Teuchos::RCP< T > Class Template Reference
[Teuchos Memory Management Utilities]

Smart reference counting pointer class for automatic garbage collection. More...

#include <Teuchos_RCPDecl.hpp>

List of all members.

Public Types
typedef T	element_type
typedef PrivateUtilityPack::RCP_node	node_t
Public Member Functions
	RCP (ENull null_arg=null)
	Initialize RCP<T> to NULL.
	RCP (T *p, bool has_ownership=false)
	Construct from a raw pointer.
	RCP (const RCP< T > &r_ptr)
	Initialize from another RCP<T> object.
template<class T2>
	RCP (const RCP< T2 > &r_ptr)
	Initialize from another RCP<T2> object (implicit conversion only).
	~RCP ()
	Removes a reference to a dynamically allocated object and possibly deletes the object if owned.
RCP< T > &	operator= (const RCP< T > &r_ptr)
	Copy the pointer to the referenced object and increment the reference count.
T *	operator-> () const
	Pointer (->) access to members of underlying object.
T &	operator * () const
	Dereference the underlying object.
T *	get () const
	Get the raw C++ pointer to the underlying object.
T *	release ()
	Release the ownership of the underlying dynamically allocated object.
int	count () const
	Return the number of RCP<> objects that have a reference to the underlying pointer that is being shared.
void	set_has_ownership ()
	Give this and other RCP<> objects ownership of the referenced object this->get().
bool	has_ownership () const
	Returns true if this has ownership of object pointed to by this->get() in order to delete it.
template<class T2>
bool	shares_resource (const RCP< T2 > &r_ptr) const
	Returns true if the smart pointers share the same underlying reference-counted object.
const RCP< T > &	assert_not_null () const
	Throws std::logic_error if this->get()==NULL, otherwise returns reference to *this.
Related Functions
(Note that these are not member functions.)
enum	ENull
	Used to initialize a RCP object to NULL using an implicit conversion! More...
enum	EPrePostDestruction
	Used to specify a pre or post destruction of extra data. More...
RCP< T >	rcp (T *p, bool owns_mem=true)
	Create a RCP object properly typed.
RCP< T >	rcp (T *p, Dealloc_T dealloc, bool owns_mem)
	Initialize from a raw pointer with a deallocation policy.
bool	is_null (const RCP< T > &p)
	Returns true if p.get()==NULL.
bool	operator== (const RCP< T > &p, ENull)
	Returns true if p.get()==NULL.
bool	operator!= (const RCP< T > &p, ENull)
	Returns true if p.get()!=NULL.
bool	operator== (const RCP< T1 > &p1, const RCP< T2 > &p2)
	Return true if two RCP objects point to the same referenced-counted object and have the same node.
bool	operator!= (const RCP< T1 > &p1, const RCP< T2 > &p2)
	Return true if two RCP objects do not point to the same referenced-counted object and have the same node.
RCP< T2 >	rcp_implicit_cast (const RCP< T1 > &p1)
	Implicit cast of underlying RCP type from T1* to T2*.
RCP< T2 >	rcp_static_cast (const RCP< T1 > &p1)
	Static cast of underlying RCP type from T1* to T2*.
RCP< T2 >	rcp_const_cast (const RCP< T1 > &p1)
	Constant cast of underlying RCP type from T1* to T2*.
RCP< T2 >	rcp_dynamic_cast (const RCP< T1 > &p1, bool throw_on_fail=false)
	Dynamic cast of underlying RCP type from T1* to T2*.
void	set_extra_data (const T1 &extra_data, const std::string &name, RCP< T2 > *p, EPrePostDestruction destroy_when=POST_DESTROY, bool force_unique=true)
	Set extra data associated with a RCP object.
T1 &	get_extra_data (RCP< T2 > &p, const std::string &name)
	Get a non-const reference to extra data associated with a RCP object.
const T1 &	get_extra_data (const RCP< T2 > &p, const std::string &name)
	Get a const reference to extra data associated with a RCP object.
T1 *	get_optional_extra_data (RCP< T2 > &p, const std::string &name)
	Get a pointer to non-const extra data (if it exists) associated with a RCP object.
const T1 *	get_optional_extra_data (const RCP< T2 > &p, const std::string &name)
	Get a pointer to const extra data (if it exists) associated with a RCP object.
Dealloc_T &	get_dealloc (RCP< T > &p)
	Return a non-const reference to the underlying deallocator object.
const Dealloc_T &	get_dealloc (const RCP< T > &p)
	Return a const reference to the underlying deallocator object.
Dealloc_T *	get_optional_dealloc (RCP< T > &p)
	Return a pointer to the underlying non-const deallocator object if it exists.
const Dealloc_T *	get_optional_dealloc (const RCP< T > &p)
	Return a pointer to the underlying const deallocator object if it exists.
std::ostream &	operator<< (std::ostream &out, const RCP< T > &p)
	Output stream inserter.
void	print_active_RCP_nodes (std::ostream &out)
	Print the list of currently active RCP nodes.

---

Detailed Description

template<class T>
class Teuchos::RCP< T >

Smart reference counting pointer class for automatic garbage collection.

For a carefully written discussion about what this class is and basic details on how to use it see the beginners guide.

Quickstart for RCP

Here we present a short, but fairly comprehensive, quick-start for the use of RCP<>. The use cases described here should cover the overwhelming majority of the use instances of RCP<> in a typical program.

The following class hierarchy will be used in the C++ examples given below.

class A { public: virtual ~A(){} virtual void f(){} };
class B1 : virtual public A {};
class B2 : virtual public A {};
class C : virtual public B1, virtual public B2 {};

class D {};
class E : public D {};

All of the following code examples used in this quickstart are assumed to be in the namespace Teuchos or have appropriate using Teuchos::... declarations. This removes the need to explicitly use Teuchos:: to qualify classes, functions and other declarations from the Teuchos namespace. Note that some of the runtime checks are denoted as "debug runtime checked" which means that checking will only be performed in a debug build (that is one where the macro TEUCHOS_REFCOUNTPTR_ASSERT_NONNULL, or TEUCHOS_DEBUG is defined at compile time).

1. Creation of RCP<> objects
   1. Creating a RCP<> object using new

      RCP<C> c_ptr = rcp(new C);
      

   2. Creating a RCP<> object to an array allocated using new[n] : Teuchos::DeallocArrayDelete

      RCP<C> c_ptr = rcp(new C[n],DeallocArrayDelete<C>(),true);
      

   3. Creating a RCP<> object equipped with a specialized deallocator function : Teuchos::DeallocFunctorDelete

      void someDeallocFunction(C* c_ptr);
      
      RCP<C> c_ptr = rcp(new deallocFunctorDelete<C>(someDeallocFunction),true);
      

   4. Initializing a RCP<> object to NULL

      RCP<C> c_ptr;
      

      or

      RCP<C> c_ptr = null;
      

   5. Initializing a RCP<> object to an object {not} allocated with new

      C              c;
      RCP<C> c_ptr = rcp(&c,false);
      

   6. Copy constructor (implicit casting)

      RCP<C>       c_ptr  = rcp(new C); // No cast
      RCP<A>       a_ptr  = c_ptr;      // Cast to base class
      RCP<const A> ca_ptr = a_ptr;      // Cast from non-const to const
      

   7. Representing constantness and non-constantness
      1. Non-constant pointer to non-constant object

         RCP<C> c_ptr;
         

      2. Constant pointer to non-constant object

         const RCP<C> c_ptr;
         

      3. Non-Constant pointer to constant object

         RCP<const C> c_ptr;
         

      4. Constant pointer to constant object

         const RCP<const C> c_ptr;
         

2. Reinitialization of RCP<> objects (using assignment operator)
   1. Resetting from a raw pointer

      RCP<A> a_ptr;
      a_ptr = rcp(new C());
      

   2. Resetting to null

      RCP<A> a_ptr = rcp(new C());
      a_ptr = null; // The C object will be deleted here
      

   3. Assigning from a RCP<> object

      RCP<A> a_ptr1;
      RCP<A> a_ptr2 = rcp(new C());
      a_ptr1 = a_ptr2; // Now a_ptr1 and a_ptr2 point to same C object
      

3. Accessing the reference-counted object
   1. Access to object reference (debug runtime checked) : Teuchos::RCP::operator*()

      C &c_ref = *c_ptr;
      

   2. Access to object pointer (unchecked, may return NULL) : Teuchos::RCP::get()

      C *c_rptr = c_ptr.get();
      

   3. Access to object pointer (debug runtime checked, will not return NULL) : Teuchos::RCP::operator*()

      C *c_rptr = &*c_ptr;
      

   4. Access of object's member (debug runtime checked) : Teuchos::RCP::operator->()

      c_ptr->f();
      

   5. Testing for non-null : Teuchos::RCP::get(), Teuchos::operator==(), Teuchos::operator!=()

      if( a_ptr.get() ) std::cout << "a_ptr is not null!\n";
      

      or

      if( a_ptr != null ) std::cout << "a_ptr is not null!\n";
      

      or

   6. Testing for null

      if( !a_ptr.get() ) std::cout << "a_ptr is null!\n";
      

      or

      if( a_ptr == null ) std::cout << "a_ptr is null!\n";
      

      or

      if( is_null(a_ptr) ) std::cout << "a_ptr is null!\n";
      

4. Casting
   1. Implicit casting (see copy constructor above)
      1. Using copy constructor (see above)

      2. Using conversion function

         RCP<C>       c_ptr  = rcp(new C);                       // No cast
         RCP<A>       a_ptr  = rcp_implicit_cast<A>(c_ptr);      // To base
         RCP<const A> ca_ptr = rcp_implicit_cast<const A>(a_ptr);// To const
         

   2. Casting away const : rcp_const_cast()

      RCP<const A>  ca_ptr = rcp(new C);
      RCP<A>        a_ptr  = rcp_const_cast<A>(ca_ptr); // cast away const!
      

   3. Static cast (no runtime check) : rcp_static_cast()

      RCP<D>     d_ptr = rcp(new E);
      RCP<E>     e_ptr = rcp_static_cast<E>(d_ptr); // Unchecked, unsafe?
      

   4. Dynamic cast (runtime checked, failed cast allowed) : rcp_dynamic_cast()

      RCP<A>     a_ptr  = rcp(new C);
      RCP<B1>    b1_ptr = rcp_dynamic_cast<B1>(a_ptr);  // Checked, safe!
      RCP<B2>    b2_ptr = rcp_dynamic_cast<B2>(b1_ptr); // Checked, safe!
      RCP<C>     c_ptr  = rcp_dynamic_cast<C>(b2_ptr);  // Checked, safe!
      

   5. Dynamic cast (runtime checked, failed cast not allowed) : rcp_dynamic_cast()

      RCP<A>     a_ptr1  = rcp(new C);
      RCP<A>     a_ptr2  = rcp(new A);
      RCP<B1>    b1_ptr1 = rcp_dynamic_cast<B1>(a_ptr1,true);  // Success!
      RCP<B1>    b1_ptr2 = rcp_dynamic_cast<B1>(a_ptr2,true);  // Throw std::bad_cast!
      

5. Customized deallocators
   1. Creating a RCP<> object with a custom deallocator : Teuchos::DeallocArrayDelete

      RCP<C> c_ptr = rcp(new C[N],DeallocArrayDelete<C>(),true);
      

   2. Access customized deallocator (runtime checked, throws on failure) : Teuchos::get_dealloc()

      const DeallocArrayDelete<C>
        &dealloc = get_dealloc<DeallocArrayDelete<C> >(c_ptr);
      

   3. Access optional customized deallocator : Teuchos::get_optional_dealloc()

      const DeallocArrayDelete<C>
        *dealloc = get_optional_dealloc<DeallocArrayDelete<C> >(c_ptr);
      if(dealloc) std::cout << "This deallocator exits!\n";
      

6. Managing extra data
   1. Adding extra data (post destruction of extra data) : Teuchos::set_extra_data()

      set_extra_data(rcp(new B1),"A:B1",&a_ptr);
      

   2. Adding extra data (pre destruction of extra data) : Teuchos::get_extra_data()

      set_extra_data(rcp(new B1),"A:B1",&a_ptr,PRE_DESTORY);
      

   3. Retrieving extra data : Teuchos::get_extra_data()

      get_extra_data<RCP<B1> >(a_ptr,"A:B1")->f();
      

   4. Resetting extra data : Teuchos::get_extra_data()

      get_extra_data<RCP<B1> >(a_ptr,"A:B1") = rcp(new C);
      

   5. Retrieving optional extra data : Teuchos::get_optional_extra_data()

      const RCP<B1>
        *b1 = get_optional_extra_data<RCP<B1> >(a_ptr,"A:B1");
      if(b1) (*b1)->f();
      

Examples:

FancyOutputting_test.cpp, ParameterList/cxx_main.cpp, and TimeMonitor/cxx_main.cpp.

Definition at line 403 of file Teuchos_RCPDecl.hpp.

---

Member Typedef Documentation

template<class T>

typedef T Teuchos::RCP< T >::element_type

Definition at line 406 of file Teuchos_RCPDecl.hpp.

---

Constructor & Destructor Documentation

template<class T>

Teuchos::RCP< T >::RCP

(

ENull

null_arg = null

)

Initialize RCP<T> to NULL.

This allows clients to write code like:

   RCP<int> p = null;

or

   RCP<int> p;

and construct to NULL

template<class T>

Teuchos::RCP< T >::RCP	(	T *	p,
		bool	has_ownership = false
	)			[explicit]

Construct from a raw pointer.

Note that this constructor is declared explicit so there is no implicit conversion from a raw pointer to an RCP allowed. If has_ownership==false, then no attempt to delete the object will occur.

Postconditons:

• this->get() == p
• this->count() == 1
• this->has_ownership() == has_ownership

template<class T>

Teuchos::RCP< T >::RCP

(

const RCP< T > &

r_ptr

)

Initialize from another RCP<T> object.

After construction, this and r_ptr will reference the same object.

This form of the copy constructor is required even though the below more general templated version is sufficient since some compilers will generate this function automatically which will give an incorrect implementation.

Postconditons:

• this->get() == r_ptr.get()
• this->count() == r_ptr.count()
• this->has_ownership() == r_ptr.has_ownership()
• If r_ptr.get() != NULL then r_ptr.count() is incremented by 1

template<class T>

template<class T2>

Teuchos::RCP< T >::RCP

(

const RCP< T2 > &

r_ptr

)

Initialize from another RCP<T2> object (implicit conversion only).

This function allows the implicit conversion of smart pointer objects just like with raw C++ pointers. Note that this function will only compile if the statement T1 *ptr = r_ptr.get() will compile.

Postconditons:

• this->get() == r_ptr.get()
• this->count() == r_ptr.count()
• this->has_ownership() == r_ptr.has_ownership()
• If r_ptr.get() != NULL then r_ptr.count() is incremented by 1

template<class T>

Teuchos::RCP< T >::~RCP

(

)

Removes a reference to a dynamically allocated object and possibly deletes the object if owned.

Deletes the object if this->has_ownership() == true and this->count() == 1. If this->count() == 1 but this->has_ownership() == false then the object is not deleted. If this->count() > 1 then the internal reference count shared by all the other related RCP<...> objects for this shared object is deincremented by one. If this->get() == NULL then nothing happens.

---

Member Function Documentation

template<class T>

RCP<T>& Teuchos::RCP< T >::operator=

(

const RCP< T > &

r_ptr

)

Copy the pointer to the referenced object and increment the reference count.

If this->has_ownership() == true and this->count() == 1 before this operation is called, then the object pointed to by this->get() will be deleted (usually using delete) prior to binding to the pointer (possibly NULL) pointed to in r_ptr. Assignment to self (i.e. this->get() == r_ptr.get()) is harmless and this function does nothing.

Postconditons:

• this->get() == r_ptr.get()
• this->count() == r_ptr.count()
• this->has_ownership() == r_ptr.has_ownership()
• If r_ptr.get() != NULL then r_ptr.count() is incremented by 1

template<class T>

T* Teuchos::RCP< T >::operator->

(

)

const

Pointer (->) access to members of underlying object.

Preconditions:

• this->get() != NULL (throws std::logic_error)

template<class T>

T& Teuchos::RCP< T >::operator *

(

)

const

Dereference the underlying object.

Preconditions:

• this->get() != NULL (throws std::logic_error)

template<class T>

T* Teuchos::RCP< T >::get

(

)

const

Get the raw C++ pointer to the underlying object.

template<class T>

T* Teuchos::RCP< T >::release

(

)

Release the ownership of the underlying dynamically allocated object.

After this function is called then the client is responsible for deallocating the shared object no matter how many ref_count_prt<T> objects have a reference to it. If this->get()== NULL, then this call is meaningless.

Note that this function does not have the exact same semantics as does auto_ptr<T>::release(). In auto_ptr<T>::release(), this is set to NULL while here in RCP<T>:: release() only an ownership flag is set and *this still points to the same object. It would be difficult to duplicate the behavior of auto_ptr<T>::release() for this class.

Postconditions:

• this->has_ownership() == false

Returns:

Returns the value of this->get()

template<class T>

int Teuchos::RCP< T >::count

(

)

const

Return the number of RCP<> objects that have a reference to the underlying pointer that is being shared.

Returns:

If this->get() == NULL then this function returns 0. Otherwise, this function returns 0.

template<class T>

void Teuchos::RCP< T >::set_has_ownership

(

)

Give this and other RCP<> objects ownership of the referenced object this->get().

See ~RCP() above. This function does nothing if this->get() == NULL.

Postconditions:

• If this->get() == NULL then
  • this->has_ownership() == false (always!).
• else
  • this->has_ownership() == true

template<class T>

bool Teuchos::RCP< T >::has_ownership

(

)

const

Returns true if this has ownership of object pointed to by this->get() in order to delete it.

See ~RCP() above.

Returns:

If this->get() == NULL then this function always returns false. Otherwise the value returned from this function depends on which function was called most recently, if any; set_has_ownership() (true) or release() (false).

template<class T>

template<class T2>

bool Teuchos::RCP< T >::shares_resource

(

const RCP< T2 > &

r_ptr

)

const

Returns true if the smart pointers share the same underlying reference-counted object.

This method does more than just check if this->get() == r_ptr.get(). It also checks to see if the underlying reference counting machinary is the same.

template<class T>

const RCP<T>& Teuchos::RCP< T >::assert_not_null

(

)

const

Throws std::logic_error if this->get()==NULL, otherwise returns reference to *this.

---

Friends And Related Function Documentation

template<class T>

enum ENull [related]

Used to initialize a RCP object to NULL using an implicit conversion!

Definition at line 59 of file Teuchos_RCPDecl.hpp.

template<class T>

enum EPrePostDestruction [related]

Used to specify a pre or post destruction of extra data.

Definition at line 65 of file Teuchos_RCPDecl.hpp.

template<class T>

RCP< T > rcp	(	T *	p,
		bool	owns_mem = true
	)			[related]

Create a RCP object properly typed.

Parameters:

	p	[in] Pointer to an object to be reference counted.
	owns_mem	[in] If owns_mem==true then delete p will be called when the last reference to this object is removed. If owns_mem==false then nothing will happen to delete the the object pointed to by p when the last reference is removed.

Preconditions:

• If owns_mem==true then p must have been created by calling new to create the object since delete p will be called eventually.

If the pointer p did not come from new then either the client should use the version of rcp() that that uses a deallocator policy object or should pass in owns_mem = false.

template<class T>

RCP< T > rcp	(	T *	p,
		Dealloc_T	dealloc,
		bool	owns_mem
	)			[related]

Initialize from a raw pointer with a deallocation policy.

Parameters:

	p	[in] Raw C++ pointer that this will represent.
	dealloc	[in] Deallocator policy object (copied by value) that defines a function void Dealloc_T::free(T* p) that will free the underlying object.
	owns_mem	[in] If true then return is allowed to delete the underlying pointer by calling dealloc.free(p). when all references have been removed.

Preconditions:

• The function void Dealloc_T::free(T* p) exists.

Postconditions:

• return.get() == p
• If p == NULL then
  • return.count() == 0
  • return.has_ownership() == false
• else
  • return.count() == 1
  • return.has_ownership() == owns_mem

By default, return has ownership to delete the object pointed to by p when return is deleted (see ~RCP()). If owns_mem==true, it is vital that the address p passed in is the same address that was returned by new. With multiple inheritance this is not always the case. See the above discussion. This class is templated to accept a deallocator object that will free the pointer. The other functions use a default deallocator of type DeallocDelete which has a method DeallocDelete::free() which just calls delete p.

template<class T>

bool is_null

(

const RCP< T > &

p

)

[related]

Returns true if p.get()==NULL.

template<class T>

bool operator==	(	const RCP< T > &	p,
		ENull
	)			[related]

Returns true if p.get()==NULL.

template<class T>

bool operator!=	(	const RCP< T > &	p,
		ENull
	)			[related]

Returns true if p.get()!=NULL.

template<class T>

bool operator==	(	const RCP< T1 > &	p1,
		const RCP< T2 > &	p2
	)			[related]

Return true if two RCP objects point to the same referenced-counted object and have the same node.

template<class T>

bool operator!=	(	const RCP< T1 > &	p1,
		const RCP< T2 > &	p2
	)			[related]

Return true if two RCP objects do not point to the same referenced-counted object and have the same node.

template<class T>

RCP< T2 > rcp_implicit_cast

(

const RCP< T1 > &

p1

)

[related]

Implicit cast of underlying RCP type from T1* to T2*.

The function will compile only if (T2* p2 = p1.get();) compiles.

This is to be used for conversions up an inheritance hierarchy and from non-const to const and any other standard implicit pointer conversions allowed by C++.

template<class T>

RCP< T2 > rcp_static_cast

(

const RCP< T1 > &

p1

)

[related]

Static cast of underlying RCP type from T1* to T2*.

The function will compile only if (static_cast<T2*>(p1.get());) compiles.

This can safely be used for conversion down an inheritance hierarchy with polymorphic types only if dynamic_cast<T2>(p1.get()) == static_cast<T2>(p1.get()). If not then you have to use rcp_dynamic_cast<T2>(p1).

template<class T>

RCP< T2 > rcp_const_cast

(

const RCP< T1 > &

p1

)

[related]

Constant cast of underlying RCP type from T1* to T2*.

This function will compile only if (const_cast<T2*>(p1.get());) compiles.

template<class T>

RCP< T2 > rcp_dynamic_cast	(	const RCP< T1 > &	p1,
		bool	throw_on_fail = false
	)			[related]

Dynamic cast of underlying RCP type from T1* to T2*.

Parameters:

	p1	[in] The smart pointer casting from
	throw_on_fail	[in] If true then if the cast fails (for p1.get()!=NULL) then a std::bad_cast std::exception is thrown with a very informative error message.

Postconditions:

• If ( p1.get()!=NULL && throw_on_fail==true && dynamic_cast<T2*>(p1.get())==NULL ) == true then an std::bad_cast std::exception is thrown with a very informative error message.
• If ( p1.get()!=NULL && dynamic_cast<T2*>(p1.get())!=NULL ) == true then return.get() == dynamic_cast<T2*>(p1.get()).
• If ( p1.get()!=NULL && throw_on_fail==false && dynamic_cast<T2*>(p1.get())==NULL ) == true then return.get() == NULL.
• If ( p1.get()==NULL ) == true then return.get() == NULL.

This function will compile only if (dynamic_cast<T2*>(p1.get());) compiles.

template<class T>

void set_extra_data	(	const T1 &	extra_data,
		const std::string &	name,
		RCP< T2 > *	p,
		EPrePostDestruction	destroy_when = POST_DESTROY,
		bool	force_unique = true
	)			[related]

Set extra data associated with a RCP object.

Parameters:

	extra_data	[in] Data object that will be set (copied)
	name	[in] The name given to the extra data. The value of name together with the data type T1 of the extra data must be unique from any other such data or the other data will be overwritten.
	p	[out] On output, will be updated with the input extra_data
	destroy_when	[in] Determines when extra_data will be destoryed in relation to the underlying reference-counted object. If destroy_when==PRE_DESTROY then extra_data will be deleted before the underlying reference-counted object. If destroy_when==POST_DESTROY (the default) then extra_data will be deleted after the underlying reference-counted object.
	force_unique	[in] Determines if this type and name pair must be unique in which case if an object with this same type and name already exists, then an std::exception will be thrown. The default is true for safety.

If there is a call to this function with the same type of extra data T1 and same arguments p and name has already been made, then the current piece of extra data already set will be overwritten with extra_data. However, if the type of the extra data T1 is different, then the extra data can be added and not overwrite existing extra data. This means that extra data is keyed on both the type and name. This helps to minimize the chance that clients will unexpectedly overwrite data by accident.

When the last RefcountPtr object is removed and the reference-count node is deleted, then objects are deleted in the following order: (1) All of the extra data that where added with destroy_when==PRE_DESTROY are first, (2) then the underlying reference-counted object is deleted, and (3) the rest of the extra data that was added with destroy_when==PRE_DESTROY is then deleted. The order in which the objects are destroyed is not guaranteed. Therefore, clients should be careful not to add extra data that has deletion dependancies (instead consider using nested RCP objects as extra data which will guarantee the order of deletion).

Preconditions:

• p->get() != NULL (throws std::logic_error)
• If this function has already been called with the same template type T1 for extra_data and the same std::string name and force_unique==true, then an std::invalid_argument std::exception will be thrown.

Note, this function is made a non-member function to be consistent with the non-member get_extra_data() functions.

template<class T>

T1 & get_extra_data	(	RCP< T2 > &	p,
		const std::string &	name
	)			[related]

Get a non-const reference to extra data associated with a RCP object.

Parameters:

	p	[in] Smart pointer object that extra data is being extraced from.
	name	[in] Name of the extra data.

Returns:

Returns a non-const reference to the extra_data object.

Preconditions:

• p.get() != NULL (throws std::logic_error)
• name and T1 must have been used in a previous call to set_extra_data() (throws std::invalid_argument).

Note, this function must be a non-member function since the client must manually select the first template argument.

template<class T>

const T1 & get_extra_data	(	const RCP< T2 > &	p,
		const std::string &	name
	)			[related]

Get a const reference to extra data associated with a RCP object.

Parameters:

	p	[in] Smart pointer object that extra data is being extraced from.
	name	[in] Name of the extra data.

Returns:

Returns a const reference to the extra_data object.

Preconditions:

• p.get() != NULL (throws std::logic_error)
• name and T1 must have been used in a previous call to set_extra_data() (throws std::invalid_argument).

Note, this function must be a non-member function since the client must manually select the first template argument.

Also note that this const version is a false sense of security since a client can always copy a const RCP object into a non-const object and then use the non-const version to change the data. However, its presence will help to avoid some types of accidental changes to this extra data.

template<class T>

T1 * get_optional_extra_data	(	RCP< T2 > &	p,
		const std::string &	name
	)			[related]

Get a pointer to non-const extra data (if it exists) associated with a RCP object.

Parameters:

	p	[in] Smart pointer object that extra data is being extraced from.
	name	[in] Name of the extra data.

Returns:

Returns a non-const pointer to the extra_data object.

Preconditions:

• p.get() != NULL (throws std::logic_error)

Postconditions:

• If name and T1 have been used in a previous call to set_extra_data() then return !=NULL and otherwise return == NULL.

Note, this function must be a non-member function since the client must manually select the first template argument.

template<class T>

const T1 * get_optional_extra_data	(	const RCP< T2 > &	p,
		const std::string &	name
	)			[related]

Get a pointer to const extra data (if it exists) associated with a RCP object.

Parameters:

	p	[in] Smart pointer object that extra data is being extraced from.
	name	[in] Name of the extra data.

Returns:

Returns a const pointer to the extra_data object if it exists.

Preconditions:

• p.get() != NULL (throws std::logic_error)

Postconditions:

• If name and T1 have been used in a previous call to set_extra_data() then return !=NULL and otherwise return == NULL.

Note, this function must be a non-member function since the client must manually select the first template argument.

Also note that this const version is a false sense of security since a client can always copy a const RCP object into a non-const object and then use the non-const version to change the data. However, its presence will help to avoid some types of accidental changes to this extra data.

template<class T>

Dealloc_T & get_dealloc

(

RCP< T > &

p

)

[related]

Return a non-const reference to the underlying deallocator object.

Preconditions:

• p.get() != NULL (throws std::logic_error)
• The deallocator object type used to construct p is same as Dealloc_T (throws std::logic_error)

template<class T>

const Dealloc_T & get_dealloc

(

const RCP< T > &

p

)

[related]

Return a const reference to the underlying deallocator object.

Preconditions:

• p.get() != NULL (throws std::logic_error)
• The deallocator object type used to construct p is same as Dealloc_T (throws std::logic_error)

Note that the const version of this function provides only a very ineffective attempt to avoid accidental changes to the deallocation object. A client can always just create a new non-const RCP<T> object from any const RCP<T> object and then call the non-const version of this function.

template<class T>

Dealloc_T * get_optional_dealloc

(

RCP< T > &

p

)

[related]

Return a pointer to the underlying non-const deallocator object if it exists.

Preconditions:

• p.get() != NULL (throws std::logic_error)

Postconditions:

• If the deallocator object type used to construct p is same as Dealloc_T then return!=NULL, otherwise return==NULL

template<class T>

const Dealloc_T * get_optional_dealloc

(

const RCP< T > &

p

)

[related]

Return a pointer to the underlying const deallocator object if it exists.

Preconditions:

• p.get() != NULL (throws std::logic_error)

Postconditions:

• If the deallocator object type used to construct p is same as Dealloc_T then return!=NULL, otherwise return==NULL

Note that the const version of this function provides only a very ineffective attempt to avoid accidental changes to the deallocation object. A client can always just create a new non-const RCP<T> object from any const RCP<T> object and then call the non-const version of this function.

template<class T>

std::ostream & operator<<	(	std::ostream &	out,
		const RCP< T > &	p
	)			[related]

Output stream inserter.

The implementation of this function just print pointer addresses and therefore puts not restrictions on the data types involved.

template<class T>

void print_active_RCP_nodes

(

std::ostream &

out

)

[related]

Print the list of currently active RCP nodes.

When the macro TEUCHOS_SHOW_ACTIVE_REFCOUNTPTR_NODE_TRACE is defined, this function will print out all of the RCP nodes that are currently active. This function can be called at any time during a program.

When the macro TEUCHOS_SHOW_ACTIVE_REFCOUNTPTR_NODE_TRACE is defined this function will get called automatically after the program ends and all of the local and global RCP objects have been destroyed. If any RCP nodes are printed at that time, then this is an indication that there may be some circular references that will caused memory leaks. You memory checking tool such as valgrind or purify should complain about this!

Definition at line 224 of file Teuchos_RCP.cpp.

---

The documentation for this class was generated from the following file:

• Teuchos_RCPDecl.hpp

---