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Public Member Functions | Data Fields
Tactic Class Reference

Public Member Functions

def __init__
 
def __deepcopy__
 
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 7608 of file z3py.py.

Constructor & Destructor Documentation

def __init__ (   self,
  tactic,
  ctx = None 
)

Definition at line 7613 of file z3py.py.

7614  def __init__(self, tactic, ctx=None):
7615  self.ctx = _get_ctx(ctx)
7616  self.tactic = None
7617  if isinstance(tactic, TacticObj):
7618  self.tactic = tactic
7619  else:
7620  if z3_debug():
7621  _z3_assert(isinstance(tactic, str), "tactic name expected")
7622  try:
7623  self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
7624  except Z3Exception:
7625  raise Z3Exception("unknown tactic '%s'" % tactic)
7626  Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given 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...
def __init__
Definition: z3py.py:7613
def z3_debug
Definition: z3py.py:58
def __del__ (   self)

Definition at line 7630 of file z3py.py.

7631  def __del__(self):
7632  if self.tactic is not None and self.ctx.ref() is not None:
7633  Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
def __del__
Definition: z3py.py:7630
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 7668 of file z3py.py.

7669  def __call__(self, goal, *arguments, **keywords):
7670  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7671 
7672  >>> x, y = Ints('x y')
7673  >>> t = Tactic('solve-eqs')
7674  >>> t(And(x == 0, y >= x + 1))
7675  [[y >= 1]]
7676  """
7677  return self.apply(goal, *arguments, **keywords)
def apply
Definition: z3py.py:7651
def __call__
Definition: z3py.py:7668
def __deepcopy__ (   self,
  memo = {} 
)

Definition at line 7627 of file z3py.py.

7628  def __deepcopy__(self, memo={}):
7629  return Tactic(self.tactic, self.ctx)
def __deepcopy__
Definition: z3py.py:7627
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 7651 of file z3py.py.

Referenced by Tactic.__call__().

7652  def apply(self, goal, *arguments, **keywords):
7653  """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
7654 
7655  >>> x, y = Ints('x y')
7656  >>> t = Tactic('solve-eqs')
7657  >>> t.apply(And(x == 0, y >= x + 1))
7658  [[y >= 1]]
7659  """
7660  if z3_debug():
7661  _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
7662  goal = _to_goal(goal)
7663  if len(arguments) > 0 or len(keywords) > 0:
7664  p = args2params(arguments, keywords, self.ctx)
7665  return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
7666  else:
7667  return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.
def args2params
Definition: z3py.py:5050
def apply
Definition: z3py.py:7651
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 z3_debug
Definition: z3py.py:58
def help (   self)
Display a string containing a description of the available options for the `self` tactic.

Definition at line 7678 of file z3py.py.

7679  def help(self):
7680  """Display a string containing a description of the available options for the `self` tactic."""
7681  print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
def help
Definition: z3py.py:7678
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 7682 of file z3py.py.

7683  def param_descrs(self):
7684  """Return the parameter description set."""
7685  return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
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.
def param_descrs
Definition: z3py.py:7682
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 7634 of file z3py.py.

7635  def solver(self):
7636  """Create a solver using the tactic `self`.
7637 
7638  The solver supports the methods `push()` and `pop()`, but it
7639  will always solve each `check()` from scratch.
7640 
7641  >>> t = Then('simplify', 'nlsat')
7642  >>> s = t.solver()
7643  >>> x = Real('x')
7644  >>> s.add(x**2 == 2, x > 0)
7645  >>> s.check()
7646  sat
7647  >>> s.model()
7648  [x = 1.4142135623?]
7649  """
7650  return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx)
def solver
Definition: z3py.py:7634
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 7614 of file z3py.py.

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

tactic

Definition at line 7615 of file z3py.py.

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