On Wed, Jun 2, 2010 at 8:28 AM, Mike Solomon <mike...@ufl.edu> wrote: > I am toying around with a new spanner, and before it prints, I need to > do some calculations on all of its broken_intos_. I can easily do these > calculations in the print function by accessing the broken_into_ of > spanner->original (), but then this calculation is done for each time print > is called, which is N-1 times too many (where N is the length of > broken_into_). The code works just fine, but it is overkill: is there a way > to perform operations on a spanner and its broken_into_'s once before the > print function is called?
Use a property with an attached callback to either hold the computation result. The callback/property infrastructure will make sure it happens only once. What are you trying to calculate? You can also have a look at some of the callbacks that attach to 'positioning-done, see for example the vertical alignment spanners. Since LilyPond is single-threaded, nothing really happens in parallel. -- Han-Wen Nienhuys - han...@xs4all.nl - http://www.xs4all.nl/~hanwen _______________________________________________ lilypond-devel mailing list lilypond-devel@gnu.org http://lists.gnu.org/mailman/listinfo/lilypond-devel
