fix dof_accessor warning

[tjhei]

fixes:

/jenkins/workspace/dealii_PR-10786/include/deal.II/base/exceptions.h:1414:72:
error: ‘fe_index_’ may be used uninitialized in this function [-Werror
=maybe-uninitialized]
/jenkins/workspace/dealii_PR-10786/include/deal.II/dofs/dof_accessor.templates.h:284:22:
note: ‘fe_index_’ was declared here

part of #10786

[tjhei]

this if is redundant because we exit a couple of lines above otherwise.

[peterrum]

I am pretty sure that did what you did once. Maybe locally!?

[peterrum]

Suggested change

	fe_index_ =
	unsigned int fe_index_ =

[peterrum]

OK. I did it here:

dealii/include/deal.II/dofs/dof_accessor.templates.h

Lines 339 to 429 in ade0b73

	template <int dim, int spacedim, int d>
	static std::pair<unsigned int, unsigned int>
	process_object_range(const DoFHandler<dim, spacedim> &dof_handler,
	const unsigned int obj_level,
	const unsigned int obj_index,
	const unsigned int fe_index,
	const std::integral_constant<int, d> &)
	{
	Assert(d == dim || obj_level == 0, ExcNotImplemented());
	// determine range of dofs in global data structure
	// 1) cell
	if (d == dim)
	{
	const unsigned int ptr_0 =
	dof_handler.object_dof_ptr[obj_level][d][obj_index];
	const unsigned int ptr_1 =
	ptr_0 +
	dof_handler.get_fe(fe_index).template n_dofs_per_object<dim>();
	return {ptr_0, ptr_1};
	}
	// 2) hp is not used -> fe_index == 0
	if (dof_handler.hp_capability_enabled == false)
	{
	AssertDimension(fe_index,
	(DoFHandler<dim, spacedim>::default_fe_index));
	// vertex -> no pointers are saved
	if (d == 0)
	{
	const unsigned int ptr_0 =
	obj_index * dof_handler.get_fe().n_dofs_per_vertex();
	const unsigned int ptr_1 =
	ptr_0 + dof_handler.get_fe().n_dofs_per_vertex();
	return {ptr_0, ptr_1};
	}
	else // line or quad
	{
	const unsigned int ptr_0 =
	dof_handler.object_dof_ptr[obj_level][d][obj_index];
	const unsigned int ptr_1 =
	dof_handler.object_dof_ptr[obj_level][d][obj_index + 1];
	return {ptr_0, ptr_1};
	}
	}
	// 3) hp is used
	AssertIndexRange(obj_level, dof_handler.object_dof_indices.size());
	AssertIndexRange(d, dof_handler.object_dof_indices[obj_level].size());
	AssertIndexRange(d, dof_handler.hp_object_fe_ptr.size());
	AssertIndexRange(obj_index, dof_handler.hp_object_fe_ptr[d].size());
	const auto fe_index_local_ptr =
	std::find(dof_handler.hp_object_fe_indices[d].begin() +
	dof_handler.hp_object_fe_ptr[d][obj_index],
	dof_handler.hp_object_fe_indices[d].begin() +
	dof_handler.hp_object_fe_ptr[d][obj_index + 1],
	fe_index);
	Assert(fe_index_local_ptr !=
	dof_handler.hp_object_fe_indices[d].begin() +
	dof_handler.hp_object_fe_ptr[d][obj_index + 1],
	ExcNotImplemented());
	const unsigned int fe_index_local =
	std::distance(dof_handler.hp_object_fe_indices[d].begin() +
	dof_handler.hp_object_fe_ptr[d][obj_index],
	fe_index_local_ptr);
	AssertIndexRange(dof_handler.hp_object_fe_ptr[d][obj_index] +
	fe_index_local,
	dof_handler.object_dof_ptr[obj_level][d].size());
	const unsigned int ptr_0 =
	dof_handler
	.object_dof_ptr[obj_level][d]
	[dof_handler.hp_object_fe_ptr[d][obj_index] +
	fe_index_local];
	const unsigned int ptr_1 =
	dof_handler
	.object_dof_ptr[obj_level][d]
	[dof_handler.hp_object_fe_ptr[d][obj_index] +
	fe_index_local + 1];
	return {ptr_0, ptr_1};
	}

[bangerth]

OK with the one change.

[masterleinad]

/rebuild