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

This is the documentation for a snapshot of the develop branch, built from commit 31c6e1f53a.
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Chapter 11. The Conversion Library 1.7

Bjarne Stroustrup

Dave Abrahams

Boris Rasin

Antony Polukhin

Distributed under the Boost Software License, Version 1.0. (See accompanying file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)

Table of Contents

Description
Polymorphic casts
polymorphic_downcast
polymorphic_cast
polymorphic_pointer_cast
Synopsis
History

The Conversion Library improves program safety and clarity by performing otherwise messy conversions. It includes cast-style function templates designed to complement the C++ Standard's built-in casts.

To reduce coupling, particularly to standard library IOStreams, the Boost Conversion Library is supplied by several headers:

  1. The boost/polymorphic_cast.hpp header provides polymorphic_cast<> and polymorphic_downcast<> to perform safe casting between polymorphic types.
  2. The boost/polymorphic_pointer_cast.hpp header provides polymorphic_pointer_cast<> and polymorphic_pointer_downcast<>
  3. The boost/implicit_cast.hpp header provides implicit_cast<> to perform implicit casts only (no down-cast, no void*->T*, no U->T if T has only explicit constructors for U).
  4. The boost/lexical_cast.hpp header provides lexical_cast<> general literal text conversions, such as an int represented as a string, or vice-versa.

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