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Type: Bug
Resolution: Done
Priority: Not Evaluated
Fix Version/s: None
Affects Version/s: 5.15.2
Component/s: Shiboken
Labels:
None

Platform/s:

Windows
Commits:
e1a2fd9524 (pyside/pyside-setup/dev) e1a2fd9524 (pyside/tqtc-pyside-setup/dev) e1a2fd9524 (pyside/tqtc-pyside-setup/tqtc/dev) e1a2fd9524 (pyside/pyside-setup/6.4), aa0969f57 (tqtc/lts-6.2)

Accessing enums via reference or pointer causes the generated python bindings to either not compile or to silently crash.

Test code

enum TestEnum
{
    ENUM_VALUE_1 = 1,
    ENUM_VALUE_2 = 2,
    ENUM_VALUE_3 = 3
};

struct TestCases
{
    void test_08(TestEnum& e)
    {
        std::cout << "TestEnum& e = " << e << std::endl; 
    }
    
    void test_09(TestEnum* e)
    {
        std::cout << "TestEnum* e = " << *e << std::endl;
    }
};

Case 1: Reference to enum

test_08 does not compile

error C2664: 'void TestCases::test_08(TestEnum &)': cannot convert argument 1 from 'TestEnum *' to 'TestEnum &'

generated code

    // Call function/method
    {
        ::TestEnum *cppArg0;
        pythonToCpp(pyArg, &cppArg0);

            if (!PyErr_Occurred()) {
            // test_08(TestEnum&)
            cppSelf->test_08(cppArg0);  // <--- test_08 accepts a reference
        }
    }

possible solution

Dereferencing the pointer works, but leads to the same crash described in case 2

cppSelf->test_08(*cppArg0);

Case 2: Pointer to enum

test_09 silently crashes in python

Python program exits without any output, probably due to memory corruption on the C++ side

The generated code for test_09

    // Call function/method
    {
        ::TestEnum *cppArg0;
        pythonToCpp(pyArg, &cppArg0);

            if (!PyErr_Occurred()) {
            // test_09(TestEnum*)
            cppSelf->test_09(cppArg0);
        }
    }