Teuchos_RCPNode.hpp

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#ifndef TEUCHOS_RCP_NODE_HPP
#define TEUCHOS_RCP_NODE_HPP
 
 
#include "Teuchos_ConfigDefs.hpp"
#include "Teuchos_any.hpp"
#include "Teuchos_map.hpp"
#include "Teuchos_ENull.hpp"
#include "Teuchos_Assert.hpp"
#include "Teuchos_Exceptions.hpp"
#include "Teuchos_TypeNameTraits.hpp"
#include "Teuchos_toString.hpp"
#include "Teuchos_getBaseObjVoidPtr.hpp"
 
#if defined(HAVE_TEUCHOSCORE_CXX11) && defined(HAVE_TEUCHOS_THREAD_SAFE) && !defined(DISABLE_ATOMIC_COUNTERS)
#include <atomic>
#define USING_ATOMICS
#endif
 
namespace Teuchos {
 
#ifdef USING_ATOMICS
#  define TEUCHOS_RCP_DECL_ATOMIC(VAR, T) std::atomic<T> VAR
#else
#  define TEUCHOS_RCP_DECL_ATOMIC(VAR, T) T VAR
#endif
 
enum EPrePostDestruction { PRE_DESTROY, POST_DESTROY };
 
enum ERCPStrength { RCP_STRONG=0, RCP_WEAK=1 };
 
enum ERCPNodeLookup { RCP_ENABLE_NODE_LOOKUP, RCP_DISABLE_NODE_LOOKUP };
 
inline void debugAssertStrength(ERCPStrength strength)
{
#ifdef TEUCHOS_DEBUG
  switch (strength) {
  case RCP_STRONG:
    // fall through
  case RCP_WEAK:
    return; // Fine
  default:
    TEUCHOS_TEST_FOR_EXCEPTION(
      true, std::logic_error, "Teuchos::RCPNode: ERCPStrength enum value "
      << strength << " is invalid (neither RCP_STRONG = " << RCP_STRONG
      << " nor RCP_WEAK = " << RCP_WEAK << ").");
  }
#else
  (void) strength; // Silence "unused variable" compiler warning.
#endif // TEUCHOS_DEBUG
}
 
template<>
class TEUCHOSCORE_LIB_DLL_EXPORT ToStringTraits<ERCPStrength> {
public:
  static std::string toString( const ERCPStrength &t )
    {
      switch (t) {
        case RCP_STRONG:
          return "RCP_STRONG";
        case RCP_WEAK:
          return "RCP_WEAK";
        default:
          // Should never get here but fall through ...
          break;
      }
      // Should never get here!
#ifdef TEUCHOS_DEBUG
      TEUCHOS_TEST_FOR_EXCEPT(true);
#else
      return "";
#endif
    }
};
 
 
class TEUCHOSCORE_LIB_DLL_EXPORT RCPNode {
public:
  RCPNode(bool has_ownership_in)
    : has_ownership_(has_ownership_in), extra_data_map_(NULL)
#ifdef TEUCHOS_DEBUG
    ,insertion_number_(-1)
#endif // TEUCHOS_DEBUG
    {
      count_[RCP_STRONG] = 0;
      count_[RCP_WEAK] = 0;
    }
  virtual ~RCPNode()
    {
      if(extra_data_map_)
        delete extra_data_map_;
    }
  bool attemptIncrementStrongCountFromNonZeroValue()
    {
#ifdef USING_ATOMICS
      // this code follows the boost method
      int strong_count_non_atomic = count_[RCP_STRONG];
      for( ;; ) {
        if (strong_count_non_atomic == 0) {
          return false;
        }
        if (std::atomic_compare_exchange_weak( &count_[RCP_STRONG],
          &strong_count_non_atomic, strong_count_non_atomic + 1)) {
          return true;
        }
      }
#else
      // the non-thread safe version - this fails with threads because
      // strong_count_ can become 0 after the check if it is 0 and we would
      // return true with no valid object
      if (count_[RCP_STRONG] == 0) {
        return false;
      }
      else {
        ++count_[RCP_STRONG];
        return true;
      }
#endif
    }
  int strong_count() const
    {
      return count_[RCP_STRONG];
    }
  int weak_count() const // not atomically safe
    {
      return count_[RCP_WEAK] - (count_[RCP_STRONG] ? 1 : 0 ); // weak is +1 when strong > 0
    }
  void incr_count( const ERCPStrength strength )
    {
      debugAssertStrength(strength);
      if (++count_[strength] == 1) {
        if (strength == RCP_STRONG) {
          ++count_[RCP_WEAK]; // this is the special condition - the first strong creates a weak
        }
      }
    }
  int deincr_count( const ERCPStrength strength )
    {
      debugAssertStrength(strength);
#ifdef BREAK_THREAD_SAFETY_OF_DEINCR_COUNT
      --count_[strength];
      return count_[strength];  // not atomically valid
#else
      return --count_[strength];
#endif
    }
  void has_ownership(bool has_ownership_in)
    {
      has_ownership_ = has_ownership_in;
    }
  bool has_ownership() const
    {
      return has_ownership_;
    }
  void set_extra_data(
    const any &extra_data, const std::string& name,
    EPrePostDestruction destroy_when, bool force_unique );
  any& get_extra_data( const std::string& type_name,
    const std::string& name );
  const any& get_extra_data( const std::string& type_name,
    const std::string& name
    ) const
    {
      return const_cast<RCPNode*>(this)->get_extra_data(type_name, name);
    }
  any* get_optional_extra_data(const std::string& type_name,
    const std::string& name );
  const any* get_optional_extra_data(
    const std::string& type_name, const std::string& name
    ) const
    {
      return const_cast<RCPNode*>(this)->get_optional_extra_data(type_name, name);
    }
  virtual bool is_valid_ptr() const = 0;
  virtual void delete_obj() = 0;
  virtual void throw_invalid_obj_exception(
    const std::string& rcp_type_name,
    const void* rcp_ptr,
    const RCPNode* rcp_node_ptr,
    const void* rcp_obj_ptr
    ) const = 0;
  virtual const std::string get_base_obj_type_name() const = 0;
#ifdef TEUCHOS_DEBUG
  virtual const void* get_base_obj_map_key_void_ptr() const = 0;
#endif
protected:
  void pre_delete_extra_data()
    {
      if(extra_data_map_)
        impl_pre_delete_extra_data();
    }
private:
  struct extra_data_entry_t {
    extra_data_entry_t() : destroy_when(POST_DESTROY) {}
    extra_data_entry_t( const any &_extra_data, EPrePostDestruction _destroy_when )
      : extra_data(_extra_data), destroy_when(_destroy_when)
      {}
    any extra_data;
    EPrePostDestruction destroy_when;
  };
  typedef Teuchos::map<std::string,extra_data_entry_t> extra_data_map_t;
 
  TEUCHOS_RCP_DECL_ATOMIC(count_[2], int);
  TEUCHOS_RCP_DECL_ATOMIC(has_ownership_, bool);
 
  extra_data_map_t *extra_data_map_;
  // Above is made a pointer to reduce overhead for the general case when this
  // is not used.  However, this adds just a little bit to the overhead when
  // it is used.
  // Provides the "basic" guarantee!
  void impl_pre_delete_extra_data();
  // Not defined and not to be called
  RCPNode();
  RCPNode(const RCPNode&);
  RCPNode& operator=(const RCPNode&);
#ifdef TEUCHOS_DEBUG
  // removed atomic because mutex handles it - atomic would be redundant
  int insertion_number_;
public:
  void set_insertion_number(int insertion_number_in)
    {
      insertion_number_ = insertion_number_in;
    }
  int insertion_number() const
    {
      return insertion_number_;
    }
#endif // TEUCHOS_DEBUG
};
 
 
TEUCHOSCORE_LIB_DLL_EXPORT void throw_null_ptr_error( const std::string &type_name );
 
 
#ifdef TEUCHOS_DEBUG
  // to fully implement abort for TEUCHOS_STANDARD_CATCH_STATEMENTS in the cpp
  TEUCHOSCORE_LIB_DLL_EXPORT void abort_for_exception_in_destructor(const std::exception &);
  TEUCHOSCORE_LIB_DLL_EXPORT void abort_for_exception_in_destructor(const int &);
  TEUCHOSCORE_LIB_DLL_EXPORT void abort_for_exception_in_destructor();
  // called when RCPNode detects any exception in a destructor
  #define TEUCHOS_CATCH_AND_ABORT                                                   \
  catch(const std::exception &excpt) { abort_for_exception_in_destructor(excpt); }  \
  catch(const int &excpt_code) { abort_for_exception_in_destructor(excpt_code); }   \
  catch(...) { abort_for_exception_in_destructor(); }
#endif
 
class TEUCHOSCORE_LIB_DLL_EXPORT RCPNodeTracer {
public:
 
 
  struct RCPNodeStatistics {
    RCPNodeStatistics()
      : maxNumRCPNodes(0), totalNumRCPNodeAllocations(0),
        totalNumRCPNodeDeletions(0)
      {}
    long int maxNumRCPNodes;
    long int totalNumRCPNodeAllocations;
    long int totalNumRCPNodeDeletions;
  };
 
 
 
  static bool isTracingActiveRCPNodes();
 
#if defined(TEUCHOS_DEBUG) && !defined(HAVE_TEUCHOS_DEBUG_RCP_NODE_TRACING)
  static void setTracingActiveRCPNodes(bool tracingActiveNodes);
#endif
 
  static int numActiveRCPNodes();
 
  static RCPNodeStatistics getRCPNodeStatistics() ;
 
  static void printRCPNodeStatistics(
    const RCPNodeStatistics& rcpNodeStatistics, std::ostream &out);
 
  static void setPrintRCPNodeStatisticsOnExit(
    bool printRCPNodeStatisticsOnExit);
 
  static bool getPrintRCPNodeStatisticsOnExit();
 
  static void setPrintActiveRcpNodesOnExit(bool printActiveRcpNodesOnExit);
 
  static bool getPrintActiveRcpNodesOnExit();
 
  static void printActiveRCPNodes(std::ostream &out);
 
 
 
  static void addNewRCPNode(RCPNode* rcp_node,
    const std::string &info );
 
  static void removeRCPNode( RCPNode* rcp_node );
 
  template<class T>
  static const void* getRCPNodeBaseObjMapKeyVoidPtr(T *p)
    {
#ifdef HAS_TEUCHOS_GET_BASE_OBJ_VOID_PTR
      return getBaseObjVoidPtr(p);
#else
      // This will not return the base address for polymorphic types if
      // multiple inheritance and/or virtual bases are used but returning the
      // static_cast should be okay in how it is used.  It is just that the
      // RCPNode tracing support will not always be able to figure out if two
      // pointers of different type are pointing to the same object or not.
      return static_cast<const void*>(p);
#endif
    }
 
  static RCPNode* getExistingRCPNodeGivenLookupKey(
    const void* lookupKey);
 
  template<class T>
  static RCPNode* getExistingRCPNode(T *p)
    {
      return getExistingRCPNodeGivenLookupKey(getRCPNodeBaseObjMapKeyVoidPtr(p));
    }
 
  static std::string getActiveRCPNodeHeaderString();
 
  static std::string getCommonDebugNotesString();
 
 
};
 
 
#ifdef TEUCHOS_DEBUG
#  define TEUCHOS_RCP_INSERION_NUMBER_STR() \
      "  insertionNumber:      " << rcp_node_ptr->insertion_number() << "\n"
#else
#  define TEUCHOS_RCP_INSERION_NUMBER_STR()
#endif
 
 
template<class T, class Dealloc_T>
class RCPNodeTmpl : public RCPNode {
public:
  RCPNodeTmpl(T* p, Dealloc_T dealloc, bool has_ownership_in)
    : RCPNode(has_ownership_in), ptr_(p),
#ifdef TEUCHOS_DEBUG
      base_obj_map_key_void_ptr_(RCPNodeTracer::getRCPNodeBaseObjMapKeyVoidPtr(p)),
      deleted_ptr_(0),
#endif
      dealloc_(dealloc)
    {}
  RCPNodeTmpl(T* p, Dealloc_T dealloc, bool has_ownership_in, ENull)
    : RCPNode(has_ownership_in), ptr_(p),
#ifdef TEUCHOS_DEBUG
      base_obj_map_key_void_ptr_(0),
      deleted_ptr_(0),
#endif
      dealloc_(dealloc)
    {}
  Dealloc_T& get_nonconst_dealloc()
    { return dealloc_; }
  const Dealloc_T& get_dealloc() const
    { return dealloc_; }
  ~RCPNodeTmpl()
    {
#ifdef TEUCHOS_DEBUG
      TEUCHOS_TEST_FOR_TERMINATION( ptr_!=0,
        "Error, the underlying object must be explicitly deleted before deleting"
        " the node object!" );
#endif
    }
  virtual bool is_valid_ptr() const
    {
      return ptr_ != 0;
    }
  virtual void delete_obj()
    {
      if (ptr_!= 0) {
        this->pre_delete_extra_data(); // Should not throw!
        T* tmp_ptr = ptr_;
#ifdef TEUCHOS_DEBUG
        deleted_ptr_ = tmp_ptr;
#endif
        ptr_ = 0;
        if (has_ownership()) {
#ifdef TEUCHOS_DEBUG
          try {
#endif
            dealloc_.free(tmp_ptr);
#ifdef TEUCHOS_DEBUG
          }
          TEUCHOS_CATCH_AND_ABORT
#endif
        }
      }
    }
  virtual void throw_invalid_obj_exception(
    const std::string& rcp_type_name,
    const void* rcp_ptr,
    const RCPNode* rcp_node_ptr,
    const void* rcp_obj_ptr
    ) const
    {
      TEUCHOS_TEST_FOR_EXCEPT_MSG( ptr_!=0, "Internal coding error!" );
      const T* deleted_ptr =
#ifdef TEUCHOS_DEBUG
        deleted_ptr_
#else
        0
#endif
        ;
      TEUCHOS_ASSERT(rcp_node_ptr);
      TEUCHOS_TEST_FOR_EXCEPTION( true, DanglingReferenceError,
        "Error, an attempt has been made to dereference the underlying object\n"
        "from a weak smart pointer object where the underling object has already\n"
        "been deleted since the strong count has already gone to zero.\n"
        "\n"
        "Context information:\n"
        "\n"
        "  RCP type:             " << rcp_type_name << "\n"
        "  RCP address:          " << rcp_ptr << "\n"
        "  RCPNode type:         " << typeName(*this) << "\n"
        "  RCPNode address:      " << rcp_node_ptr << "\n"
        TEUCHOS_RCP_INSERION_NUMBER_STR()
        "  RCP ptr address:      " << rcp_obj_ptr << "\n"
        "  Concrete ptr address: " << deleted_ptr << "\n"
        "\n"
        << RCPNodeTracer::getCommonDebugNotesString()
        );
      // 2008/09/22: rabartl: Above, we do not provide the concreate object
      // type or the concrete object address.  In the case of the concrete
      // object address, in a non-debug build, we don't want to pay a price
      // for extra storage that we strictly don't need.  In the case of the
      // concrete object type name, we don't want to force non-debug built
      // code to have the require that types be fully defined in order to use
      // the memory management software.  This is related to bug 4016.
 
    }
  const std::string get_base_obj_type_name() const
    {
#ifdef TEUCHOS_DEBUG
      return TypeNameTraits<T>::name();
#else
      return "UnknownType";
#endif
    }
#ifdef TEUCHOS_DEBUG
  const void* get_base_obj_map_key_void_ptr() const
    {
      return base_obj_map_key_void_ptr_;
    }
#endif
private:
  T *ptr_;
#ifdef TEUCHOS_DEBUG
  const void *base_obj_map_key_void_ptr_;
  T *deleted_ptr_;
#endif
  Dealloc_T dealloc_;
  // not defined and not to be called
  RCPNodeTmpl();
  RCPNodeTmpl(const RCPNodeTmpl&);
  RCPNodeTmpl& operator=(const RCPNodeTmpl&);
 
}; // end class RCPNodeTmpl<T>
 
 
class TEUCHOSCORE_LIB_DLL_EXPORT ActiveRCPNodesSetup {
public:
  ActiveRCPNodesSetup();
  ~ActiveRCPNodesSetup();
  void foo();
private:
  static int count_;
};
 
 
} // namespace Teuchos
 
 
namespace {
// This static variable is declared before all other static variables that
// depend on RCP or other classes. Therefore, this static variable will be
// deleted *after* all of these other static variables that depend on RCP or
// created classes go away!  This ensures that the node tracing machinery is
// setup and torn down correctly (this is the same trick used by the standard
// stream objects in many compiler implementations).
Teuchos::ActiveRCPNodesSetup local_activeRCPNodesSetup;
} // namespace (anonymous)
 
 
namespace Teuchos {
 
class TEUCHOSCORE_LIB_DLL_EXPORT RCPNodeHandle {
public:
  RCPNodeHandle (ENull null_arg = null)
    : node_ (0), strength_ (RCP_STRONG)
  {
    (void) null_arg; // Silence "unused variable" compiler warning.
  }
 
  RCPNodeHandle (RCPNode* node,
                 ERCPStrength strength_in = RCP_STRONG,
                 bool newNode = true)
    : node_ (node), strength_ (strength_in)
  {
#ifdef TEUCHOS_DEBUG
    TEUCHOS_ASSERT(node);
#endif // TEUCHOS_DEBUG
 
    bind();
 
#ifdef TEUCHOS_DEBUG
    // Add the node if this is the first RCPNodeHandle to get it.  We have
    // to add it because unbind() will call the remove_RCPNode(...) function
    // and it needs to match when node tracing is on from the beginning.
    if (RCPNodeTracer::isTracingActiveRCPNodes() && newNode) {
      std::ostringstream os;
      os << "{T=Unknown, ConcreteT=Unknown, p=Unknown,"
         << " has_ownership="<<node_->has_ownership()<<"}";
      RCPNodeTracer::addNewRCPNode(node_, os.str());
    }
#else
    (void) newNode; // Silence "unused variable" compiler warning.
#endif // TEUCHOS_DEBUG
  }
 
#ifdef TEUCHOS_DEBUG
  template<typename T>
  RCPNodeHandle (RCPNode* node, T *p, const std::string &T_name,
                 const std::string &ConcreteT_name,
                 const bool has_ownership_in,
                 ERCPStrength strength_in = RCP_STRONG)
    : node_ (node), strength_ (strength_in)
  {
    TEUCHOS_ASSERT(strength_in == RCP_STRONG); // Can't handle weak yet!
    TEUCHOS_ASSERT(node_);
    bind();
    if (RCPNodeTracer::isTracingActiveRCPNodes()) {
      std::ostringstream os;
      os << "{T="<<T_name<<", ConcreteT="<< ConcreteT_name
         <<", p="<<static_cast<const void*>(p)
         <<", has_ownership="<<has_ownership_in<<"}";
      RCPNodeTracer::addNewRCPNode(node_, os.str());
    }
  }
#endif // TEUCHOS_DEBUG
 
  RCPNodeHandle (const RCPNodeHandle& node_ref)
    : node_ (node_ref.node_), strength_ (node_ref.strength_)
  {
    bind();
  }
 
  RCPNodeHandle (RCPNodeHandle&& node_ref)
    : node_ (node_ref.node_), strength_ (node_ref.strength_)
  {
    node_ref.node_ = 0;
    node_ref.strength_ = RCP_STRONG;
  }
 
  void swap (RCPNodeHandle& node_ref) {
    std::swap (node_ref.node_, node_);
    std::swap (node_ref.strength_, strength_);
  }
 
 
 
  RCPNodeHandle& operator= (ENull) {
    unbind(); // May throw in some cases
    node_ = 0;
    strength_ = RCP_STRONG;
    return *this;
  }
 
  RCPNodeHandle& operator= (const RCPNodeHandle& node_ref) {
    // NOTE: Don't need to check assignment to self since user-facing classes
    // do that!
    unbind(); // May throw in some cases
    node_ = node_ref.node_;
    strength_ = node_ref.strength_;
    bind();
    return *this;
  }
 
  RCPNodeHandle& operator= (RCPNodeHandle&& node_ref) {
    // NOTE: Don't need to check assignment to self since user-facing classes
    // do that!
    unbind(); // May throw in some cases
    node_ = node_ref.node_;
    strength_ = node_ref.strength_;
    node_ref.node_ = 0;
    node_ref.strength_ = RCP_STRONG;
    return *this;
  }
 
  ~RCPNodeHandle() {
    unbind();
  }
 
  // otherwise return a null handle
  RCPNodeHandle create_strong_lock() const {
    // make weak handle
    RCPNodeHandle possibleStrongNode(node_, RCP_WEAK, false);
    if (possibleStrongNode.attemptConvertWeakToStrong()) {
      return possibleStrongNode; // success - we have a good strong handle
    }
    return RCPNodeHandle(); // failure - return an empty handle
  }
 
  RCPNodeHandle create_weak() const {
    if (node_) {
      return RCPNodeHandle(node_, RCP_WEAK, false);
    }
    return RCPNodeHandle();
  }
  RCPNodeHandle create_strong() const {
    if (node_) {
      return RCPNodeHandle(node_, RCP_STRONG, false);
    }
    return RCPNodeHandle();
  }
  RCPNode* node_ptr() const {
    return node_;
  }
  bool is_node_null() const {
    return node_==0;
  }
  bool is_valid_ptr() const {
    if (node_) {
      return node_->is_valid_ptr();
    }
    return true; // Null is a valid ptr!
  }
  bool same_node(const RCPNodeHandle &node2) const {
    return node_ == node2.node_;
  }
  int strong_count() const {
    if (node_) {
      return node_->strong_count();
    }
    return 0;
  }
  int weak_count() const {
    if (node_) {
      return node_->weak_count(); // Not atomically safe
    }
    return 0;
  }
  int total_count() const {
    if (node_) {
      return node_->strong_count() + node_->weak_count(); // not atomically safe
    }
    return 0;
  }
  ERCPStrength strength() const {
    return strength_;
  }
  void has_ownership(bool has_ownership_in)
    {
      if (node_)
        node_->has_ownership(has_ownership_in);
    }
  bool has_ownership() const
    {
      if (node_)
        return node_->has_ownership();
      return false;
    }
  void set_extra_data(
    const any &extra_data, const std::string& name,
    EPrePostDestruction destroy_when, bool force_unique
    )
    {
      debug_assert_not_null();
      node_->set_extra_data(extra_data, name, destroy_when, force_unique);
    }
  any& get_extra_data( const std::string& type_name,
    const std::string& name
    )
    {
      debug_assert_not_null();
      return node_->get_extra_data(type_name, name);
    }
  const any& get_extra_data( const std::string& type_name,
    const std::string& name
    ) const
    {
      return const_cast<RCPNodeHandle*>(this)->get_extra_data(type_name, name);
    }
  any* get_optional_extra_data(
    const std::string& type_name, const std::string& name
    )
    {
      debug_assert_not_null();
      return node_->get_optional_extra_data(type_name, name);
    }
  const any* get_optional_extra_data(
    const std::string& type_name, const std::string& name
    ) const
    {
      return const_cast<RCPNodeHandle*>(this)->get_optional_extra_data(type_name, name);
    }
  void debug_assert_not_null() const
    {
#ifdef TEUCHOS_DEBUG
      if (!node_)
        throw_null_ptr_error(typeName(*this));
#endif
    }
  template<class RCPType>
  void assert_valid_ptr(const RCPType& rcp_obj) const
    {
      if (!node_)
        return; // Null is a valid pointer!
      if (!is_valid_ptr()) {
        node_->throw_invalid_obj_exception( typeName(rcp_obj),
          this, node_, rcp_obj.access_private_ptr() );
      }
    }
  template<class RCPType>
  void debug_assert_valid_ptr(const RCPType& rcp_obj) const
    {
#ifdef TEUCHOS_DEBUG
      assert_valid_ptr(rcp_obj);
#endif
    }
#ifdef TEUCHOS_DEBUG
  const void* get_base_obj_map_key_void_ptr() const
    {
      if (node_)
        return node_->get_base_obj_map_key_void_ptr();
      return 0;
    }
#endif
private:
  RCPNode *node_;
  ERCPStrength strength_;
  // atomically safe conversion of a weak handle to a strong handle if
  // possible - if not possible nothing changes
  bool attemptConvertWeakToStrong() {
    if (node_->attemptIncrementStrongCountFromNonZeroValue()) {
      // because we converted strong + 1 we account for this by doing weak - 1
      node_->deincr_count(RCP_WEAK);
      // we have successfully incremented the strong count by one
      strength_ = RCP_STRONG;
      return true;
    }
    return false;
  }
  inline void bind()
    {
      if (node_)
        node_->incr_count(strength_);
    }
  inline void unbind()
    {
      if (node_) {
        if(strength_ == RCP_STRONG) {
          // only strong checks for --strong == 0
          if (node_->deincr_count(RCP_STRONG) == 0) {
            unbindOneStrong();
            // but if strong hits 0 it also decrements weak_count_plus which
            // is weak + (strong != 0)
            if( node_->deincr_count(RCP_WEAK) == 0) {
              unbindOneTotal();
            }
          }
        }
        else if(node_->deincr_count(RCP_WEAK) == 0) {  // weak checks here
          unbindOneTotal();
        }
      }
    }
  void unbindOneStrong();
  void unbindOneTotal();
};
 
 
inline
std::ostream& operator<<(std::ostream& out, const RCPNodeHandle& node)
{
  // mfh 15 Sep 2015: Make sure that NULL pointers print consistently.
  // Clang 3.5 likes to print an empty string in that case, while GCC
  // prints 0.  Thus, we test if the pointer is NULL and print 0 in
  // that case.  This is important for MueLu tests, which compare
  // string print-outs.
  if (node.node_ptr () == NULL) {
    out << "0";
  } else {
    out << node.node_ptr ();
  }
  return out;
}
 
 
class TEUCHOSCORE_LIB_DLL_EXPORT RCPNodeThrowDeleter {
public:
  RCPNodeThrowDeleter(RCPNode *node)
    : node_(node)
    {}
  ~RCPNodeThrowDeleter()
    {
      if (node_) {
        node_->has_ownership(false); // Avoid actually deleting ptr_
        node_->delete_obj(); // Sets the pointer ptr_=0 to allow RCPNode delete
        delete node_;
      }
    }
  RCPNode* get() const
    {
      return node_;
    }
  void release()
    {
      node_ = 0;
    }
private:
  RCPNode *node_;
  RCPNodeThrowDeleter(); // Not defined
  RCPNodeThrowDeleter(const RCPNodeThrowDeleter&); // Not defined
  RCPNodeThrowDeleter& operator=(const RCPNodeThrowDeleter&); // Not defined
};
 
 
//
// Unit testing support
//
 
 
#if defined(TEUCHOS_DEBUG) && !defined(HAVE_TEUCHOS_DEBUG_RCP_NODE_TRACING)
 
class SetTracingActiveNodesStack {
public:
  SetTracingActiveNodesStack()
    {RCPNodeTracer::setTracingActiveRCPNodes(true);}
  ~SetTracingActiveNodesStack()
    {RCPNodeTracer::setTracingActiveRCPNodes(false);}
};
 
#  define SET_RCPNODE_TRACING() Teuchos::SetTracingActiveNodesStack setTracingActiveNodesStack;
 
#else
 
#  define SET_RCPNODE_TRACING() (void)0
 
#endif // defined(TEUCHOS_DEBUG) && !defined(HAVE_TEUCHOS_DEBUG_RCP_NODE_TRACING)
 
 
} // end namespace Teuchos
 
 
#endif // TEUCHOS_RCP_NODE_HPP