Prefer not to include interfaces from one to another as such, factor out the part that is needed

Former-commit-id: b0dd5104

Tracking/TrkExtrapolation/TrkExInterfaces/TrkExInterfaces/HelperStructs.h

+/*
+   Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
+ */
+
+#ifndef TRKEXINTERFACES_HELPERSTRUCTS_H
+#define TRKEXINTERFACES_HELPERSTRUCTS_H
+namespace Trk {
+
+struct HitInfo 
+{
+  const Trk::TrackParameters*  trackParms;    // intersection
+  float time;       // timing  
+  int   detID;      // sensitive detector id
+  float deposit;    // interaction energy deposit (secondaries subtracted)   
+
+  /**
+   * Constructor
+   */
+  HitInfo( const Trk::TrackParameters* parms, float time, int id, float deposit ) :
+    trackParms(parms), time(time), detID(id), deposit(deposit) 
+  {} 
+};
+
+struct PathLimit 
+{
+  float x0Max;       // path limit after which sampled process occurs
+  float x0Collected; // x0 traversed so far
+  float l0Collected; // l0 traversed so far
+  float weightedZ;   // type of material traversed (divide by collected x0 to get average Z)
+  int   process;     // type of pre-sampled material process
+
+  /**
+   * Constructor
+   */
+  PathLimit( float pathLimit, int proc) :
+    x0Max(pathLimit), x0Collected(0.0), l0Collected(0.0),weightedZ(0.0), process(proc)
+  {} 
+
+  /**
+   * collected material update
+   */
+  void updateMat( float dX0, float Z, float dL0) { 
+    x0Collected += dX0; weightedZ += dX0*Z; 
+    l0Collected += dL0>0. ? dL0 : dX0/0.37/Z;     // use approximation if l0 not available
+  }
+};
+
+struct TimeLimit 
+{
+  float tMax;       // pre-sampled life-time
+  float time;       // timing  
+  int   process;    // type of pre-sampled decay process
+
+  /**
+   * Constructor
+   */
+  TimeLimit( float timeMax, float time, int proc) :
+    tMax(timeMax), time(time), process(proc)
+  {} 
+
+  /**
+   * timing update
+   */
+  void updateTime( float dt) { time += dt; }
+};
+}
+
+#endif

Tracking/TrkExtrapolation/TrkExInterfaces/TrkExInterfaces/IPropagator.h

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -17,11 +17,10 @@
 #include "TrkParameters/TrackParameters.h"
 #include "TrkNeutralParameters/NeutralParameters.h"
 #include "TrkSurfaces/BoundaryCheck.h"
-#include "ITimedExtrapolator.h"
 #include "TrkExUtils/TrackSurfaceIntersection.h"
 #include "TrkExUtils/ExtrapolationCache.h"
 #include "TrkExUtils/TargetSurfaces.h"
-
+#include "HelperStructs.h"
 // STL
 #include <utility>
 

Tracking/TrkExtrapolation/TrkExInterfaces/TrkExInterfaces/ITimedExtrapolator.h

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -17,67 +17,10 @@
 #include "TrkParameters/TrackParameters.h"
 #include "TrkExUtils/MaterialUpdateMode.h"
 #include "TrkDetDescrUtils/GeometrySignature.h"
+#include "HelperStructs.h"
 #include <utility>
  
 namespace Trk {
-
-  struct HitInfo 
-  {
-    const Trk::TrackParameters*  trackParms;    // intersection
-    float time;       // timing  
-    int   detID;      // sensitive detector id
-    float deposit;    // interaction energy deposit (secondaries subtracted)   
-
-    /**
-     * Constructor
-     */
-    HitInfo( const Trk::TrackParameters* parms, float time, int id, float deposit ) :
-    trackParms(parms), time(time), detID(id), deposit(deposit) 
-    {} 
-  };
-
-  struct PathLimit 
-  {
-    float x0Max;       // path limit after which sampled process occurs
-    float x0Collected; // x0 traversed so far
-    float l0Collected; // l0 traversed so far
-    float weightedZ;   // type of material traversed (divide by collected x0 to get average Z)
-    int   process;     // type of pre-sampled material process
-
-    /**
-     * Constructor
-     */
-    PathLimit( float pathLimit, int proc) :
-      x0Max(pathLimit), x0Collected(0.0), l0Collected(0.0),weightedZ(0.0), process(proc)
-    {} 
-
-    /**
-     * collected material update
-     */
-    void updateMat( float dX0, float Z, float dL0) { 
-      x0Collected += dX0; weightedZ += dX0*Z; 
-      l0Collected += dL0>0. ? dL0 : dX0/0.37/Z;     // use approximation if l0 not available
-    }
-  };
-  
-  struct TimeLimit 
-  {
-    float tMax;       // pre-sampled life-time
-    float time;       // timing  
-    int   process;    // type of pre-sampled decay process
-
-    /**
-     * Constructor
-     */
-    TimeLimit( float timeMax, float time, int proc) :
-      tMax(timeMax), time(time), process(proc)
-    {} 
-
-    /**
-     * timing update
-     */
-    void updateTime( float dt) { time += dt; }
-  };
   
   static const InterfaceID IID_ITimedExtrapolator("ITimedExtrapolator", 1, 0);
   

Tracking/TrkExtrapolation/TrkExInterfaces/TrkExInterfaces/ITimedMatEffUpdator.h

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2018 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -17,7 +17,7 @@
 #include "TrkExUtils/MaterialUpdateMode.h"
 #include "TrkParameters/TrackParameters.h"
 #include "TrkDetDescrUtils/GeometrySignature.h"
-#include "ITimedExtrapolator.h"
+#include "HelperStructs.h"
 
 namespace Trk {