Identity Class Reference

Inheritance diagram for Identity:

Collaboration diagram for Identity:

Public Member Functions
	Identity (int ref=0)
bool	operator== (const _GHom &) const
	Comparator. More...
size_t	hash () const
	Hash key computation. More...
_GHom *	clone () const
bool	skip_variable (int) const
	The skip_variable predicate indicates which variables are "don't care" with respect to this SHom. More...
bool	is_selector () const
	The isSelector predicate indicates a homomorphism that only selects paths in the SDD (no modifications, no additions) Tagging with isSelector() allows to enable optimizations and makes the homomorphism eligible as "condition" in ITE construct. More...
GDDD	has_image (const GDDD &d) const
GHom	negate () const
	returns a negation of a selector homomorphism h, such that h.negate() (d) = d - h(d) More...
GHom	invert (const GDDD &pot) const
	returns the predescessor homomorphism, using pot to determine variable domains More...
void	print (std::ostream &os) const
GDDD	eval (const GDDD &d) const
	The computation function responsible for evaluation over a node. More...
GDDD	has_image_skip (const GDDD &) const
virtual const GHom::range_t	get_range () const
	The range returns the dual of skip_variable, default implem considers that all variables are affected by this homomorphism. More...
bool	operator< (const _GHom &h) const
	Ordering between _GHom. It is the chronological ordering of creation. More...
virtual void	mark () const
	For garbage collection. Used in first phase of garbage collection. More...
virtual GHom	compose (const GHom &r) const

Static Public Member Functions
static const _GHom *	get_concret (const GHom &ghom)

Private Member Functions
GDDD	eval_skip (const GDDD &) const

Private Attributes
int	refCounter
	For garbage collection. More...
bool	marking
	For garbage collection. More...
bool	immediat
	For operation cache management. More...
size_t	creation_counter
	Counter of objects created (see constructors). More...

Constructor & Destructor Documentation

Identity()

Identity::Identity ( int  ref = 0 )

inline

Referenced by clone().

Member Function Documentation

clone()

_GHom* Identity::clone ( ) const

inlinevirtual

Implements _GHom.

References Identity().

compose()

GHom _GHom::compose ( const GHom &  r ) const

virtualinherited

Reimplemented in _VarCompVar, and _VarCompState.

References GHom::id, and GDDD::null.

Referenced by _VarCompState::compose(), _VarCompVar::compose(), and GHom::compose().

eval()

GDDD Identity::eval ( const GDDD &  ) const

inlinevirtual

The computation function responsible for evaluation over a node.

Users should not directly use this. Normal behavior is to use GShom::operator() that encapsulates this call with operation caching.

Implements _GHom.

eval_skip()

GDDD _GHom::eval_skip ( const GDDD &  d ) const

privateinherited

References GDDD::begin(), GDDD::end(), _GHom::eval(), GHom::id, GDDD::null, GDDD::one, _GHom::skip_variable(), GDDD::top, and GDDD::variable().

Referenced by GHom::eval().

get_concret()

static const _GHom* _GHom::get_concret ( const GHom &  ghom )

inlinestaticinherited

References GHom::concret.

Referenced by Add::Add(), addCompositionParameter(), _VarCompState::compose(), _VarCompVar::compose(), And::eval(), Fixpoint::eval(), Fixpoint::has_image(), Inter::skip_variable(), NotCond::skip_variable(), Add::skip_variable(), Monotonic::skip_variable(), Compose::skip_variable(), RightConcat::skip_variable(), and Fixpoint::skip_variable().

get_range()

virtual const GHom::range_t _GHom::get_range ( ) const

inlinevirtualinherited

The range returns the dual of skip_variable, default implem considers that all variables are affected by this homomorphism.

Reimplemented in _VarCompVar, _incVar, _setVarConst, _VarCompState, Fixpoint, And, Compose, Monotonic, Add, and NotCond.

References GHom::full_range.

Referenced by GHom::get_range().

has_image()

GDDD Identity::has_image ( const GDDD &  d ) const

inlinevirtual

Reimplemented from _GHom.

has_image_skip()

GDDD _GHom::has_image_skip ( const GDDD &  d ) const

inherited

References GDDD::begin(), GDDD::end(), _GHom::has_image(), GHom::has_image(), GHom::id, GDDD::null, GDDD::one, _GHom::skip_variable(), GDDD::top, and GDDD::variable().

hash()

size_t Identity::hash ( ) const

inlinevirtual

Hash key computation.

It is essential for good hash table operation that the spread of the keys be as good as possible. Also, fast hash key computation is a good design goal. Note that bad hash functions will yield more collisions, thus equality comparisons which may be quite costly.

Implements _GHom.

invert()

GHom Identity::invert ( const GDDD &  ) const

inlinevirtual

returns the predescessor homomorphism, using pot to determine variable domains

Reimplemented from _GHom.

is_selector()

bool Identity::is_selector ( ) const

inlinevirtual

The isSelector predicate indicates a homomorphism that only selects paths in the SDD (no modifications, no additions) Tagging with isSelector() allows to enable optimizations and makes the homomorphism eligible as "condition" in ITE construct.

Reimplemented from _GHom.

mark()

virtual void _GHom::mark ( ) const

inlinevirtualinherited

For garbage collection. Used in first phase of garbage collection.

Reimplemented in MLHomAdapter, Fixpoint, Minus, RightConcat, LeftConcat, And, Compose, Monotonic, Add, NotCond, Inter, Mult, Apply2k, and Constant.

Referenced by GHom::mark().

negate()

GHom Identity::negate ( ) const

inlinevirtual

returns a negation of a selector homomorphism h, such that h.negate() (d) = d - h(d)

Reimplemented from _GHom.

References _GHom::GHom, and GDDD::null.

operator<()

bool _GHom::operator< ( const _GHom &  h ) const

inherited

Ordering between _GHom. It is the chronological ordering of creation.

References _GHom::creation_counter.

operator==()

bool Identity::operator== ( const _GHom &  h ) const

inlinevirtual

Comparator.

Used in case of hash collision. Should be appropriately defined in derived classes, in particular in user defined homomorphisms.

Implements _GHom.

print()

void Identity::print ( std::ostream &  os ) const

inlinevirtual

Implements _GHom.

skip_variable()

bool Identity::skip_variable ( int  ) const

inlinevirtual

The skip_variable predicate indicates which variables are "don't care" with respect to this SHom.

This is defined as a StrongHom with : phi(var,val) { if ( skip_variable(var) ) return GShom( var, val, this ); else { real behavior } }

Reimplemented from _GHom.

Member Data Documentation

creation_counter

size_t _GHom::creation_counter

privateinherited

Counter of objects created (see constructors).

This is used for the ordering between homomorphisms.

Referenced by _GHom::_GHom(), and _GHom::operator<().

immediat

bool _GHom::immediat

mutableprivateinherited

For operation cache management.

If immediat==true, eval is called without attempting a cache hit. Currently only the constant homomorphism has this attribute set to true.

Referenced by GHom::operator()().

marking

bool _GHom::marking

mutableprivateinherited

For garbage collection.

Used in the two phase garbage collection process. A Hom that is not marked after the first pass over the unicity table, will be sweeped in the second phase. Outside of garbage collection routine, marking should always bear the value false.

Referenced by GHom::garbage(), and GHom::mark().

refCounter

int _GHom::refCounter

mutableprivateinherited

For garbage collection.

Counts the number of times a _GShom is referenced from the context of an Shom.

Referenced by Hom::Hom(), Hom::operator=(), GHom::refCounter(), and Hom::~Hom().

---

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

• Hom.cpp