Bailout class for R commands 'break' and 'next'. More...

#include <LoopBailout.hpp>

Inheritance diagram for CXXR::LoopBailout:

Collaboration diagram for CXXR::LoopBailout:

Public Member Functions
	LoopBailout (Environment *the_environment, bool next_iteration)
	Constructor.
Environment *	environment () const
	Target Environment of this LoopBailout.
bool	next () const
	Continue with next iteration of the loop (if any)?
void	throwException ()
	Throw the corresponding C++ exception.
void	visitReferents (const_visitor *v) const
	Conduct a visitor to the nodes referred to by this one.
Public Member Functions inherited from CXXR::Bailout
	Bailout ()
	Default constructor.
Public Member Functions inherited from CXXR::RObject
virtual const PairList *	attributes () const
	Get object attributes.
virtual void	clearAttributes ()
	Remove all attributes.
virtual RObject *	clone () const
	Return pointer to a copy of this object.
void	copyAttribute (const Symbol name, const RObject source)
	Copy an attribute from one RObject to another.
void	copyAttributes (const RObject *source, bool copyS4)
	Copy attributes from one RObject to another.
virtual RObject *	evaluate (Environment *env)
	Evaluate object in a specified Environment.
virtual RObject *	getAttribute (const Symbol *name) const
	Get the value a particular attribute.
virtual bool	hasAttributes () const
	Has this object any attributes?
bool	hasClass () const
	Has this object the class attribute?
bool	isS4Object () const
	Is this an S4 object?
void	maybeTraceMemory (const RObject *src)
	Carry out memory tracing.
void	maybeTraceMemory (const RObject src1, const RObject src2)
	Carry out memory tracing.
void	maybeTraceMemory (const RObject src1, const RObject src2, const RObject *src3)
	Carry out memory tracing.
bool	memoryTraced () const
	Is copying etc. of this object being traced?
virtual unsigned int	packGPBits () const
	Reproduce the `gp` bits field used in CR.
virtual void	setAttribute (const Symbol name, RObject value)
	Set or remove an attribute.
void	setAttributes (const PairList *new_attributes)
	Replace the attributes of an object.
void	setMemoryTracing (bool on)
	Enable/disable tracing of copying etc.
void	setS4Object (bool on)
	Set the status of this RObject as an S4 object.
SEXPTYPE	sexptype () const
	Get an object's SEXPTYPE.
virtual const char *	typeName () const
	Name within R of this type of object.
virtual void	unpackGPBits (unsigned int gpbits)
	Interpret the `gp` bits field used in CR.
Public Member Functions inherited from CXXR::GCNode
void	expose () const
	Record that construction of a node is complete.
bool	isExposed () const
	Has this node been exposed to garbage collection?
Public Member Functions inherited from CXXR::HeterogeneousListBase::Link
	Link ()
	Default constructor.
	Link (HeterogeneousListBase *list)
	Appending constructor.
void	freeLink ()
	Detach Link from any list.

Protected Member Functions
void	detachReferents ()
	Null out all references from this node to other nodes.

Detailed Description

Bailout class for R commands 'break' and 'next'.

A Bailout of this class conveys a value back to a computation (typically a Closure application) operating within a specified working Environment, and is used for example to implement the R return command.

Constructor & Destructor Documentation

CXXR::LoopBailout::LoopBailout	(	Environment *	the_environment,
		bool	next_iteration
	)

inline

Constructor.

Parameters:

the_environment	Pointer to the working Environment of the computational context in which the relevant loop is executing.
next_iteration	true for 'next'; false for 'break'.

Member Function Documentation

void LoopBailout::detachReferents ( )

protectedvirtual

Null out all references from this node to other nodes.

The referents of this node are those objects (derived from GCNode) designated by a GCEdge within this object. This function changes all GCEdges within this object to encapsulate a null pointer. It is used during the sweep phase of a mark-sweep garbage collection to break up unreachable subgraphs, and in particular to remove reference loops from them. After the application of this method, the GCNode should be regarded as a 'zombie', kept in existence only so other nodes can detach their references to it cleanly (using decRefCount()).

Note:: If this method is reimplemented in a derived class, the reimplemented version must remember to invoke detachReferents() for the immediate base class of the derived class, to ensure that all referents of the object get detached.

Reimplemented from CXXR::RObject.

Environment* CXXR::LoopBailout::environment ( ) const

inline

Target Environment of this LoopBailout.

Returns:: pointer to the Environment within which this LoopBailout should be caught.

bool CXXR::LoopBailout::next ( ) const

inline

Continue with next iteration of the loop (if any)?

Returns:: true if this LoopException arose from the R 'next' command; false if it arose from 'break'.

void LoopBailout::visitReferents ( const_visitor * v ) const

virtual

Conduct a visitor to the nodes referred to by this one.

The referents of this node are those objects (derived from GCNode) designated by a GCEdge within this object.

Parameters:

v	Pointer to the visitor object.

Note:: If this method is reimplemented in a derived class, the reimplemented version must remember to invoke visitReferents() for the immediate base class of the derived class, to ensure that all referents of the object get visited. It is suggested that implementations set up stack-based pointers to all the referents of a node before visiting any of them; in that case, if the (recursive) visiting pushes the node out of the processor cache, there is no need to fetch it back in.

Reimplemented from CXXR::RObject.

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

Public Member Functions

Protected Member Functions

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation