Tactic Class Reference

Public Member Functions
def	__init__ (self, tactic, ctx=None)
def	__del__ (self)
def	solver (self)
def	apply (self, goal, *arguments, **keywords)
def	__call__ (self, goal, *arguments, **keywords)
def	help (self)
def	param_descrs (self)

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 6946 of file z3py.py.

Constructor & Destructor Documentation

__init__()

def __init__	(		self,
			tactic,
			ctx = None
	)

Definition at line 6951 of file z3py.py.

    def __init__(self, tactic, ctx=None):
        self.ctx    = _get_ctx(ctx)
        self.tactic = None
        if isinstance(tactic, TacticObj):
            self.tactic = tactic
        else:
            if __debug__:
                _z3_assert(isinstance(tactic, str), "tactic name expected")
            try:
                self.tactic = Z3_mk_tactic(self.ctx.ref(), str(tactic))
            except Z3Exception:
                raise Z3Exception("unknown tactic '%s'" % tactic)
        Z3_tactic_inc_ref(self.ctx.ref(), self.tactic)

__del__()

def __del__

(

self

)

Definition at line 6965 of file z3py.py.

    def __del__(self):
        if self.tactic is not None and self.ctx.ref() is not None:
            Z3_tactic_dec_ref(self.ctx.ref(), self.tactic)

Member Function Documentation

__call__()

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 7003 of file z3py.py.

    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]]
        """
        return self.apply(goal, *arguments, **keywords)

apply()

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 6986 of file z3py.py.

    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]]
        """
        if __debug__:
            _z3_assert(isinstance(goal, Goal) or isinstance(goal, BoolRef), "Z3 Goal or Boolean expressions expected")
        goal = _to_goal(goal)
        if len(arguments) > 0 or len(keywords) > 0:
            p = args2params(arguments, keywords, self.ctx)
            return ApplyResult(Z3_tactic_apply_ex(self.ctx.ref(), self.tactic, goal.goal, p.params), self.ctx)
        else:
            return ApplyResult(Z3_tactic_apply(self.ctx.ref(), self.tactic, goal.goal), self.ctx)

Referenced by Tactic.__call__().

help()

def help

(

self

)

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

Definition at line 7013 of file z3py.py.

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

param_descrs()

def param_descrs

(

self

)

Return the parameter description set.

Definition at line 7017 of file z3py.py.

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

solver()

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 6969 of file z3py.py.

    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?]
        """
        return Solver(Z3_mk_solver_from_tactic(self.ctx.ref(), self.tactic), self.ctx)

Field Documentation

ctx

ctx

Definition at line 6952 of file z3py.py.

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

tactic

tactic

Definition at line 6953 of file z3py.py.

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