foam-extend4.1-coherent-io/applications/solvers/solidMechanics/elasticNonLinULSolidFoam/findBoundaryPoints.H

//void volPointInterpolation::makeBoundaryAddressing() const
//{

// Go through all patches and mark up the external edge points
labelHashSet pointsCorrectionMap(max(mesh.nPoints()/10, 100));

const fvBoundaryMesh& bm = mesh.boundary();

forAll (bm, patchI)
{
  // If the patch is empty, skip it
  // If the patch is coupled, and there are no cyclic parallels, skip it
  if
    (
     !isA<emptyFvPatch>(bm[patchI])
     && !(
	  bm[patchI].coupled()
	  //&& Pstream::parRun()
	  //&& !mesh.parallelData().cyclicParallel()
	  )
     )
    {
      const labelList& bp = bm[patchI].patch().boundaryPoints();

      const labelList& meshPoints = bm[patchI].patch().meshPoints();

      forAll (bp, pointI)
	{
	  pointsCorrectionMap.insert(meshPoints[bp[pointI]]);
	}
    }
}

// Grab the points to correct
//boundaryPointsPtr_ = new labelList(pointsCorrectionMap.toc());
//labelList& ptc = *boundaryPointsPtr_;
labelList ptc(pointsCorrectionMap.toc());

sort(ptc);