Merge branch 'hepmclink' into 'master'

Simplify dummy HepMcEventLinks

See merge request atlas/athena!41011

Generators/GeneratorObjects/GeneratorObjects/CachedParticlePtr.h

 // This file's extension implies that it's C, but it's really -*- C++ -*-.
 /*
- * Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration.
+ * Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration.
  */
 /**
  * @file GeneratorObjects/CachedParticlePtr.h
@@ -106,6 +106,12 @@ public:
   void set (const IProxyDict* sg, const HepMC::GenParticle* part) const;
 
 
+  /**
+   * @brief Check if the cached pointer is valid
+   */
+  bool isValid () const;
+
+
 private:
   /**
    * @brief Convert a store pointer to a void* stored value.

Generators/GeneratorObjects/GeneratorObjects/CachedParticlePtr.icc

 /*
- * Copyright (C) 2002-2019 CERN for the benefit of the ATLAS collaboration.
+ * Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration.
  */
 /**
  * @file GeneratorObjects/CachedParticlePtr.icc
@@ -125,6 +125,16 @@ void CachedParticlePtr::set (const IProxyDict* sg,
 }
 
 
+/**
+ * @brief Check if the cached pointer is valid
+ */
+inline
+bool CachedParticlePtr::isValid () const
+{
+  return m_ptr != nullptr;
+}
+
+
 /**
  * @brief Convert a store pointer to a void* to store.
  * @param sg IProxyDict* to reference.

Generators/GeneratorObjects/GeneratorObjects/HepMcParticleLink.h

@@ -305,7 +305,7 @@ public:
    * @brief Default constructor.  Makes a null link.
    * @param sg Optional specification of a specific store to reference.
    */
-  HepMcParticleLink (IProxyDict* sg = SG::CurrentEventStore::store());
+  HepMcParticleLink (IProxyDict* sg = nullptr);
 
 
   /**

Generators/GeneratorObjects/GeneratorObjects/HepMcParticleLink.icc

@@ -306,7 +306,7 @@ HepMcParticleLink::ExtendedBarCode::setIndex (index_type idx,
  * @param sg Optional specification of a specific store to reference.
  */
 inline
-HepMcParticleLink::HepMcParticleLink (IProxyDict* sg /*= SG::CurrentEventStore::store()*/)
+HepMcParticleLink::HepMcParticleLink (IProxyDict* sg /*= nullptr*/)
   : m_ptrs (sg)
 {
 }

Generators/GeneratorObjects/src/HepMcParticleLink.cxx

@@ -166,6 +166,11 @@ HepMcParticleLink::HepMcParticleLink (const HepMC::GenParticle* part,
  */
 const HepMC::GenParticle* HepMcParticleLink::cptr() const
 {
+  // dummy link
+  if (!m_ptrs.isValid()) {
+    return nullptr;
+  }
+
   const IProxyDict* sg = nullptr;
   auto p = m_ptrs.get (sg);
   if (!p) {
@@ -243,6 +248,11 @@ const HepMC::GenParticle* HepMcParticleLink::cptr() const
  */
 HepMC3::ConstGenParticlePtr HepMcParticleLink::scptr() const
 {
+  // dummy link
+  if (!m_ptrs.isValid()) {
+    return nullptr;
+  }
+
   HepMC3::ConstGenParticlePtr pp{nullptr};
   const IProxyDict* sg = nullptr;
   auto p = m_ptrs.get (sg);
@@ -315,6 +325,11 @@ HepMC3::ConstGenParticlePtr HepMcParticleLink::scptr() const
  */
 HepMcParticleLink::index_type HepMcParticleLink::eventIndex() const
 {
+  // dummy link
+  if (!m_ptrs.isValid()) {
+    return ExtendedBarCode::UNDEFINED;
+  }
+
   index_type index, position;
   m_extBarcode.eventIndex (index, position);
   if (index == ExtendedBarCode::UNDEFINED) {

InnerDetector/InDetSimEvent/src/SiCharge.cxx

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -35,7 +35,7 @@ SiCharge::SiCharge(const double& charge,const double& time,
   m_charge(charge),
   m_time(time),
   m_processType(processType),
-  m_partLink(HepMcParticleLink((unsigned int) 0, 0))
+  m_partLink(HepMcParticleLink())
 {}
 
 

InnerDetector/InDetSimEvent/src/SiTotalCharge.cxx

 /*
-  Copyright (C) 2002-2017 CERN for the benefit of the ATLAS collaboration
+  Copyright (C) 2002-2021 CERN for the benefit of the ATLAS collaboration
 */
 
 ///////////////////////////////////////////////////////////////////
@@ -18,14 +18,14 @@
 SiTotalCharge::SiTotalCharge(const alloc_t& alloc) :
   m_charge(0),
   m_chargeComposition(alloc),
-  m_emptyLink((unsigned int) 0, 0)
+  m_emptyLink()
 {}
 
 // Copy constructor:
 SiTotalCharge::SiTotalCharge(const SiTotalCharge &totalCharge) :
   m_charge(totalCharge.m_charge),
   m_chargeComposition(totalCharge.m_chargeComposition),
-  m_emptyLink((unsigned int) 0, 0)
+  m_emptyLink()
 {}
 
 // Assignment operator: