Merge pull request #293 from gtjusila/event_handler

Small Bug Fix TO Eventhandler

Author: matbesancon

src/event_handler.jl

@@ -69,7 +69,7 @@ function include_event_handler(
     eventhdlr = pointer_from_objref(event_handler)
 
     if name == ""
-        name = "__eventhdlr__$(length(eventhdlrs))"
+        name = "__eventhdlr__$(length(scipd.eventhdlrs))"
     end
 
     @SCIP_CALL SCIPincludeEventhdlrBasic(

test/eventhdlr.jl

@@ -79,3 +79,60 @@ end
     # free the problem
     finalize(inner)
 end
+
+@testset "Nameless Event handler" begin
+    # create an empty problem
+    optimizer = SCIP.Optimizer()
+    inner = optimizer.inner
+    sepa_set_scip_parameters((par, val) -> SCIP.set_parameter(inner, par, val))
+
+    # add variables
+    x, y = MOI.add_variables(optimizer, 2)
+    MOI.add_constraint(optimizer, x, MOI.ZeroOne())
+    MOI.add_constraint(optimizer, y, MOI.ZeroOne())
+
+    # add constraint: x + y ≤ 1.5
+    MOI.add_constraint(
+        optimizer,
+        MOI.ScalarAffineFunction(
+            MOI.ScalarAffineTerm.([1.0, 1.0], [x, y]),
+            0.0,
+        ),
+        MOI.LessThan(1.5),
+    )
+
+    # minimize -x - y
+    MOI.set(
+        optimizer,
+        MOI.ObjectiveFunction{MOI.ScalarAffineFunction{Float64}}(),
+        MOI.ScalarAffineFunction(
+            MOI.ScalarAffineTerm.([-1.0, -1.0], [x, y]),
+            0.0,
+        ),
+    )
+    MOI.set(optimizer, MOI.ObjectiveSense(), MOI.MIN_SENSE)
+
+    # add eventhandler 
+    eventhdlr = FirstLPEventTest.FirstLPEvent(inner, 10)
+    SCIP.include_event_handler(
+        inner,
+        eventhdlr;
+        name="firstlp",
+        desc="Store the objective value of the first LP solve at the root node",
+    )
+
+    # transform the problem into SCIP
+    SCIP.@SCIP_CALL SCIP.SCIPtransformProb(inner)
+
+    # catch the event. Again this can only be done after the problem is transformed
+    SCIP.catch_event(inner, SCIP.SCIP_EVENTTYPE_FIRSTLPSOLVED, eventhdlr)
+
+    # solve the problem
+    SCIP.@SCIP_CALL SCIP.SCIPsolve(inner.scip[])
+
+    # test if the event handler worked 
+    @test eventhdlr.firstlpobj != 10
+
+    # free the problem
+    finalize(inner)
+end