|igraph Reference Manual|
There are some simple rules to keep in order to have functions
behaving well in erroneous situations. First, check the arguments
of the functions and call
IGRAPH_ERROR if they are invalid. Second,
IGRAPH_FINALLY on each dynamically allocated object and call
IGRAPH_FINALLY_CLEAN() with the proper argument before returning. Third, use
IGRAPH_CHECK on all igraph function calls which can generate errors.
The size of the stack used for this bookkeeping is fixed, and
small. If you want to allocate several objects, write a destroy
function which can deallocate all of these. See the
adjlist.c file in the
igraph source for an example.
For some functions these mechanisms are simply not flexible enough. These functions should define their own error handlers and restore the error handler before they return.
|<< 4.3. Deallocating memory||4.5. Error handling and threads >>|