/usr/include/ThePEG/Utilities/AnyReference.h is in libthepeg-dev 1.8.0-1.1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 | // -*- C++ -*-
//
// 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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