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spot::state_union Class Reference

A state for spot::tgba_union. More...

#include <tgba/tgbaunion.hh>

Inheritance diagram for spot::state_union:
Inheritance graph
Collaboration diagram for spot::state_union:
Collaboration graph

Public Member Functions

 state_union (state *left, state *right)
 Constructor. More...
 
 state_union (const state_union &o)
 Copy constructor. More...
 
stateleft () const
 
stateright () const
 
virtual int compare (const state *other) const
 Compares two states (that come from the same automaton). More...
 
virtual size_t hash () const
 Hash a state. More...
 
virtual state_unionclone () const
 Duplicate a state. More...
 
virtual void destroy () const
 Release a state. More...
 

Detailed Description

A state for spot::tgba_union.

This state is in fact a pair. If the first member equals 0 and the second is different from 0, the state belongs to the left automaton. If the first member is different from 0 and the second is 0, the state belongs to the right automaton. If both members are 0, the state is the initial state.

Constructor & Destructor Documentation

spot::state_union::state_union ( state left,
state right 
)
inline

Constructor.

Parameters
leftThe state from the left automaton.
rightThe state from the right automaton. These states are acquired by spot::state_union, and will be destroyed on destruction.
spot::state_union::state_union ( const state_union o)

Copy constructor.

Member Function Documentation

virtual state_union* spot::state_union::clone ( ) const
virtual

Duplicate a state.

Implements spot::state.

virtual int spot::state_union::compare ( const state other) const
virtual

Compares two states (that come from the same automaton).

This method returns an integer less than, equal to, or greater than zero if this is found, respectively, to be less than, equal to, or greater than other according to some implicit total order.

This method should not be called to compare states from different automata.

See Also
spot::state_ptr_less_than

Implements spot::state.

virtual void spot::state::destroy ( ) const
inlinevirtualinherited

Release a state.

Methods from the tgba or tgba_succ_iterator always return a new state that you should deallocate with this function. Before Spot 0.7, you had to "delete" your state directly. Starting with Spot 0.7, you should update your code to use this function instead. destroy() usually call delete, except in subclasses that destroy() to allow better memory management (e.g., no memory allocation for explicit automata).

Reimplemented in spot::state_ta_explicit, spot::state_explicit< Label, label_hash >, spot::state_explicit< const ltl::formula *, ltl::formula_ptr_hash >, spot::state_explicit< int, identity_hash< int > >, spot::state_explicit< std::string, string_hash >, and spot::state_product.

virtual size_t spot::state_union::hash ( ) const
virtual

Hash a state.

This method returns an integer that can be used as a hash value for this state.

Note that the hash value is guaranteed to be unique for all equal states (in compare()'s sense) for only has long has one of these states exists. So it's OK to use a spot::state as a key in a hash_map because the mere use of the state as a key in the hash will ensure the state continues to exist.

However if you create the state, get its hash key, delete the state, recreate the same state, and get its hash key, you may obtain two different hash keys if the same state were not already used elsewhere. In practice this weird situation can occur only when the state is BDD-encoded, because BDD numbers (used to build the hash value) can be reused for other formulas. That probably doesn't matter, since the hash value is meant to be used in a hash_map, but it had to be noted.

Implements spot::state.


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

Please direct any question, comment, or bug report to the Spot mailing list at spot@lrde.epita.fr.
Generated on Sat Dec 6 2014 12:28:44 for spot by doxygen 1.8.4