Merge pull request #818 from SciML/ChrisRackauckas-patch-2

Update integrator_interface.jl with new interface information

src/integrator_interface.jl

@@ -321,18 +321,29 @@ end
 addsteps!(i::DEIntegrator, args...) = nothing
 
 """
-    reeval_internals_due_to_modification!(integrator::DEIntegrator, continuous_modification=true)
+    reeval_internals_due_to_modification!(integrator::DEIntegrator, continuous_modification::Bool=true;
+                                          callback_initializealg = nothing)
 
 Update DE integrator after changes by callbacks.
 For DAEs (either implicit or semi-explicit), this requires re-solving alebraic variables.
 If continuous_modification is true (or unspecified), this should also recalculate interpolation data.
 Otherwise the integrator is allowed to skip recalculating the interpolation.
+
+# Arguments
+
+- `continuous_modification`: determines whether the modification is due to a continuous change (continuous callback)
+  or a discrete callback. For a continuous change, this can include a change to time which requires a re-evaluation
+  of the interpolations.
+- `callback_initializealg`: the initialization algorithm provided by the callback. For DAEs, this is the choice for the
+  initialization that is done post callback. The default value of `nothing` means that the initialization choice
+  used for the DAE should be performed post-callback.
 """
 function reeval_internals_due_to_modification!(
-        integrator::DEIntegrator, continuous_modification)
+        integrator::DEIntegrator, continuous_modification::Bool;
+        callback_initializealg = nothing)
     reeval_internals_due_to_modification!(integrator::DEIntegrator)
 end
-reeval_internals_due_to_modification!(integrator::DEIntegrator) = nothing
+reeval_internals_due_to_modification!(integrator::DEIntegrator; callback_initializealg = nothing) = nothing
 
 """
     set_t!(integrator::DEIntegrator, t)