RenounceToolInputsVisitor.h

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/***********************************************************************************\
* (c) Copyright 1998-2019 CERN for the benefit of the LHCb and ATLAS collaborations *
*                                                                                   *
* This software is distributed under the terms of the Apache version 2 licence,     *
* copied verbatim in the file "LICENSE".                                            *
*                                                                                   *
* In applying this licence, CERN does not waive the privileges and immunities       *
* granted to it by virtue of its status as an Intergovernmental Organization        *
* or submit itself to any jurisdiction.                                             *
\***********************************************************************************/
#pragma once
#include "GaudiKernel/DataObjID.h"
#include "GaudiKernel/ToolVisitor.h"
#include <functional>
#include <string>
#include <type_traits>
#include <vector>
 
#ifndef USAGE_IS_THREAD_SAFE
#  define USAGE_IS_THREAD_SAFE
#endif
 
class IAlgTool;
 
class RenounceToolInputsVisitor {
public:
  struct ILogger {
    virtual ~ILogger()                                                        = default;
    virtual void renounce( std::string_view tool_name, std::string_view key ) = 0;
  };
 
  struct NoLogger : ILogger {
    void renounce( std::string_view, std::string_view ) override {}
  };
 
  class Logger final : public ILogger {
    std::function<void( std::string_view, std::string_view )> m_func;
 
  public:
    template <typename F,
              typename = std::enable_if_t<std::is_invocable_r_v<void, F, std::string_view, std::string_view>>>
    Logger( F func ) : m_func( std::move( func ) ) {}
    void renounce( std::string_view tool_name, std::string_view key ) override { m_func( tool_name, key ); }
  };
  static Logger createLogger( std::function<void( std::string_view, std::string_view )> func ) {
    return Logger{std::move( func )};
  }
 
  RenounceToolInputsVisitor( std::vector<DataObjID> input_keys, ILogger& logger = s_noLogger )
      : m_renounceKeys( std::move( input_keys ) )
      , m_logger( &logger ) // @TODO possible source of use after delete
  {}
 
  void operator()( IAlgTool* );
 
private:
  std::vector<DataObjID> m_renounceKeys;
  ILogger*               m_logger;
 
  static NoLogger s_noLogger USAGE_IS_THREAD_SAFE;
};