text: //-*****************************************************************************
  //
  // Copyright (c) 2009-2013,
  //  Sony Pictures Imageworks Inc. and
  //  Industrial Light & Magic, a division of Lucasfilm Entertainment Company Ltd.
  //
  // 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 Industrial Light & Magic 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 _Alembic_Util_Foundation_h_
  #define _Alembic_Util_Foundation_h_
  
  // tr1/memory is not avaliable in Visual Studio.
  #if !defined(_MSC_VER)
  
  #if defined(__GXX_EXPERIMENTAL_CXX0X) || __cplusplus >= 201103L
  #include <unordered_map>
  #else
  #include <tr1/memory>
  #include <tr1/unordered_map>
  #endif
  
  #elif _MSC_VER <= 1600
  
  // no tr1 in these older versions of MS VS so fall back to boost
  #include <boost/type_traits.hpp>
  #include <boost/ref.hpp>
  #include <boost/format.hpp>
  #include <boost/smart_ptr.hpp>
  #include <boost/static_assert.hpp>
  #include <boost/scoped_ptr.hpp>
  #include <boost/utility.hpp>
  #include <boost/cstdint.hpp>
  #include <boost/array.hpp>
  #include <boost/operators.hpp>
  #include <boost/foreach.hpp>
  #include <boost/unordered_map.hpp>
  
  #else
  #include <unordered_map>
  #endif
  
  #include <memory>
  
  #include <half.h>
  
  #include <iomanip>
  #include <iostream>
  #include <sstream>
  #include <exception>
  #include <limits>
  
  #include <map>
  #include <string>
  #include <vector>
  
  #include <stdio.h>
  #include <stdlib.h>
  #include <string.h>
  #include <assert.h>
  
  #ifdef _MSC_VER
  
  #ifndef WIN32_LEAN_AND_MEAN
  #define WIN32_LEAN_AND_MEAN
  #endif
  
  // needed for mutex stuff
  #include <Windows.h>
  #endif
  
  #ifndef ALEMBIC_VERSION_NS
  #define ALEMBIC_VERSION_NS v7
  #endif
  
  namespace Alembic {
  namespace Util {
  namespace ALEMBIC_VERSION_NS {
  
  #if defined( _MSC_VER ) && _MSC_VER <= 1600
  using boost::dynamic_pointer_cast;
  using boost::enable_shared_from_this;
  using boost::shared_ptr;
  using boost::static_pointer_cast;
  using boost::weak_ptr;
  using boost::unordered_map;
  #define ALEMBIC_LIB_USES_BOOST
  #elif defined(__GXX_EXPERIMENTAL_CXX0X) || __cplusplus >= 201103L
  using std::dynamic_pointer_cast;
  using std::enable_shared_from_this;
  using std::shared_ptr;
  using std::static_pointer_cast;
  using std::weak_ptr;
  using std::unordered_map;
  #else
  using std::tr1::dynamic_pointer_cast;
  using std::tr1::enable_shared_from_this;
  using std::tr1::shared_ptr;
  using std::tr1::static_pointer_cast;
  using std::tr1::weak_ptr;
  using std::tr1::unordered_map;
  #endif
  
  using std::auto_ptr;
  
  // similiar to boost::noncopyable
  // explicitly hides copy construction and copy assignment
  class noncopyable
  {
  protected:
      noncopyable() {}
      ~noncopyable() {}
  
  private:
      noncopyable( const noncopyable& );
      const noncopyable& operator=( const noncopyable& );
  };
  
  // similiar to boost::totally_ordered
  // only need < and == operators and this fills in the rest
  template < class T >
  class totally_ordered
  {
      friend bool operator > ( const T& x, const T& y )
      {
          return y < x;
      }
  
      friend bool operator <= ( const T& x, const T& y )
      {
          return !( y < x );
      }
  
      friend bool operator >= ( const T& x, const T& y )
      {
          return !( x < y );
      }
  
      friend bool operator != ( const T& x, const T& y )
      {
          return !( x == y );
      }
  };
  
  // inspired by boost::mutex
  #ifdef _MSC_VER
  
  class mutex : noncopyable
  {
  public:
      mutex()
      {
          m = CreateMutex( NULL, FALSE, NULL );
      }
  
      ~mutex()
      {
          CloseHandle( m );
      }
  
      void lock()
      {
          WaitForSingleObject( m, INFINITE );
      }
  
      void unlock()
      {
          ReleaseMutex( m );
      }
  
  private:
      HANDLE m;
  };
  
  #else
  
  
  class mutex : noncopyable
  {
  public:
      mutex()
      {
          pthread_mutex_init( &m, NULL );
      }
  
      ~mutex()
      {
          pthread_mutex_destroy( &m );
      }
  
      void lock()
      {
          pthread_mutex_lock( &m );
      }
  
      void unlock()
      {
          pthread_mutex_unlock( &m );
      }
  
  private:
      pthread_mutex_t m;
  };
  
  #endif
  
  class scoped_lock : noncopyable
  {
  public:
      scoped_lock( mutex & l ) : m( l )
      {
          m.lock();
      }
  
      ~scoped_lock()
      {
          m.unlock();
      }
  
  private:
      mutex & m;
  };
  
  } // End namespace ALEMBIC_VERSION_NS
  
  using namespace ALEMBIC_VERSION_NS;
  
  } // End namespace Util
  } // End namespace Alembic
  
  #endif
  