在Z3Py中检索枚举类型的值

Question

How do I retrieve the values of an enumerated variable v ? For example,

vTyp, (val1,val2,val3) = EnumSort('vTyp',['val1','val2','val3'])
v = Const('my variable',vTyp)

Now, given just the above variable v , how would I retrieve a list of values [val1,val2,val3] of v (where val1,val3,val3 are expressions as above) ?

I have tried [v.sort().constructor(0), ...(1), ...(2)] but the constructor method does not return an expression.

Answer 1

The expression v.sort().constructor(0) returns a Z3 function declaration. In Z3, constants are functions with 0 arguments. To convert the declaration in a constant expression, we should use v.sort().constructor(0)() .

BTW, the function is_func_decl can be used to test whether an object is a Z3 function declaration or not. The function is_expr is the equivalent for Z3 expressions.

print is_func_decl(v.sort().constructor(0))
print is_expr(v.sort().constructor(0))
print is_expr(v.sort().constructor(0)())