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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 8409 of file z3py.py.

Constructor & Destructor Documentation

◆ __init__()

__init__ ( self,
tactic,
ctx = None )

Definition at line 8417 of file z3py.py.

8417 def __init__(self, tactic, ctx=None):
8418 self.ctx = _get_ctx(ctx)
8419 self.tactic = None
8420 if isinstance(tactic, TacticObj):
8421 self.tactic = tactic
8422 else:
8423 if z3_debug():
8424 _z3_assert(isinstance(tactic, str), "tactic name expected")
8425 try:
8426 self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
8427 except Z3Exception:
8428 raise Z3Exception("unknown tactic '%s'" % tactic)
8429 Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)
8430
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 8434 of file z3py.py.

8434 def __del__(self):
8435 if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
8436 Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)
8437
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 8472 of file z3py.py.

8472 def __call__(self, goal, *arguments, **keywords):
8473 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8474
8475 >>> x, y = Ints('x y')
8476 >>> t = Tactic('solve-eqs')
8477 >>> t(And(x == 0, y >= x + 1))
8478 [[y >= 1]]
8479 """
8480 return self.apply(goal, *arguments, **keywords)
8481

◆ __deepcopy__()

__deepcopy__ ( self,
memo = {} )

Definition at line 8431 of file z3py.py.

8431 def __deepcopy__(self, memo={}):
8432 return Tactic(self.tactic, self.ctx)
8433

◆ 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 8455 of file z3py.py.

8455 def apply(self, goal, *arguments, **keywords):
8456 """Apply tactic `self` to the given goal or Z3 Boolean expression using the given options.
8457
8458 >>> x, y = Ints('x y')
8459 >>> t = Tactic('solve-eqs')
8460 >>> t.apply(And(x == 0, y >= x + 1))
8461 [[y >= 1]]
8462 """
8463 if z3_debug():
8464 _z3_assert(isinstance(goal, (Goal, BoolRef)), "Z3 Goal or Boolean expressions expected")
8465 goal = _to_goal(goal)
8466 if len(arguments) > 0 or len(keywords) > 0:
8467 p = args2params(arguments, keywords, self.ctx)
8468 return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
8469 else:
8470 return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)
8471
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 8482 of file z3py.py.

8482 def help(self):
8483 """Display a string containing a description of the available options for the `self` tactic."""
8484 print(Z3_tactic_get_help(self.ctx.ref(), self.tactic))
8485
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 8486 of file z3py.py.

8486 def param_descrs(self):
8487 """Return the parameter description set."""
8488 return ParamDescrsRef(Z3_tactic_get_param_descrs(self.ctx.ref(), self.tactic), self.ctx)
8489
8490
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 8438 of file z3py.py.

8438 def solver(self, logFile=None):
8439 """Create a solver using the tactic `self`.
8440
8441 The solver supports the methods `push()` and `pop()`, but it
8442 will always solve each `check()` from scratch.
8443
8444 >>> t = Then('simplify', 'nlsat')
8445 >>> s = t.solver()
8446 >>> x = Real('x')
8447 >>> s.add(x**2 == 2, x > 0)
8448 >>> s.check()
8449 sat
8450 >>> s.model()
8451 [x = 1.4142135623?]
8452 """
8453 return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx, logFile)
8454
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 8418 of file z3py.py.

◆ tactic

tactic = None

Definition at line 8419 of file z3py.py.