Proxy.cc

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#include <map>

#include <boost/thread.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>

#include "GeneratorInterface/Herwig7Interface/interface/Proxy.h"

using namespace ThePEG;

static boost::mutex mutex;

typedef std::map<ProxyBase::ProxyID, boost::weak_ptr<ProxyBase> > ProxyMap;

static ProxyMap *getProxyMapInstance()
{
    static struct Sentinel {
        Sentinel() : instance(new ProxyMap) {}
        ~Sentinel() { delete instance; instance = nullptr; }

        ProxyMap    *instance;
    } sentinel;

    return sentinel.instance;
}

ProxyBase::ProxyBase(ProxyID id) :
    id(id)
{
}

ProxyBase::~ProxyBase()
{
    boost::mutex::scoped_lock scoped_lock(mutex);

    ProxyMap *map = getProxyMapInstance();
    if (map)
        map->erase(id);
}

boost::shared_ptr<ProxyBase> ProxyBase::create(ctor_t ctor)
{
    static ProxyBase::ProxyID nextProxyID = 0;

    boost::mutex::scoped_lock scoped_lock(mutex);

    boost::shared_ptr<ProxyBase> proxy(ctor(++nextProxyID));

    ProxyMap *map = getProxyMapInstance();
    if (map)
        map->insert(ProxyMap::value_type(proxy->getID(), proxy));

    return proxy;
}

boost::shared_ptr<ProxyBase> ProxyBase::find(ProxyID id)
{
    boost::mutex::scoped_lock scoped_lock(mutex);

    ProxyMap *map = getProxyMapInstance();
    if (!map)
        return boost::shared_ptr<ProxyBase>();

    ProxyMap::const_iterator pos = map->find(id);
    if (pos == map->end())
        return boost::shared_ptr<ProxyBase>();

    return boost::shared_ptr<ProxyBase>(pos->second);
}