/usr/include/ThePEG/Utilities/AnyReference.h is in libthepeg-dev 1.8.0-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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//
// AnyReference.h is a part of ThePEG - Toolkit for HEP Event Generation
// Copyright (C) 1999-2007 Leif Lonnblad
// Copyright (C) 2010-2011 Simon Platzer
//
// ThePEG is licenced under version 2 of the GPL, see COPYING for details.
// Please respect the MCnet academic guidelines, see GUIDELINES for details.
//
#ifndef ThePEG_AnyReference_H
#define ThePEG_AnyReference_H
#include "ThePEG/Config/ThePEG.h"
#include "Exception.h"
namespace ThePEG {
/**
* AnyReference is inspired by boost::any to hold a reference to an
* object of arbitrary type.
*/
class AnyReference {
struct ReferenceHolderBase {
/**
* The destructor.
*/
virtual ~ReferenceHolderBase() {}
/**
* Return the type held.
*/
virtual const std::type_info& type() const = 0;
/**
* Clone this reference holder.
*/
virtual ReferenceHolderBase* clone() const = 0;
};
template<class T>
struct ReferenceHolder
: public ReferenceHolderBase {
/**
* The reference held.
*/
T& value;
/**
* Static member to initialize the reference.
*/
static T& init() {
static T v; return v;
}
/**
* The default constructor
*/
ReferenceHolder()
: value(init()) {}
/**
* Construct from given reference.
*/
explicit ReferenceHolder(T& v)
: value(v) {}
/**
* Return the type held.
*/
virtual const std::type_info& type() const {
return typeid(T);
}
/**
* Clone this reference holder.
*/
virtual ReferenceHolderBase* clone() const {
return new ReferenceHolder(*this);
}
};
/**
* The reference holder used.
*/
ReferenceHolderBase* holder;
public:
/**
* The default constructor
*/
AnyReference()
: holder(0) {}
/**
* The standard constructor
*/
template<class T>
AnyReference(T& v)
: holder(new ReferenceHolder<T>(v)) {}
/**
* The copy constructor
*/
AnyReference(const AnyReference& other)
: holder(other.holder ? other.holder->clone() : 0) {}
/**
* The destructor.
*/
~AnyReference() {
if ( holder ) {
delete holder; holder = 0;
}
}
public:
/**
* Return the type held.
*/
const std::type_info& type() const { return holder ? holder->type() : typeid(void); }
/**
* Return true, if no reference is held.
*/
bool empty() const { return !holder; }
public:
/**
* Swap the references held.
*/
AnyReference& swap(AnyReference& other) {
std::swap(holder,other.holder); return *this;
}
/**
* Assign from definite type
*/
template<class T>
AnyReference& operator=(T& v) {
AnyReference(v).swap(*this);
return *this;
}
/**
* Assign from AnyReference
*/
AnyReference& operator=(AnyReference other) {
other.swap(*this);
return *this;
}
/**
* Reset to not keep track of any reference.
*/
void reset() {
if ( holder ) delete holder; holder = 0;
}
public:
/**
* Extract the held reference.
*/
template<class T>
T& cast() const {
if ( !empty() && type() == typeid(T) ) {
return static_cast<ReferenceHolder<T>*>(holder)->value;
}
throw Exception() << "Bad cast in AnyReference" << Exception::abortnow;
return ReferenceHolder<T>::init();
}
};
}
#endif // ThePEG_AnyReference_H
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