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.. _codegenerationterminology:
***************************
Code Generation Terminology
***************************
Types of generated code
=======================
**Python Wrapper**
The code that exports the C++ wrapped class to Python. **Python wrapper**
refers to all the code needed to export a C++ class to Python, and
**Python method/function wrapper** means the specific function that calls
the C++ method/function on behalf of Python. This code is invoked from
the Python side.
**C++ Wrapper**
This term refers to a generated C++ class that extends a class from the
wrapped library. It is generated only when a wrapped C++ class is
polymorphic, i.e. it has or inherits any virtual methods.
The **C++ Wrapper** overrides the virtual methods of the wrapped C++ class
with code that allows for overriding the method with a Python implementation.
It checks whether a corresponding method in the Python instance exists and
calls it. This code is invoked from the C++ side.
Specifying a target for modifications
=====================================
In the typesystem files, the ``class`` attribute is used to which class a
modification is applied (see :ref:`codeinjectionsemantics`,
:ref:`objectownership`).
The value **Target** means the modification is applied to the
**Python Wrapper**. The value **Native** means the modification is applied to
the **C++ Wrapper**.
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