text: // Distributed under the Boost Software License, Version 1.0. (See
  // accompanying file LICENSE_1_0.txt or copy at
  // http://www.boost.org/LICENSE_1_0.txt)
  // (C) Copyright 2008-2009,2012 Vicente J. Botet Escriba
  
  #ifndef BOOST_THREAD_STRICT_LOCK_HPP
  #define BOOST_THREAD_STRICT_LOCK_HPP
  
  #include <boost/thread/detail/config.hpp>
  #include <boost/thread/detail/delete.hpp>
  #include <boost/thread/detail/lockable_wrapper.hpp>
  #include <boost/thread/lock_options.hpp>
  #include <boost/thread/lock_traits.hpp>
  #include <boost/thread/lockable_traits.hpp>
  #include <boost/thread/lockable_concepts.hpp>
  #include <boost/thread/lock_concepts.hpp>
  #include <boost/thread/exceptions.hpp>
  #include <boost/throw_exception.hpp>
  
  #include <boost/config/abi_prefix.hpp>
  
  namespace boost
  {
  
  
    //[strict_lock
    template <typename Lockable>
    class strict_lock
    {
  
      BOOST_CONCEPT_ASSERT(( BasicLockable<Lockable> ));
    public:
      typedef Lockable mutex_type;
  
      // construct/copy/destroy:
  
      BOOST_THREAD_NO_COPYABLE( strict_lock)
  
      /**
       * Constructor from a mutex reference.
       *
       * @param mtx the mutex to lock.
       *
       * __Effects: Stores a reference to the mutex to lock and locks it.
       * __Throws: Any exception BasicMutex::lock() can throw.
       */
      explicit strict_lock(mutex_type& mtx) :
        mtx_(mtx)
      {
        mtx.lock();
      } /*< locks on construction >*/
  
  
  #if ! defined BOOST_THREAD_NO_CXX11_HDR_INITIALIZER_LIST
      strict_lock(std::initializer_list<thread_detail::lockable_wrapper<Lockable> > l_) :
        mtx_(*(const_cast<thread_detail::lockable_wrapper<Lockable>*>(l_.begin())->m))
      {
        mtx_.lock();
      }
  #endif
  
      /**
       * Destructor
       *
       * __Effects: unlocks the stored mutex.
       *
       * __Throws
       */
      ~strict_lock()
      {
        mtx_.unlock();
      } /*< unlocks on destruction >*/
  
  
      // observers
  
      /**
       * @return the owned mutex.
       */
      mutex_type* mutex() const BOOST_NOEXCEPT
      {
        return &mtx_;
      }
  
      /**
       * @return whether this lock is locking a mutex.
       */
      bool owns_lock() const BOOST_NOEXCEPT
      {
        return true;
      }
  
      /**
       * @return whether this lock is locking that mutex.
       */
      bool owns_lock(const mutex_type* l) const BOOST_NOEXCEPT
      {
        return l == mutex();
      } /*< strict locks specific function >*/
  
      //BOOST_ADRESS_OF_DELETE(strict_lock) /*< disable aliasing >*/
      //BOOST_HEAP_ALLOCATION_DELETE(strict_lock) /*< disable heap allocation >*/
  
      /*< no possibility to unlock >*/
  
    private:
      mutex_type& mtx_;
    };
    //]
    template <typename Lockable>
    struct is_strict_lock_sur_parole<strict_lock<Lockable> > : true_type
    {
    };
  
    /**
     * A nested strict lock is a scoped lock guard ensuring the mutex is locked on its
     * scope, by taking ownership of an nesting lock, locking the mutex on construction if not already locked
     * and restoring the ownership to the nesting lock on destruction.
     */
    //[nested_strict_lock
    template <typename Lock>
    class nested_strict_lock
    {
      BOOST_CONCEPT_ASSERT(( BasicLock<Lock> )); /*< The Lock must be a movable lock >*/
    public:
      typedef typename Lock::mutex_type mutex_type; /*< Name the lockable type locked by Lock >*/
  
      BOOST_THREAD_NO_COPYABLE( nested_strict_lock)
  
      /**
       * Constructor from a nesting @c Lock.
       *
       * @param lk the nesting lock
       *
       * __Requires: <c>lk.mutex() != null_ptr</c>
       * __Effects: Stores the reference to the lock parameter and takes ownership on it.
       * If the lock doesn't owns the mutex @c mtx lock it.
       * __Postconditions: @c owns_lock(lk.mutex())
       * __StrongException
       * __Throws:
       *
       * - lock_error when BOOST_THREAD_THROW_IF_PRECONDITION_NOT_SATISFIED is defined and lk.mutex() == null_ptr
       *
       * - Any exception that @c lk.lock() can throw.
       *
       */
      explicit nested_strict_lock(Lock& lk) :
        lk_(lk) /*< Store reference to lk >*/
      {
        /*< Define BOOST_THREAD_DONT_CHECK_PRECONDITIONS if you don't want to check lk ownership >*/
        BOOST_THREAD_ASSERT_PRECONDITION(  lk.mutex() != 0,
            lock_error()
        );
        if (!lk.owns_lock()) lk.lock(); /*< ensures it is locked >*/
        tmp_lk_ = move(lk); /*< Move ownership to temporary lk >*/
      }
  
  #if ! defined BOOST_THREAD_NO_CXX11_HDR_INITIALIZER_LIST
      nested_strict_lock(std::initializer_list<thread_detail::lockable_wrapper<Lock> > l_) :
        lk_(*(const_cast<thread_detail::lockable_wrapper<Lock>*>(l_.begin())->m))
      {
        /*< Define BOOST_THREAD_DONT_CHECK_PRECONDITIONS if you don't want to check lk ownership >*/
        BOOST_THREAD_ASSERT_PRECONDITION(  lk_.mutex() != 0,
            lock_error()
        );
        if (!lk_.owns_lock()) lk_.lock(); /*< ensures it is locked >*/
        tmp_lk_ = move(lk_); /*< Move ownership to temporary lk >*/
      }
  #endif
  
      /**
       * Destructor
       *
       * __Effects: Restores ownership to the nesting lock.
       */
      ~nested_strict_lock()BOOST_NOEXCEPT
      {
        lk_ = move(tmp_lk_); /*< Move ownership to nesting lock >*/
      }
  
      // observers
      /**
       * return @c the owned mutex.
       */
      mutex_type* mutex() const BOOST_NOEXCEPT
      {
        return tmp_lk_.mutex();
      }
  
      /**
       * @return whether this lock is locking a mutex.
       */
      bool owns_lock() const BOOST_NOEXCEPT
      {
        return true;
      }
  
      /**
       * @return whether if this lock is locking that mutex.
       */
      bool owns_lock(mutex_type const* l) const BOOST_NOEXCEPT
      {
        return l == mutex();
      }
  
      //BOOST_ADRESS_OF_DELETE(nested_strict_lock)
      //BOOST_HEAP_ALLOCATEION_DELETE(nested_strict_lock)
  
    private:
      Lock& lk_;
      Lock tmp_lk_;
    };
    //]
  
    template <typename Lock>
    struct is_strict_lock_sur_parole<nested_strict_lock<Lock> > : true_type
    {
    };
  
  #if ! defined BOOST_THREAD_NO_MAKE_STRICT_LOCK
    template <typename Lockable>
    strict_lock<Lockable> make_strict_lock(Lockable& mtx)
    {
      return { thread_detail::lockable_wrapper<Lockable>(mtx) };
    }
    template <typename Lock>
    nested_strict_lock<Lock> make_nested_strict_lock(Lock& lk)
    {
      return { thread_detail::lockable_wrapper<Lock>(lk) };
    }
  #endif
  }
  #include <boost/config/abi_suffix.hpp>
  
  #endif
  