/usr/include/ql/patterns/singleton.hpp is in libquantlib0-dev 1.7.1-1.
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 | /* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/*
Copyright (C) 2004, 2005, 2007 StatPro Italia srl
This file is part of QuantLib, a free-software/open-source library
for financial quantitative analysts and developers - http://quantlib.org/
QuantLib is free software: you can redistribute it and/or modify it
under the terms of the QuantLib license. You should have received a
copy of the license along with this program; if not, please email
<quantlib-dev@lists.sf.net>. The license is also available online at
<http://quantlib.org/license.shtml>.
This program is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
FOR A PARTICULAR PURPOSE. See the license for more details.
*/
/*! \file singleton.hpp
\brief basic support for the singleton pattern
*/
#ifndef quantlib_singleton_hpp
#define quantlib_singleton_hpp
#include <ql/types.hpp>
#include <boost/shared_ptr.hpp>
#if defined(QL_PATCH_MSVC)
#pragma managed(push, off)
#endif
#include <boost/noncopyable.hpp>
#if defined(QL_PATCH_MSVC)
#pragma managed(pop)
#endif
#include <map>
#if (_MANAGED == 1) || (_M_CEE == 1)
// One of the Visual C++ /clr modes. In this case, the global instance
// map must be declared as a static data member of the class.
#define QL_MANAGED 1
#else
// Every other configuration. The map can be declared as a static
// variable inside the creation method.
#define QL_MANAGED 0
#endif
namespace QuantLib {
#if defined(QL_ENABLE_SESSIONS)
// definition must be provided by the user
Integer sessionId();
#endif
// this is required on VC++ when CLR support is enabled
#if defined(QL_PATCH_MSVC)
#pragma managed(push, off)
#endif
//! Basic support for the singleton pattern.
/*! The typical use of this class is:
\code
class Foo : public Singleton<Foo> {
friend class Singleton<Foo>;
private:
Foo() {}
public:
...
};
\endcode
which, albeit sub-optimal, frees one from the concerns of
creating and managing the unique instance and can serve later
as a single implemementation point should synchronization
features be added.
\ingroup patterns
*/
template <class T>
class Singleton : private boost::noncopyable {
#if (QL_MANAGED == 1)
private:
static std::map<Integer, boost::shared_ptr<T> > instances_;
#endif
public:
//! access to the unique instance
static T& instance();
protected:
Singleton() {}
};
#if (QL_MANAGED == 1)
// static member definition
template <class T>
std::map<Integer, boost::shared_ptr<T> > Singleton<T>::instances_;
#endif
// template definitions
template <class T>
T& Singleton<T>::instance() {
#if (QL_MANAGED == 0)
static std::map<Integer, boost::shared_ptr<T> > instances_;
#endif
#if defined(QL_ENABLE_SESSIONS)
Integer id = sessionId();
#else
Integer id = 0;
#endif
boost::shared_ptr<T>& instance = instances_[id];
if (!instance)
instance = boost::shared_ptr<T>(new T);
return *instance;
}
// reverts the change above
#if defined(QL_PATCH_MSVC)
#pragma managed(pop)
#endif
}
#undef QL_MANAGED
#endif
|