171 lines
4 KiB
C++
171 lines
4 KiB
C++
/*****************************************************************************
|
|
*
|
|
* This file is part of Mapnik (c++ mapping toolkit)
|
|
*
|
|
* Copyright (C) 2011 Artem Pavlenko
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library 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 GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library; if not, write to the Free Software
|
|
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
|
|
*
|
|
*****************************************************************************/
|
|
|
|
#ifndef MAPNIK_UTILS_HPP
|
|
#define MAPNIK_UTILS_HPP
|
|
|
|
#include <mapnik/config.hpp>
|
|
|
|
// boost
|
|
#ifdef MAPNIK_THREADSAFE
|
|
#include <boost/thread/mutex.hpp>
|
|
#endif
|
|
|
|
// stl
|
|
#include <stdexcept>
|
|
#include <cstdlib>
|
|
#include <limits>
|
|
#include <ctime>
|
|
#include <algorithm>
|
|
#include <cmath>
|
|
|
|
namespace mapnik
|
|
{
|
|
|
|
#ifdef MAPNIK_THREADSAFE
|
|
using boost::mutex;
|
|
#endif
|
|
|
|
template <typename T>
|
|
class CreateUsingNew
|
|
{
|
|
public:
|
|
static T* create()
|
|
{
|
|
return new T;
|
|
}
|
|
static void destroy(T* obj)
|
|
{
|
|
delete obj;
|
|
}
|
|
};
|
|
|
|
template <typename T>
|
|
class CreateStatic
|
|
{
|
|
private:
|
|
union MaxAlign
|
|
{
|
|
char t_[sizeof(T)];
|
|
short int shortInt_;
|
|
int int_;
|
|
long int longInt_;
|
|
float float_;
|
|
double double_;
|
|
long double longDouble_;
|
|
struct Test;
|
|
int Test::* pMember_;
|
|
int (Test::*pMemberFn_)(int);
|
|
};
|
|
|
|
public:
|
|
|
|
static T* create()
|
|
{
|
|
static MaxAlign staticMemory;
|
|
return new(&staticMemory) T;
|
|
}
|
|
static void destroy(volatile T* obj)
|
|
{
|
|
obj->~T();
|
|
}
|
|
};
|
|
|
|
|
|
template <typename T,
|
|
template <typename U> class CreatePolicy=CreateStatic> class MAPNIK_DECL singleton
|
|
{
|
|
friend class CreatePolicy<T>;
|
|
static T* pInstance_;
|
|
static bool destroyed_;
|
|
singleton(const singleton &rhs);
|
|
singleton& operator=(const singleton&);
|
|
|
|
static void onDeadReference()
|
|
{
|
|
throw std::runtime_error("dead reference!");
|
|
}
|
|
|
|
static void DestroySingleton()
|
|
{
|
|
CreatePolicy<T>::destroy(pInstance_);
|
|
pInstance_ = 0;
|
|
destroyed_ = true;
|
|
}
|
|
|
|
protected:
|
|
|
|
#ifdef MAPNIK_THREADSAFE
|
|
static mutex mutex_;
|
|
#endif
|
|
singleton() {}
|
|
public:
|
|
static T& instance()
|
|
{
|
|
if (! pInstance_)
|
|
{
|
|
#ifdef MAPNIK_THREADSAFE
|
|
mutex::scoped_lock lock(mutex_);
|
|
#endif
|
|
if (! pInstance_)
|
|
{
|
|
if (destroyed_)
|
|
{
|
|
destroyed_ = false;
|
|
onDeadReference();
|
|
}
|
|
else
|
|
{
|
|
pInstance_ = CreatePolicy<T>::create();
|
|
|
|
// register destruction
|
|
std::atexit(&DestroySingleton);
|
|
}
|
|
}
|
|
}
|
|
return *pInstance_;
|
|
}
|
|
};
|
|
|
|
#ifdef MAPNIK_THREADSAFE
|
|
template <typename T,
|
|
template <typename U> class CreatePolicy> mutex singleton<T,CreatePolicy>::mutex_;
|
|
#endif
|
|
|
|
template <typename T,
|
|
template <typename U> class CreatePolicy> T* singleton<T,CreatePolicy>::pInstance_=0;
|
|
template <typename T,
|
|
template <typename U> class CreatePolicy> bool singleton<T,CreatePolicy>::destroyed_=false;
|
|
|
|
|
|
#ifdef _WINDOWS
|
|
|
|
// UTF8 <--> UTF16 conversion routines
|
|
|
|
MAPNIK_DECL std::string utf16_to_utf8(std::wstring const& wstr);
|
|
MAPNIK_DECL std::wstring utf8_to_utf16(std::string const& str);
|
|
|
|
#endif // _WINDOWS
|
|
|
|
}
|
|
|
|
#endif // MAPNIK_UTILS_HPP
|