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Tactic Class Reference

Public Member Functions

 __init__ (self, tactic, ctx=None)
 __deepcopy__ (self, memo={})
 __del__ (self)
 solver (self, logFile=None)
 apply (self, goal, *arguments, **keywords)
 __call__ (self, goal, *arguments, **keywords)
 help (self)
 param_descrs (self)

Data Fields

 ctx = _get_ctx(ctx)
 tactic = None

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 8418 of file z3py.py.

Constructor & Destructor Documentation

◆ __init__()

__init__ ( self,
tactic,
ctx = None )

Definition at line 8426 of file z3py.py.

8426 def __init__(self, tactic, ctx=None):
8427 self.ctx = _get_ctx(ctx)
8428 self.tactic = None
8429 if isinstance(tactic, TacticObj):
8430 self.tactic = tactic
8431 else:
8432 if z3_debug():
8433 _z3_assert(isinstance(tactic, str), "tactic name expected")
8434 try:
8435 self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
8436 except Z3Exception:
8437 raise Z3Exception("unknown tactic '%s'" % tactic)
8438 Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
8439
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...
void Z3_API Z3_tactic_inc_ref(Z3_context c, Z3_tactic t)
Increment the reference counter of the given tactic.

◆ __del__()

__del__ ( self)

Definition at line 8443 of file z3py.py.

8443 def __del__(self):
8444 if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
8445 Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
8446
void Z3_API Z3_tactic_dec_ref(Z3_context c, Z3_tactic g)
Decrement the reference counter of the given tactic.

Member Function Documentation

◆ __call__()

__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 8481 of file z3py.py.

8481 def __call__(self, goal, *arguments, **keywords):
8482 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8483
8484 >>> x, y = Ints('x y')
8485 >>> t = Tactic('solve-eqs')
8486 >>> t(And(x == 0, y >= x + 1))
8487 [[y >= 1]]
8488 """
8489 return self.apply(goal, *arguments, **keywords)
8490

◆ __deepcopy__()

__deepcopy__ ( self,
memo = {} )

Definition at line 8440 of file z3py.py.

8440 def __deepcopy__(self, memo={}):
8441 return Tactic(self.tactic, self.ctx)
8442

◆ apply()

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 8464 of file z3py.py.

8464 def apply(self, goal, *arguments, **keywords):
8465 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8466
8467 >>> x, y = Ints('x y')
8468 >>> t = Tactic('solve-eqs')
8469 >>> t.apply(And(x == 0, y >= x + 1))
8470 [[y >= 1]]
8471 """
8472 if z3_debug():
8473 _z3_assert(isinstance(goal, (Goal, BoolRef)), "Z3 Goal or Boolean expressions expected")
8474 goal = _to_goal(goal)
8475 if len(arguments) > 0 or len(keywords) > 0:
8476 p = args2params(arguments, keywords, self.ctx)
8477 return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
8478 else:
8479 return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
8480
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.
Z3_apply_result Z3_API Z3_tactic_apply(Z3_context c, Z3_tactic t, Z3_goal g)
Apply tactic t to the goal g.

◆ help()

help ( self)
Display a string containing a description of the available options for the `self` tactic.

Definition at line 8491 of file z3py.py.

8491 def help(self):
8492 """Display a string containing a description of the available options for the `self` tactic."""
8493 print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
8494
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.

◆ param_descrs()

param_descrs ( self)
Return the parameter description set.

Definition at line 8495 of file z3py.py.

8495 def param_descrs(self):
8496 """Return the parameter description set."""
8497 return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
8498
8499
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.

◆ solver()

solver ( self,
logFile = None )
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 8447 of file z3py.py.

8447 def solver(self, logFile=None):
8448 """Create a solver using the tactic `self`.
8449
8450 The solver supports the methods `push()` and `pop()`, but it
8451 will always solve each `check()` from scratch.
8452
8453 >>> t = Then('simplify', 'nlsat')
8454 >>> s = t.solver()
8455 >>> x = Real('x')
8456 >>> s.add(x**2 == 2, x > 0)
8457 >>> s.check()
8458 sat
8459 >>> s.model()
8460 [x = 1.4142135623?]
8461 """
8462 return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
8463
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

ctx = _get_ctx(ctx)

Definition at line 8427 of file z3py.py.

◆ tactic

tactic = None

Definition at line 8428 of file z3py.py.