Boost C++ Libraries

...one of the most highly regarded and expertly designed C++ library projects in the world. Herb Sutter and Andrei Alexandrescu, C++ Coding Standards

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Boost.Python

Extractor Concept

Introduction
Concept Requirements
Extractor Concept
Notes

Introduction

An Extractor is a class which Boost.Python can use to extract C++ objects from Python objects, and is typically used by facilities that define from_python conversions for "traditional" Python extension types.

Concept Requirements

Extractor Concept

In the table below, X denotes a model of Extractor and a denotes an instance of a Python object type.
Expression Type Semantics
X::execute(a) non-void Returns the C++ object being extracted. The execute function must not be overloaded.
&a.ob_type PyTypeObject** Points to the ob_type field of an object which is layout-compatible with PyObject

Notes

Informally, an Extractor's execute member must be a non-overloaded static function whose single argument is a Python object type. Acceptable Python object types include those publicly (and unambiguously) derived from PyObject, and POD types which are layout-compatible with PyObject.

Revised 13 November, 2002

© Copyright Dave Abrahams 2002.

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