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expose bounds as vector expressions instead of containing ad-hoc expressions. Issue #911

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Signed-off-by: Nikolaj Bjorner <nbjorner@microsoft.com>
This commit is contained in:
Nikolaj Bjorner 2017-02-24 11:07:40 -08:00
parent e744d0f271
commit e02160c674
11 changed files with 158 additions and 4 deletions
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22
src/api/python/z3/z3.py
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@ -6719,12 +6719,24 @@ class OptimizeObjective:
opt = self._opt
return _to_expr_ref(Z3_optimize_get_upper(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def lower_values(self):
opt = self._opt
return AstVector(Z3_optimize_get_lower_as_vector(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def upper_values(self):
opt = self._opt
return AstVector(Z3_optimize_get_upper_as_vector(opt.ctx.ref(), opt.optimize, self._value), opt.ctx)
def value(self):
if self._is_max:
return self.upper()
else:
return self.lower()
def __str__(self):
return "%s:%s" % (self._value, self._is_max)
class Optimize(Z3PPObject):
"""Optimize API provides methods for solving using objective functions and weighted soft constraints"""
@ -6829,6 +6841,16 @@ class Optimize(Z3PPObject):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.upper()
def lower_values(self, obj):
if not isinstance(obj, OptimizeObjective):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.lower_values()
def upper_values(self, obj):
if not isinstance(obj, OptimizeObjective):
raise Z3Exception("Expecting objective handle returned by maximize/minimize")
return obj.upper_values()
def from_file(self, filename):
"""Parse assertions and objectives from a file"""
Z3_optimize_from_file(self.ctx.ref(), self.optimize, filename)