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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 6434 of file z3py.py.

Constructor & Destructor Documentation

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 6439 of file z3py.py.

6440  def __init__(self, tactic, ctx=None):
6441  self.ctx = _get_ctx(ctx)
6442  self.tactic = None
6443  if isinstance(tactic, TacticObj):
6444  self.tactic = tactic
6445  else:
6446  if __debug__:
6447  _z3_assert(isinstance(tactic, str), "tactic name expected")
6448  try:
6449  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
6450  except Z3Exception:
6451  raise Z3Exception("unknown tactic '%s'" % tactic)
6452  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
Z3_tactic Z3_API Z3_mk_tactic(__in Z3_context c, __in Z3_string name)
Return a tactic associated with the given name. The complete list of tactics may be obtained using th...
def __init__
Definition: z3py.py:6439
void Z3_API Z3_tactic_inc_ref(__in Z3_context c, __in Z3_tactic t)
Increment the reference counter of the given tactic.
def __del__ (   self)

Definition at line 6453 of file z3py.py.

6454  def __del__(self):
6455  if self.tactic != None:
6456  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
def __del__
Definition: z3py.py:6453
void Z3_API Z3_tactic_dec_ref(__in Z3_context c, __in 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 6491 of file z3py.py.

6492  def __call__(self, goal, *arguments, **keywords):
6493  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
6494 
6495  >>> x, y = Ints('x y')
6496  >>> t = Tactic('solve-eqs')
6497  >>> t(And(x == 0, y >= x + 1))
6498  [[y >= 1]]
6499  """
6500  return self.apply(goal, *arguments, **keywords)
def apply
Definition: z3py.py:6474
def __call__
Definition: z3py.py:6491
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 6474 of file z3py.py.

Referenced by Tactic.__call__().

6475  def apply(self, goal, *arguments, **keywords):
6476  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
6477 
6478  >>> x, y = Ints('x y')
6479  >>> t = Tactic('solve-eqs')
6480  >>> t.apply(And(x == 0, y >= x + 1))
6481  [[y >= 1]]
6482  """
6483  if __debug__:
6484  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
6485  goal = _to_goal(goal)
6486  if len(arguments) > 0 or len(keywords) > 0:
6487  p = args2params(arguments, keywords, self.ctx)
6488  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
6489  else:
6490  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
Z3_apply_result Z3_API Z3_tactic_apply(__in Z3_context c, __in Z3_tactic t, __in Z3_goal g)
Apply tactic t to the goal g.
def args2params
Definition: z3py.py:4467
def apply
Definition: z3py.py:6474
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 6501 of file z3py.py.

6502  def help(self):
6503  """Display a string containing a description of the available options for the `self` tactic."""
6504  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
Z3_string Z3_API Z3_tactic_get_help(__in Z3_context c, __in Z3_tactic t)
Return a string containing a description of parameters accepted by the given tactic.
def help
Definition: z3py.py:6501
def param_descrs (   self)
Return the parameter description set.

Definition at line 6505 of file z3py.py.

6506  def param_descrs(self):
6507  """Return the parameter description set."""
6508  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
def param_descrs
Definition: z3py.py:6505
Z3_param_descrs Z3_API Z3_tactic_get_param_descrs(__in Z3_context c, __in Z3_tactic t)
Return the parameter description set for the given tactic object.
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 6457 of file z3py.py.

6458  def solver(self):
6459  """Create a solver using the tactic `self`.
6460 
6461  The solver supports the methods `push()` and `pop()`, but it
6462  will always solve each `check()` from scratch.
6463 
6464  >>> t = Then('simplify', 'nlsat')
6465  >>> s = t.solver()
6466  >>> x = Real('x')
6467  >>> s.add(x**2 == 2, x > 0)
6468  >>> s.check()
6469  sat
6470  >>> s.model()
6471  [x = 1.4142135623?]
6472  """
6473  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx)
def solver
Definition: z3py.py:6457
Z3_solver Z3_API Z3_mk_solver_from_tactic(__in Z3_context c, __in 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 6440 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 6441 of file z3py.py.

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