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[Garth Wells <702372@xxxxxxxxxxxxxxxxxx>]

The most robust solution would be to have BlockFoo use smart pointers.

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https://bugs.launchpad.net/bugs/702372

Title:
  BlockMatrix and deleted matrices

Status in DOLFIN:
  New

Bug description:
  The following code crashes, unless "del A" is commented out. I don't
  know the memory handling strategy in dolfin, (boost::shared_ptr is
  used in some places, but not consistently?) but attached is a patch
  which at least removes the crash by making private copies of the
  matrices (and vectors in BlockVectors).

  from dolfin import *

  mesh = UnitSquare(4, 4)
  V = FunctionSpace(mesh, "CG", 1)
  u,v = TrialFunction(V), TestFunction(V)

  a = u*v*dx

  AA = BlockMatrix(1,1)

  A = assemble(a)
  AA[0, 0] = A

  del A

  print AA[0,0]