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/* -*- mode: c++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */

 Copyright (C) 2004 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

 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/qldefines.hpp>
#include <boost/shared_ptr.hpp>

namespace QuantLib {

    //! Basic support for the singleton pattern.
    /*! The typical use of this class is:
        class Foo : public Singleton<Foo> {
            friend class Singleton<Foo>;
            Foo() {}
        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>
00051     class Singleton {
        //! access to the unique instance
        static T& instance();
        Singleton() {}
        #ifdef QL_PATCH_MSVC6
        static boost::shared_ptr<T> instance_;
        Singleton(const Singleton&) {}
        void operator=(const Singleton&) {}

    // template definitions

    #ifdef QL_PATCH_MSVC6
    template <class T>
    boost::shared_ptr<T> Singleton<T>::instance_;

    template <class T>
00074     T& Singleton<T>::instance() {
        #ifndef QL_PATCH_MSVC6
        static boost::shared_ptr<T> instance_(new T);
        if (!instance_)
            instance_ = boost::shared_ptr<T>(new T);
        return *instance_;



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