[eigen] A piece of code that has me confused

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In the file unsupported/Eigen/src/SparseExtra/SimplicialCholesky.h the
method _solve uses the template keyword in a way I have not seen

	  if(m_matrix.nonZeros()>0) // otherwise L==I
	      m_matrix.template triangularView<UnitLower>().solveInPlace(dest);

Can anyone point me to documentation on that usage?

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