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# Potential Incompatibilities with Earlier Versions

This section describes incompatibilities introduced by particular versions of SIP. Normally these are the removal of previously deprecated features.

## SIP v4.8

### __truediv__

Prior to this version the `__div__()` special method implicitly defined the `__truediv__()` special method. From this version the `__truediv__()` special method must be explicitly defined.

### sipWrapper user Member

Prior to this version the `sipWrapper` structure had a member called `user` which is available for handwritten code to use. From this version `user` is a member of the `sipSimpleWrapper` structure.

`sipWrapper` pointers can be safely cast to `sipSimpleWrapper` pointers, so if your code does something like:

    ((sipWrapper *)obj)->user = an_object_reference;

then you just need to change it to:

    ((sipSimpleWrapper *)obj)->user = an_object_reference;

### Removal of Previously Deprecated Features

The following parts of the C API have been removed.

- The `a`, `A`, `M`, `N`, `O`, `P` and `T` format characters from `sipBuildResult()` and `sipCallMethod()`.
- The `a`, `A`, `L` and `M` format characters from `sipParseResult()`.
- `sipConvertToCpp()`
- `sipIsSubClassInstance()`
- `sipTransfer()`
- The `transfer()` function of the `sip` module.
- The old-style generated type convertors.

In addition the -a command line option to `configure.py` has been removed.

### Removal of PyQt-specific Features

The following PyQt-specific support functions have been removed.

- `sipConnectRx()`
- `sipDisconnectRx()`
- `sipEmitSlot()`
- `sipGetSender()`

### Newly Deprecated Features

The following parts of the C API are now deprecated (but still supported).

- The Generated Type Objects.
- The Generated Named Enum Type Objects.
- `sipConvertFromInstance()`
- `sipConvertFromMappedType()`
- `sipConvertFromNamedEnum()`
- `sipConvertFromNewInstance()`
- `sipCanConvertToInstance()`
- `sipCanConvertToMappedType()`
- `sipConvertToInstance()`
- `sipConvertToMappedType()`
- `sipForceConvertToInstance()`
- `sipForceConvertToMappedType()`
- `sipClassName()`
- `sipFindClass()`
- `sipFindNamedEnum()`
- `sipFindMappedType()`
- `sipGetWrapper()`
- `sipReleaseInstance()`
- `sipReleaseMappedType()`
- `sipWrapper_Check()`
- The `B`, `C` and `E` format characters of `sipBuildResult()` and `sipCallMethod()`.
- The `s`, `C` and `E` format character of `sipParseResult()`.

## SIP v4.7.8

### Automatic int to Enum Conversions

This version allows a Python `int` object to be passed whenever an enum is expected. This can mean that two signatures that were different with prior versions are now the same as far as Python is concerned.

The `Constrained` argument annotation can now be applied to an enum argument to revert to the earlier behaviour.

## SIP v4.7.3

### Complementary Comparison Operators

Prior to this version SIP did not automatically generate missing complementary comparison operators. Typically this was worked around by adding them explicitly to the .sip files, even though they weren’t implemented in C++ and relied on the C++ compiler calling the complementary operator that was implemented.

A necessary change to the code generator meant that this not longer worked and so SIP was changed to automatically generate any missing complementary operators. If you have added such operators explicitly then you should remove them or make them dependent on the particular version of SIP.

## SIP v4.4

### %ConvertFromTypeCode and %ConvertToTypeCode

Handwritten `%ConvertFromTypeCode` and `%ConvertToTypeCode` now have the responsibility for implementing the `Transfer` and `TransferBack` annotations.

### SIP_BUILD

The `SIP_BUILD` C preprocessor symbol has been removed.

### Newly Deprecated Features

The following parts of the C API are now deprecated (but still supported).

- The old-style generated type convertors.
- `sipConvertToCpp()`
- `sipIsSubClassInstance()`

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