Get the size of an index set.

Size (= number of elements) of the set, -1 in case of an error.

The following defines an index set with space for 100 elements and then retrieves its size.

XPRBprob prob;
XPRBidxset iset;
int size;
   ...
iset = XPRBnewidxset(prob, "Set", 100);
size = XPRBgetidxsetsize(iset);

This function returns the current number of elements in an index set. This value does not necessarily correspond to the size specified at the creation of the set. The returned value may be smaller if fewer elements than the originally reserved number have been added, or larger if more elements have been added. (In the latter case, the size of the set is automatically increased.)

XPRBaddidxel, XPRBgetidxsetname, XPRBnewidxset.