range-based loop over cells

[Niklas Fehn]

Dear dealii,

when writing

for(auto cell : triangulation){}

which type of cell iterator is used (cell_iterators(), active_cell_iterators())? and where do I find this information in the documentation?

Many thanks and

Best

Niklas

[Bruno Turcksin]

Niklas,

If you want cell_iterators, you write for(auto cell : triangulation.cell_iterators ()) If you want active_cell_iterators, you write for(auto cell : triangulation.active_cell_iterators ()) The documentation is here.

Best,

Bruno

[Niklas Fehn]

thanks. I think it is nevertheless possible to write "cell : triangulation", and I wondered what this means exactly?

[simon...@gmail.com]

You will iterate from begin() to end() on the object after the colon. On Triangulation this is the cells on level 0.

Best,
Simon

[simon...@gmail.com]

No, sorry... All cells. Just starting at level 0. Got confused by this line:

Triangulation< dim, spacedim >::cell_iterator Triangulation< dim, spacedim >::begin ( const unsigned int  level = 0) const

/Simon

[Niklas Fehn]

so this is common C++ knowledge, it is not documented in deal.II?

[Bruno Turcksin]

Niklas,

You can take a look here but basically if a class defines the begin() and end() iterators, you can do a range-based loop. That's just the C++11 standard.

Best,

Bruno

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