RooArgSet.h

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/*****************************************************************************
 * Project: RooFit                                                           *
 * Package: RooFitCore                                                       *
 *    File: $Id: RooArgSet.h,v 1.45 2007/08/09 19:55:47 wouter Exp $
 * Authors:                                                                  *
 *   WV, Wouter Verkerke, UC Santa Barbara, verkerke@slac.stanford.edu       *
 *   DK, David Kirkby,    UC Irvine,         dkirkby@uci.edu                 *
 *                                                                           *
 * Copyright (c) 2000-2005, Regents of the University of California          *
 *                          and Stanford University. All rights reserved.    *
 *                                                                           *
 * Redistribution and use in source and binary forms,                        *
 * with or without modification, are permitted according to the terms        *
 * listed in LICENSE (http://roofit.sourceforge.net/license.txt)             *
 *****************************************************************************/
#ifndef ROO_ARG_SET
#define ROO_ARG_SET
 
#include "RooAbsCollection.h"
#include "RooAbsArg.h"
 
class RooArgList ;
 
// Use a memory pool for RooArgSet.
// RooFit assumes (e.g. for caching results) that arg sets that have the same pointer have
// the same contents. Trying to remove that memory pool lead to wrong results, because the
// OS *occasionally* returns the same address, and the caching goes wrong.
// It's hard to track down, so disable this only when e.g. looking for memory leaks!
#define USEMEMPOOLFORARGSET
template <class RooSet_t, size_t>
class MemPoolForRooSets;
 
class RooArgSet : public RooAbsCollection {
public:
  
#ifdef USEMEMPOOLFORARGSET
  void* operator new (size_t bytes);
  void* operator new (size_t bytes, void* ptr) noexcept;
  void operator delete (void *ptr);
#endif
 
  // Constructors, assignment etc.
  RooArgSet();
 
  /// Construct a (non-owning) RooArgSet from one or more
  /// RooFit objects. The set will not own its contents.
  /// \tparam Ts Parameter pack of objects that derive from RooAbsArg or RooFit collections; or a name.
  /// \param arg A RooFit object.
  /// \param moreArgsOrName Arbitrary number of
  /// - Further RooFit objects that derive from RooAbsArg
  /// - RooFit collections of such objects
  /// - A name for the set. Given multiple names, the last-given name prevails.
  template<typename... Ts>
  RooArgSet(const RooAbsArg& arg, const Ts&... moreArgsOrName) {
    add(arg);
    // Expand parameter pack in C++ 11 way:
    int dummy[] = { 0, (processArg(moreArgsOrName), 0) ... };
    (void)dummy;
  }
 
  /// Construct a (non-owning) RooArgSet from iterators.
  /// \tparam Iterator_t An iterator pointing to RooFit objects or to pointers/references of those.
  /// \param beginIt Iterator to first element to add.
  /// \param endIt Iterator to end of range to be added.
  /// \param name Optional name of the collection.
  template<typename Iterator_t,
      typename value_type = typename std::remove_pointer<typename std::iterator_traits<Iterator_t>::value_type>::type,
      typename = std::enable_if<std::is_convertible<const value_type*, const RooAbsArg*>::value> >
  RooArgSet(Iterator_t beginIt, Iterator_t endIt, const char* name="") :
  RooArgSet(name) {
    for (auto it = beginIt; it != endIt; ++it) {
      processArg(*it);
    }
  }
 
  RooArgSet(const RooArgSet& other, const char *name="");
  /// Move constructor.
  RooArgSet(RooArgSet && other) : RooAbsCollection(std::move(other)) {}
 
  RooArgSet(const RooArgSet& set1, const RooArgSet& set2,
            const char *name="");
 
  RooArgSet(const RooArgList& list) ;
  RooArgSet(const RooAbsCollection& collection, const RooAbsArg* var1);
  explicit RooArgSet(const TCollection& tcoll, const char* name="") ;
  explicit RooArgSet(const char *name);
 
  ~RooArgSet() override;
  TObject* clone(const char* newname) const override { return new RooArgSet(*this,newname); }
  TObject* create(const char* newname) const override { return new RooArgSet(newname); }
  RooArgSet& operator=(const RooArgSet& other) { RooAbsCollection::operator=(other) ; return *this ;}
 
  using RooAbsCollection::operator[];
  RooAbsArg& operator[](const TString& str) const;
 
 
  /// Shortcut for readFromStream(std::istream&, Bool_t, const char*, const char*, Bool_t), setting
  /// `flagReadAtt` and `section` to 0.
  virtual bool readFromStream(std::istream& is, bool compact, bool verbose=false) {
    // I/O streaming interface (machine readable)
    return readFromStream(is, compact, 0, 0, verbose) ;
  }
  Bool_t readFromStream(std::istream& is, Bool_t compact, const char* flagReadAtt, const char* section, Bool_t verbose=kFALSE) ;
  virtual void writeToStream(std::ostream& os, bool compact, const char* section=0) const;
  void writeToFile(const char* fileName) const ;
  Bool_t readFromFile(const char* fileName, const char* flagReadAtt=0, const char* section=0, Bool_t verbose=kFALSE) ;
 
 
 
  static void cleanup() ;
 
  Bool_t isInRange(const char* rangeSpec) ;
 
  /// Use RooAbsCollection::snapshot(), but return as RooArgSet.
  RooArgSet * snapshot(bool deepCopy = true) const {
    return static_cast<RooArgSet*>(RooAbsCollection::snapshot(deepCopy));
  }
 
  /// \copydoc RooAbsCollection::snapshot()
  Bool_t snapshot(RooAbsCollection& output, Bool_t deepCopy=kTRUE) const {
    return RooAbsCollection::snapshot(output, deepCopy);
  }
 
protected:
  Bool_t checkForDup(const RooAbsArg& arg, Bool_t silent) const ;
  virtual bool canBeAdded(const RooAbsArg& arg, bool silent) const override {
    return !checkForDup(arg, silent);
  }
 
private:
  void processArg(const RooAbsArg& var) { add(var); }
  void processArg(const RooAbsArg* var) { add(*var); }
  void processArg(const RooArgSet& set) { add(set); if (_name.Length() == 0) _name = set.GetName(); }
  void processArg(const RooArgList& list);
  void processArg(const char* name) { _name = name; }
 
#ifdef USEMEMPOOLFORARGSET
private:
  typedef MemPoolForRooSets<RooArgSet, 10*600> MemPool; //600 = about 100 kb
  //Initialise a static mem pool. It has to happen inside a function to solve the
  //static initialisation order fiasco. At the end of the program, this might have
  //to leak depending if RooArgSets are still alive. This depends on the order of destructions.
  static MemPool* memPool();
#endif
  
  ClassDefOverride(RooArgSet,1) // Set of RooAbsArg objects
};
 
#endif