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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 8413 of file z3py.py.

Constructor & Destructor Documentation

◆ __init__()

__init__ ( self,
tactic,
ctx = None )

Definition at line 8421 of file z3py.py.

8421 def __init__(self, tactic, ctx=None):
8422 self.ctx = _get_ctx(ctx)
8423 self.tactic = None
8424 if isinstance(tactic, TacticObj):
8425 self.tactic = tactic
8426 else:
8427 if z3_debug():
8428 _z3_assert(isinstance(tactic, str), "tactic name expected")
8429 try:
8430 self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
8431 except Z3Exception:
8432 raise Z3Exception("unknown tactic '%s'" % tactic)
8433 Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
8434
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 8438 of file z3py.py.

8438 def __del__(self):
8439 if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
8440 Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
8441
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 8476 of file z3py.py.

8476 def __call__(self, goal, *arguments, **keywords):
8477 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8478
8479 >>> x, y = Ints('x y')
8480 >>> t = Tactic('solve-eqs')
8481 >>> t(And(x == 0, y >= x + 1))
8482 [[y >= 1]]
8483 """
8484 return self.apply(goal, *arguments, **keywords)
8485

◆ __deepcopy__()

__deepcopy__ ( self,
memo = {} )

Definition at line 8435 of file z3py.py.

8435 def __deepcopy__(self, memo={}):
8436 return Tactic(self.tactic, self.ctx)
8437

◆ 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 8459 of file z3py.py.

8459 def apply(self, goal, *arguments, **keywords):
8460 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8461
8462 >>> x, y = Ints('x y')
8463 >>> t = Tactic('solve-eqs')
8464 >>> t.apply(And(x == 0, y >= x + 1))
8465 [[y >= 1]]
8466 """
8467 if z3_debug():
8468 _z3_assert(isinstance(goal, (Goal, BoolRef)), "Z3 Goal or Boolean expressions expected")
8469 goal = _to_goal(goal)
8470 if len(arguments) > 0 or len(keywords) > 0:
8471 p = args2params(arguments, keywords, self.ctx)
8472 return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
8473 else:
8474 return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
8475
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 8486 of file z3py.py.

8486 def help(self):
8487 """Display a string containing a description of the available options for the `self` tactic."""
8488 print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
8489
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 8490 of file z3py.py.

8490 def param_descrs(self):
8491 """Return the parameter description set."""
8492 return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
8493
8494
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 8442 of file z3py.py.

8442 def solver(self, logFile=None):
8443 """Create a solver using the tactic `self`.
8444
8445 The solver supports the methods `push()` and `pop()`, but it
8446 will always solve each `check()` from scratch.
8447
8448 >>> t = Then('simplify', 'nlsat')
8449 >>> s = t.solver()
8450 >>> x = Real('x')
8451 >>> s.add(x**2 == 2, x > 0)
8452 >>> s.check()
8453 sat
8454 >>> s.model()
8455 [x = 1.4142135623?]
8456 """
8457 return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
8458
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 8422 of file z3py.py.

◆ tactic

tactic = None

Definition at line 8423 of file z3py.py.