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Add attribute to Dummy: dummy_index #517

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Add attribute to Dummy: dummy_index #517

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49c0638
Add attribute to Dummy: dummy_index
bjodah Jul 11, 2025
0d3c056
Merge branch 'master' into dummy_index
bjodah Jul 14, 2025
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3 changes: 2 additions & 1 deletion symengine/lib/symengine.pxd
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Original file line number Diff line number Diff line change
Expand Up @@ -133,6 +133,7 @@ cdef extern from "<symengine/basic.h>" namespace "SymEngine":
RCP[const Rational] rcp_static_cast_Rational "SymEngine::rcp_static_cast<const SymEngine::Rational>"(rcp_const_basic &b) nogil
RCP[const Complex] rcp_static_cast_Complex "SymEngine::rcp_static_cast<const SymEngine::Complex>"(rcp_const_basic &b) nogil
RCP[const Number] rcp_static_cast_Number "SymEngine::rcp_static_cast<const SymEngine::Number>"(rcp_const_basic &b) nogil
RCP[const Dummy] rcp_static_cast_Dummy "SymEngine::rcp_static_cast<const SymEngine::Dummy>"(rcp_const_basic &b) nogil
RCP[const Add] rcp_static_cast_Add "SymEngine::rcp_static_cast<const SymEngine::Add>"(rcp_const_basic &b) nogil
RCP[const Mul] rcp_static_cast_Mul "SymEngine::rcp_static_cast<const SymEngine::Mul>"(rcp_const_basic &b) nogil
RCP[const Pow] rcp_static_cast_Pow "SymEngine::rcp_static_cast<const SymEngine::Pow>"(rcp_const_basic &b) nogil
Expand Down Expand Up @@ -180,7 +181,7 @@ cdef extern from "<symengine/symbol.h>" namespace "SymEngine":
Symbol(string name) nogil
string get_name() nogil
cdef cppclass Dummy(Symbol):
pass
size_t get_index()

cdef extern from "<symengine/number.h>" namespace "SymEngine":
cdef cppclass Number(Basic):
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6 changes: 6 additions & 0 deletions symengine/lib/symengine_wrapper.in.pyx
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Expand Up @@ -1355,6 +1355,12 @@ cdef class Dummy(Symbol):
def func(self):
return self.__class__

@property
def dummy_index(self):
cdef RCP[const symengine.Dummy] this = \
symengine.rcp_static_cast_Dummy(self.thisptr)
cdef size_t index = deref(this).get_index()
return index

def symarray(prefix, shape, **kwargs):
""" Creates an nd-array of symbols
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1 change: 1 addition & 0 deletions symengine/tests/test_symbol.py
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Expand Up @@ -156,6 +156,7 @@ def test_dummy():
x2 = Symbol('x')
xdummy1 = Dummy('x')
xdummy2 = Dummy('x')
assert xdummy1.dummy_index != xdummy2.dummy_index # maybe test using "less than"?

assert x1 == x2
assert x1 != xdummy1
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