matrix exponential with c++0x***From:*Björn Piltz

**Re: [eigen] matrix exponential with c++0x***From:*Thomas Capricelli

**Re: [eigen] matrix exponential with c++0x***From:*Hauke Heibel

**Re: [eigen] matrix exponential with c++0x***From:*Hauke Heibel

**Re: [eigen] matrix exponential with c++0x***From:*Björn Piltz

**Re: [eigen] matrix exponential with c++0x***From:*Hauke Heibel

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