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- To: eigen@xxxxxxxxxxxxxxxxxxx
- Subject: Re: [eigen] A piece of code that has me confused
- From: Douglas Bates <bates@xxxxxxxxxxxxx>
- Date: Wed, 20 Jul 2011 14:47:18 -0500
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On Wed, Jul 20, 2011 at 2:20 PM, Christoph Hertzberg
<chtz@xxxxxxxxxxxxxxxxxxxxxxxx> wrote:
> On 20.07.2011 21:05, Douglas Bates wrote:
>>
>> In the file unsupported/Eigen/src/SparseExtra/SimplicialCholesky.h the
>> method _solve uses the template keyword in a way I have not seen
>> before:
>>
>>
>> if(m_matrix.nonZeros()>0) // otherwise L==I
>> m_matrix.template
>> triangularView<UnitLower>().solveInPlace(dest);
>>
>> Can anyone point me to documentation on that usage?
>
> Short answer: Since the compiler does not know the actual type of m_matrix,
> it can't be sure whether triangularView is a member variable or a templated
> function, by using template it is told that it is the latter.
> Here is a pretty good answer to that question:
> http://stackoverflow.com/questions/610245/where-and-why-do-i-have-to-put-template-and-typename-on-dependent-names
> HTH
> Christoph
It certainly does help. Thank you.