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 8477 of file z3py.py.

Constructor & Destructor Documentation

__init__()

__init__	(		self,
			tactic,
			ctx = None )

Definition at line 8485 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 z3_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__()

__del__

(

self

)

Definition at line 8502 of file z3py.py.

    def __del__(self):
        if self.tactic is not None and self.ctx.ref() is not None and Z3_tactic_dec_ref is not None:
            Z3_tactic_dec_ref(self.ctx.ref(), self.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 8540 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)
 

__deepcopy__()

__deepcopy__	(		self,
			memo = {} )

Definition at line 8499 of file z3py.py.

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

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 8523 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 z3_debug():
            _z3_assert(isinstance(goal, (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)
 

help()

help

(

self

)

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

Definition at line 8550 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()

param_descrs

(

self

)

Return the parameter description set.

Definition at line 8554 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()

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 8506 of file z3py.py.

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

Field Documentation

ctx

ctx = _get_ctx(ctx)

Definition at line 8486 of file z3py.py.

tactic

tactic = None

Definition at line 8487 of file z3py.py.