DOLFIN User Manual - FEniCS Project

DOLFIN User ManualHoffman, Jansson, Logg, Wellsvoid dolfin_begin(const char* message, ...);void dolfin_end(const char* message, ...);These functions enable the DOLFIN log system to display messages, warningsand errors hierarchically, by automatically indenting the output producedbetween calls to dolfin begin() and dolfin end(). A program maycontain an arbitrary number of nested tasks.10.5 Progress barsThe DOLFIN log system provides the class Progress for simple creation ofprogress sessions. A progress session automatically displays the progress ofa computation using a progress bar.If the number of steps of a computation is known, a progress session shouldbe defined in terms of the number of steps and updated in each step of thecomputation as illustrated by the following example:Progress p(‘‘Assembling’’, mesh.noCells());for (CellIterator c(mesh); !c.end(); ++c){...p++;}It is also possible to specify the step number explicitly by assigning an integerto the progress session:Progress p(‘‘Iterating over vector’’, x.size())for (uint i = 0; i < x.size(); i++){...69