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Public Member Functions | Data Fields
Tactic Class Reference

Public Member Functions

def __init__
 
def __del__
 
def solver
 
def apply
 
def __call__
 
def help
 
def param_descrs
 

Data Fields

 ctx
 
 tactic
 

Detailed Description

Tactics transform, solver and/or simplify sets of constraints (Goal). A Tactic can be converted into a Solver using the method solver().

Several combinators are available for creating new tactics using the built-in ones: Then(), OrElse(), FailIf(), Repeat(), When(), Cond().

Definition at line 6656 of file z3py.py.

Constructor & Destructor Documentation

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 6661 of file z3py.py.

6661 
6662  def __init__(self, tactic, ctx=None):
6663  self.ctx = _get_ctx(ctx)
6664  self.tactic = None
6665  if isinstance(tactic, TacticObj):
6666  self.tactic = tactic
6667  else:
6668  if __debug__:
6669  _z3_assert(isinstance(tactic, str), "tactic name expected")
6670  try:
6671  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
6672  except Z3Exception:
6673  raise Z3Exception("unknown tactic '%s'" % tactic)
6674  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
Z3_tactic_inc_ref
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given tactic.
Z3_mk_tactic
Z3_tactic Z3_API Z3_mk_tactic(Z3_context c, Z3_string name)
Return a tactic associated with the given name. The complete list of tactics may be obtained using th...
z3py.Tactic.__init__
def __init__
Definition: z3py.py:6661
def __del__ (   self)

Definition at line 6675 of file z3py.py.

6675 
6676  def __del__(self):
6677  if self.tactic != None:
6678  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
z3py.Tactic.__del__
def __del__
Definition: z3py.py:6675
Z3_tactic_dec_ref
void Z3_API Z3_tactic_dec_ref(Z3_context c, Z3_tactic g)
Decrement the reference counter of the given tactic.

Member Function Documentation

def __call__ (   self,
  goal,
  arguments,
  keywords 
) 
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 6713 of file z3py.py.

6713 
6714  def __call__(self, goal, *arguments, **keywords):
6715  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
6716 
6717  >>> x, y = Ints('x y')
6718  >>> t = Tactic('solve-eqs')
6719  >>> t(And(x == 0, y >= x + 1))
6720  [[y >= 1]]
6721  """
6722  return self.apply(goal, *arguments, **keywords)
z3py.Tactic.apply
def apply
Definition: z3py.py:6696
z3py.Tactic.__call__
def __call__
Definition: z3py.py:6713
def apply (   self,
  goal,
  arguments,
  keywords 
) 
Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.

>>> x, y = Ints('x y')
>>> t = Tactic('solve-eqs')
>>> t.apply(And(x == 0, y >= x + 1))
[[y >= 1]]

Definition at line 6696 of file z3py.py.

Referenced by Tactic.__call__().

6696 
6697  def apply(self, goal, *arguments, **keywords):
6698  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
6699 
6700  >>> x, y = Ints('x y')
6701  >>> t = Tactic('solve-eqs')
6702  >>> t.apply(And(x == 0, y >= x + 1))
6703  [[y >= 1]]
6704  """
6705  if __debug__:
6706  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
6707  goal = _to_goal(goal)
6708  if len(arguments) > 0 or len(keywords) > 0:
6709  p = args2params(arguments, keywords, self.ctx)
6710  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
6711  else:
6712  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
Z3_tactic_apply
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.
z3py.args2params
def args2params
Definition: z3py.py:4527
z3py.Tactic.apply
def apply
Definition: z3py.py:6696
Z3_tactic_apply_ex
Z3_apply_result Z3_API Z3_tactic_apply_ex(Z3_context c, Z3_tactic t, Z3_goal g, Z3_params p)
Apply tactic t to the goal g using the parameter set p.
def help (   self) 
Display a string containing a description of the available options for the `self` tactic.

Definition at line 6723 of file z3py.py.

6723 
6724  def help(self):
6725  """Display a string containing a description of the available options for the `self` tactic."""
6726  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
z3py.Tactic.help
def help
Definition: z3py.py:6723
Z3_tactic_get_help
Z3_string Z3_API Z3_tactic_get_help(Z3_context c, Z3_tactic t)
Return a string containing a description of parameters accepted by the given tactic.
def param_descrs (   self) 
Return the parameter description set.

Definition at line 6727 of file z3py.py.

6727 
6728  def param_descrs(self):
6729  """Return the parameter description set."""
6730  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
Z3_tactic_get_param_descrs
Z3_param_descrs Z3_API Z3_tactic_get_param_descrs(Z3_context c, Z3_tactic t)
Return the parameter description set for the given tactic object.
z3py.Tactic.param_descrs
def param_descrs
Definition: z3py.py:6727
def solver (   self) 
Create a solver using the tactic `self`.

The solver supports the methods `push()` and `pop()`, but it
will always solve each `check()` from scratch.

>>> t = Then('simplify', 'nlsat')
>>> s = t.solver()
>>> x = Real('x')
>>> s.add(x**2 == 2, x > 0)
>>> s.check()
sat
>>> s.model()
[x = 1.4142135623?]

Definition at line 6679 of file z3py.py.

6679 
6680  def solver(self):
6681  """Create a solver using the tactic `self`.
6682 
6683  The solver supports the methods `push()` and `pop()`, but it
6684  will always solve each `check()` from scratch.
6685 
6686  >>> t = Then('simplify', 'nlsat')
6687  >>> s = t.solver()
6688  >>> x = Real('x')
6689  >>> s.add(x**2 == 2, x > 0)
6690  >>> s.check()
6691  sat
6692  >>> s.model()
6693  [x = 1.4142135623?]
6694  """
6695  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx)
z3py.Tactic.solver
def solver
Definition: z3py.py:6679
Z3_mk_solver_from_tactic
Z3_solver Z3_API Z3_mk_solver_from_tactic(Z3_context c, Z3_tactic t)
Create a new solver that is implemented using the given tactic. The solver supports the commands Z3_s...

Field Documentation

ctx

Definition at line 6662 of file z3py.py.

Referenced by Probe.__eq__(), Probe.__ge__(), Probe.__gt__(), Probe.__le__(), Probe.__lt__(), Probe.__ne__(), Tactic.apply(), Tactic.param_descrs(), and Tactic.solver().

tactic

Definition at line 6663 of file z3py.py.

Referenced by Tactic.__del__(), Tactic.apply(), Tactic.help(), Tactic.param_descrs(), and Tactic.solver().

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