TVirtualEvent.icc

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// Dear emacs, this is -*- c++ -*-
//
// Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
//
#ifndef XAODROOTACCESSINTERFACES_TVIRTUALEVENT_ICC
#define XAODROOTACCESSINTERFACES_TVIRTUALEVENT_ICC
 
// ROOT include(s):
#include <TError.h>
 
namespace xAOD {
 
   /// This is the function used by all the smart pointers to get access
   /// to objects in the event.
   ///
   /// @param obj    The pointer that should be set [output]
   /// @param key    The hashed key of the object to retrieve
   /// @param silent When set to <code>true</code>, failure is handled silently
   /// @returns <code>true</code> if the operation was successful,
   ///          <code>false</code> otherwise
   ///
   template< typename T >
   bool TVirtualEvent::retrieve( const T*& obj, sgkey_t key, bool silent ) {
 
      // Look among the output objects first:
      const void* result = getOutputObject( key, typeid( T ) );
      // Check if it succeeded:
      if( ! result ) {
         // Try the input then:
         result = getInputObject( key, typeid( T ), silent );
         if( ! result ) {
            if( ! silent ) {
               ::Warning( "xAOD::TVirtualEvent::retrieve",
                          "Couldn't retrieve %s/0x%08x",
                          typeid( T ).name(), key );
            }
            return false;
         }
      }
 
      // If we were successful:
      obj = reinterpret_cast< const T* >( result );
      return true;
   }
 
   /// This is a convenience function for human users for getting access to
   /// an existing object, using a string key instead of a hashed identifier.
   ///
   /// Internally it just creates a hash from the key, and perform the retrieve
   /// with that.
   ///
   /// @param obj The pointer that should be set [output]
   /// @param key The key of the object to retrieve
   /// @returns <code>true</code> if the operation was successful,
   ///          <code>false</code> otherwise
   ///
   template< typename T >
   bool TVirtualEvent::retrieve( const T*& obj, const std::string& key,
                                 bool silent ) {
 
      return retrieve( obj, getHash( key ), silent );
   }
 
} // namespace xAOD
 
#endif // XAODROOTACCESSINTERFACES_TVIRTUALEVENT_ICC