170 lines
4.1 KiB
C++
170 lines
4.1 KiB
C++
/*****************************************************************************
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*
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* This file is part of Mapnik (c++ mapping toolkit)
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*
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* Copyright (C) 2014 Artem Pavlenko
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*****************************************************************************/
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#ifndef MAPNIK_UTILS_HPP
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#define MAPNIK_UTILS_HPP
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#include <mapnik/config.hpp>
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#include <mapnik/unique_lock.hpp>
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// stl
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#include <stdexcept> // std::runtime_error
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#include <cstdlib> // std::atexit
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#include <new> // operator new
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#ifdef MAPNIK_THREADSAFE
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#include <mutex>
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#endif
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namespace mapnik
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{
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template <typename T>
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class CreateUsingNew
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{
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public:
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static T* create()
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{
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return new T;
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}
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static void destroy(T* obj)
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{
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delete obj;
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}
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};
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template <typename T>
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class CreateStatic
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{
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private:
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union MaxAlign
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{
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char t_[sizeof(T)];
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short int shortInt_;
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int int_;
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long int longInt_;
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float float_;
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double double_;
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long double longDouble_;
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struct Test;
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int Test::* pMember_;
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int (Test::*pMemberFn_)(int);
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};
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public:
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static T* create()
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{
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static MaxAlign staticMemory;
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return new(&staticMemory) T;
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}
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static void destroy(volatile T* obj)
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{
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obj->~T();
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}
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};
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#ifdef __GNUC__
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template <typename T,
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template <typename U> class CreatePolicy=CreateStatic> class MAPNIK_DECL singleton
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{
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#else
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template <typename T,
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template <typename U> class CreatePolicy=CreateStatic> class singleton
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{
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#endif
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friend class CreatePolicy<T>;
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static T* pInstance_;
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static bool destroyed_;
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singleton(const singleton &rhs);
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singleton& operator=(const singleton&);
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static void onDeadReference()
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{
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throw std::runtime_error("dead reference!");
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}
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static void DestroySingleton()
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{
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CreatePolicy<T>::destroy(pInstance_);
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pInstance_ = 0;
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destroyed_ = true;
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}
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protected:
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#ifdef MAPNIK_THREADSAFE
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static std::mutex mutex_;
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#endif
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singleton() {}
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public:
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static T& instance()
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{
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if (! pInstance_)
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{
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#ifdef MAPNIK_THREADSAFE
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mapnik::scoped_lock lock(mutex_);
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#endif
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if (! pInstance_)
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{
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if (destroyed_)
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{
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destroyed_ = false;
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onDeadReference();
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}
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else
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{
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pInstance_ = CreatePolicy<T>::create();
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// register destruction
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std::atexit(&DestroySingleton);
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}
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}
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}
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return *pInstance_;
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}
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};
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#ifdef MAPNIK_THREADSAFE
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template <typename T,
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template <typename U> class CreatePolicy> std::mutex singleton<T,CreatePolicy>::mutex_;
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#endif
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template <typename T,
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template <typename U> class CreatePolicy> T* singleton<T,CreatePolicy>::pInstance_=0;
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template <typename T,
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template <typename U> class CreatePolicy> bool singleton<T,CreatePolicy>::destroyed_=false;
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#ifdef _WINDOWS
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// UTF8 <--> UTF16 conversion routines
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MAPNIK_DECL std::string utf16_to_utf8(std::wstring const& wstr);
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MAPNIK_DECL std::wstring utf8_to_utf16(std::string const& str);
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#endif // _WINDOWS
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}
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#endif // MAPNIK_UTILS_HPP
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