Function leftCols

include/Eigen/Eigen/src/plugins/BlockMethods.h:795–801

typename NColsBlockXpr<internal::get_fixed_value<NColsType>::value>::Type
#else
typename NColsBlockXpr<...>::Type
#endif
leftCols(NColsType n)
{
  return typename NColsBlockXpr<internal::get_fixed_value<NColsType>::value>::Type
            (derived(), 0, 0, rows(), internal::get_runtime_value(n));
}

/// This is the const version of leftCols(NColsType).
template<typename NColsType>