[clib] Reintroduce no-op destructor methods

include/cantera/clib/ct.h

@@ -39,6 +39,7 @@ extern "C" {
 
     CANTERA_CAPI int thermo_parent(int n);
     CANTERA_CAPI int thermo_size();
+    CANTERA_CAPI int thermo_del(int n);  //!< no-op; object is managed by Solution
     CANTERA_CAPI size_t thermo_nElements(int n);
     CANTERA_CAPI size_t thermo_nSpecies(int n);
     CANTERA_CAPI double thermo_temperature(int n);
@@ -131,6 +132,7 @@ extern "C" {
     CANTERA_CAPI int thermo_setState_Tsat(int n, double t, double x);
 
     CANTERA_CAPI int kin_parent(int n);
+    CANTERA_CAPI int kin_del(int n);  //!< no-op; object is managed by Solution
     CANTERA_CAPI size_t kin_nSpecies(int n);
     CANTERA_CAPI size_t kin_nReactions(int n);
     CANTERA_CAPI size_t kin_nPhases(int n);
@@ -163,6 +165,7 @@ extern "C" {
     CANTERA_CAPI size_t kin_phase(int n, size_t i);
 
     CANTERA_CAPI int trans_parent(int n);
+    CANTERA_CAPI int trans_del(int n);  //!< no-op; object is managed by Solution
     CANTERA_CAPI int trans_transportModel(int n, int lennm, char* nm);
     CANTERA_CAPI double trans_viscosity(int n);
     CANTERA_CAPI double trans_electricalConductivity(int n);

interfaces/sourcegen/sourcegen/csharp/config.yaml

@@ -44,9 +44,6 @@ class_accessors:
 #  Derived: Base
 derived_handles:
   SurfaceHandle: ThermoPhaseHandle
-  ThermoPhaseHandle: SolutionHandle
-  KineticsHandle: SolutionHandle
-  TransportHandle: SolutionHandle
 
 # Provides info for scaffolding higher-level idiomatic C# classes
 # At this stage, we can scaffold simple properties that follow the

src/clib/ct.cpp

@@ -1754,4 +1754,25 @@ extern "C" {
             return handleAllExceptions(-2, ERR);
         }
     }
+
+    int thermo_del(int n)
+    {
+        // function is needed for sourcegen
+        // no-op: object is managed by Solution
+        return 0;
+    }
+
+    int kin_del(int n)
+    {
+        // function is needed for sourcegen
+        // no-op: object is managed by Solution
+        return 0;
+    }
+
+    int trans_del(int n)
+    {
+        // function is needed for sourcegen
+        // no-op: object is managed by Solution
+        return 0;
+    }
 }