dolfin team mailing list archive

[Anders Logg <logg@xxxxxxxxx>]

On Tue, Sep 13, 2011 at 02:56:59PM +0100, Garth N. Wells wrote:
> On 13 September 2011 14:47, Anders Logg <logg@xxxxxxxxx> wrote:
> > On Tue, Sep 13, 2011 at 02:40:04PM +0100, Garth N. Wells wrote:
> >> On 13 September 2011 14:31, Anders Logg <logg@xxxxxxxxx> wrote:
> >> > Why was this changed? I thought we had agreed that (in C++), functions
> >> > that return data should be
> >> >
> >> >  [const] Foo& foo() [const];
> >> >
> >> > and in addition we offer
> >> >
> >> >  boost::shared_ptr<[const] Foo> foo_shared_ptr() [const];
> >> >
> >>
> >> I thought that we agreed to use a single function in place of two for
> >> low-level library functions to:
> >>
> >>  - reduce the amount of code
> >>  - avoid possible memory errors
> >>  - avoid the need to ignore functions in the swig interface (which has
> >> been a source of bugs).
> >
> > Agree, in all places except a few that are most often exposed to
> > users.
> >
> >> I advocate the shared_ptr interface over extra work and complicated
> >> memory issues. I don't see an advantage to a reference version in
> >> parts of the code that only advanced users will see.
> >
> > Me neither, but isn't FunctionSpace::mesh() one of the more basic
> > calls that many users will see, like Function::vector(),
> > Function::function_space() and the like?
> >
>
> Keeping a reference version for Function::vector() I agree with. I
> don't believe that many users are exposed to FunctionSpace::mesh(). In
> simple usage cases the user has the original mesh that was used to
> create a FunctionSpace in scope and readily accessible. If they don't
> have it in scope, then they're in trouble anyway with the simple
> interface because the FunctionSpace will have a dangling pointer to a
> Mesh.
>
> FunctionSpace::mesh(), unlike Function::vector(), is not exposed in
> any of the C++ demos.

ok, that's a good check.

--
Anders


> Garth
>
> >
> >
> >> Garth
> >>
> >> > And in the Python interface, we ignore foo and map foo_shared_ptr to
> >> > foo.
> >> >
> >> > Accessing the mesh is very handy from C++ and this change will force
> >> > users of the C++ interface to use shared pointers which I think
> >> > should be optional.
> >> >
> >> >
> >> >
> >> > ---------- Forwarded message ----------
> >> > From: noreply@xxxxxxxxxxxxx
> >> > To: Anders Logg <logg@xxxxxxxxx>
> >> > Date: Tue, 13 Sep 2011 12:05:16 -0000
> >> > Subject: [Branch ~dolfin-core/dolfin/main] Rev 6190: Return shared_ptr for Mesh from FunctionSpace and regenerate form files.
> >> > ------------------------------------------------------------
> >> > revno: 6190
> >> > committer: Garth N. Wells <gnw20@xxxxxxxxx>
> >> > branch nick: dolfin-main
> >> > timestamp: Tue 2011-09-13 12:34:53 +0100
> >> > message:
> >> >  Return shared_ptr for Mesh from FunctionSpace and regenerate form files.
> >> > modified:
> >> >  bench/fem/assembly/cpp/forms/Elasticity3D.h
> >> >  bench/fem/assembly/cpp/forms/NSEMomentum3D.h
> >> >  bench/fem/assembly/cpp/forms/Poisson2DP1.h
> >> >  bench/fem/assembly/cpp/forms/Poisson2DP2.h
> >> >  bench/fem/assembly/cpp/forms/Poisson2DP3.h
> >> >  bench/fem/assembly/cpp/forms/StabStokes2D.h
> >> >  bench/fem/assembly/cpp/forms/THStokes2D.h
> >> >  bench/fem/convergence/cpp/forms/Poisson2D_1.h
> >> >  bench/fem/convergence/cpp/forms/Poisson2D_2.h
> >> >  bench/fem/convergence/cpp/forms/Poisson2D_3.h
> >> >  bench/fem/convergence/cpp/forms/Poisson2D_4.h
> >> >  bench/fem/convergence/cpp/forms/Poisson2D_5.h
> >> >  bench/fem/convergence/cpp/forms/Poisson3D_1.h
> >> >  bench/fem/convergence/cpp/forms/Poisson3D_2.h
> >> >  bench/fem/convergence/cpp/forms/Poisson3D_3.h
> >> >  bench/fem/convergence/cpp/forms/Poisson3D_4.h
> >> >  bench/fem/convergence/cpp/forms/Poisson3D_5.h
> >> >  bench/fem/multicore/cpp/NavierStokes.h
> >> >  bench/fem/multicore/cpp/Poisson.h
> >> >  bench/fem/speedup/cpp/Poisson.h
> >> >  bench/function/evaluation/cpp/P1.h
> >> >  demo/la/eigenvalue/cpp/StiffnessMatrix.h
> >> >  demo/pde/biharmonic/cpp/Biharmonic.h
> >> >  demo/pde/cahn-hilliard/cpp/CahnHilliard2D.cpp
> >> >  demo/pde/cahn-hilliard/cpp/CahnHilliard2D.h
> >> >  demo/pde/cahn-hilliard/cpp/CahnHilliard3D.cpp
> >> >  demo/pde/cahn-hilliard/cpp/CahnHilliard3D.h
> >> >  demo/pde/hyperelasticity/cpp/HyperElasticity.h
> >> >  demo/pde/mixed-poisson/cpp/MixedPoisson.h
> >> >  demo/pde/navier-stokes/cpp/PressureUpdate.h
> >> >  demo/pde/navier-stokes/cpp/TentativeVelocity.h
> >> >  demo/pde/navier-stokes/cpp/VelocityUpdate.h
> >> >  demo/pde/poisson/cpp/Poisson.h
> >> >  demo/pde/stokes-iterative/cpp/Stokes.h
> >> >  demo/pde/stokes-iterative/cpp/StokesPreconditioner.h
> >> >  demo/undocumented/advection-diffusion/cpp/AdvectionDiffusion.h
> >> >  demo/undocumented/advection-diffusion/cpp/Velocity.h
> >> >  demo/undocumented/assembly/cpp/ReactionDiffusion.h
> >> >  demo/undocumented/auto-adaptive-navier-stokes/cpp/AdaptiveNavierStokes.h
> >> >  demo/undocumented/auto-adaptive-poisson/cpp/AdaptivePoisson.h
> >> >  demo/undocumented/bcs/cpp/Poisson.h
> >> >  demo/undocumented/block-matrix/cpp/StiffnessMatrix.h
> >> >  demo/undocumented/conditional/cpp/Conditional.h
> >> >  demo/undocumented/curl-curl/cpp/CurrentDensity.h
> >> >  demo/undocumented/curl-curl/cpp/EddyCurrents.h
> >> >  demo/undocumented/dg-advection-diffusion/cpp/AdvectionDiffusion.h
> >> >  demo/undocumented/dg-advection-diffusion/cpp/Projection.h
> >> >  demo/undocumented/dg-advection-diffusion/cpp/Velocity.h
> >> >  demo/undocumented/dg-poisson/cpp/Poisson.h
> >> >  demo/undocumented/elasticity/cpp/Elasticity.h
> >> >  demo/undocumented/elastodynamics/cpp/DG0_eps_xx.h
> >> >  demo/undocumented/elastodynamics/cpp/ElastoDynamics.h
> >> >  demo/undocumented/eval/cpp/Projection.h
> >> >  demo/undocumented/extrapolation/cpp/P1.h
> >> >  demo/undocumented/extrapolation/cpp/P2.h
> >> >  demo/undocumented/functional/cpp/EnergyNorm.h
> >> >  demo/undocumented/lift-drag/cpp/Drag.h
> >> >  demo/undocumented/lift-drag/cpp/Lift.h
> >> >  demo/undocumented/lift-drag/cpp/Pressure.h
> >> >  demo/undocumented/neumann-poisson/cpp/Poisson.h
> >> >  demo/undocumented/nonlinear-poisson/cpp/NonlinearPoisson.h
> >> >  demo/undocumented/nonmatching-interpolation/cpp/P1.h
> >> >  demo/undocumented/nonmatching-interpolation/cpp/P3.h
> >> >  demo/undocumented/nonmatching-projection/cpp/P1_projection.h
> >> >  demo/undocumented/nonmatching-projection/cpp/P3.h
> >> >  demo/undocumented/periodic/cpp/Poisson.h
> >> >  demo/undocumented/poisson1D/cpp/Poisson.h
> >> >  demo/undocumented/reaction-diffusion/cpp/ReactionDiffusion.h
> >> >  demo/undocumented/simple/cpp/MassMatrix3D.h
> >> >  demo/undocumented/simple/cpp/StiffnessMatrix3D.h
> >> >  demo/undocumented/spatial-coordinates/cpp/SpatialCoordinates.h
> >> >  demo/undocumented/stokes-stabilized/cpp/Stokes.h
> >> >  demo/undocumented/stokes-taylor-hood/cpp/Stokes.h
> >> >  demo/undocumented/sym-dirichlet-bc/cpp/Poisson.h
> >> >  demo/undocumented/waveguide/cpp/Forms.h
> >> >  dolfin/adaptivity/ErrorControl.cpp
> >> >  dolfin/adaptivity/Extrapolation.cpp
> >> >  dolfin/adaptivity/GenericAdaptiveVariationalSolver.cpp
> >> >  dolfin/adaptivity/adapt.cpp
> >> >  dolfin/ale/Poisson1D.h
> >> >  dolfin/ale/Poisson2D.h
> >> >  dolfin/ale/Poisson3D.h
> >> >  dolfin/fem/BoundaryCondition.cpp
> >> >  dolfin/fem/DirichletBC.cpp
> >> >  dolfin/fem/Form.cpp
> >> >  dolfin/fem/PeriodicBC.cpp
> >> >  dolfin/fem/PointSource.cpp
> >> >  dolfin/function/Function.cpp
> >> >  dolfin/function/FunctionSpace.cpp
> >> >  dolfin/function/FunctionSpace.h
> >> >  dolfin/function/SubSpace.cpp
> >> >  dolfin/io/RAWFile.cpp
> >> >  dolfin/io/VTKFile.cpp
> >> >  dolfin/io/VTKWriter.cpp
> >> >  dolfin/io/XYZFile.cpp
> >> >  dolfin/plot/plot.cpp
> >> >  site-packages/dolfin_utils/wrappers/goalfunctional.py
> >> >  test/unit/function/cpp/Projection.h
> >> > The size of the diff (167257 lines) is larger than your specified limit of 1000 lines
> >> >
> >> >
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> >> >
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> >> >
> >