/usr/include/liblas/detail/singleton.hpp is in liblas-dev 1.7.0+dfsg-4.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* $Id$
*
* Project: libLAS - http://liblas.org - A BSD library for LAS format data.
* Purpose: LAS singleton class
* Author: Howard Butler, hobu at hobu.net
*
******************************************************************************
* Copyright (c) 2010, Howard Butler
*
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following
* conditions are met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided
* with the distribution.
* * Neither the name of the Martin Isenburg or Iowa Department
* of Natural Resources nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY
* OF SUCH DAMAGE.
****************************************************************************/
#ifndef LIBLAS_DETAIL_SINGLETON_HPP_INCLUDED
#define LIBLAS_DETAIL_SINGLETON_HPP_INCLUDED
// boost
#include <boost/shared_ptr.hpp>
#include <boost/utility.hpp>
#include <boost/thread/once.hpp>
#include <boost/scoped_ptr.hpp>
// std
#include <iosfwd> // std::ostream
#include <string>
#include <memory>
#include <cstdlib> // std::size_t
namespace liblas {
// From the boost cookbook
// http://www.boostcookbook.com/Recipe:/1235044
// Warning: If T's constructor throws, instance() will return a null reference.
template<class T>
class Singleton : private boost::noncopyable
{
public:
static T& get()
{
boost::call_once(init, flag);
return *t;
}
static void init() // never throws
{
t.reset(new T());
}
protected:
~Singleton() {}
Singleton() {}
private:
static boost::scoped_ptr<T> t;
static boost::once_flag flag;
};
template<class T> boost::scoped_ptr<T> Singleton<T>::t(0);
template<class T> boost::once_flag Singleton<T>::flag = BOOST_ONCE_INIT;
} // namespace liblas
#endif // ndef LIBLAS_DETAIL_SINGLETON_HPP_INCLUDED
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