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- <a name="the_type_traits_introspection_library.tti_reason"></a><a class="link" href="tti_reason.html" title="Why the TTI Library ?">Why the
- TTI Library ?</a>
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- <p>
- In the Boost Type Traits library there is compile time functionality for querying
- information about a C++ type. This information is very useful during template
- metaprogramming and forms the basis, along with the constructs of the Boost
- MPL library, and some other compile time libraries, for much of the template
- metaprogramming in Boost.
- </p>
- <p>
- One area which is mostly missing in the Type Traits library is the ability
- to determine what C++ inner elements are part of a type, where the inner element
- may be a nested type, function or data member, static function or static data
- member, or class template.
- </p>
- <p>
- There has been some of this functionality in Boost, both in already existing
- libraries and in libraries on which others have worked but which were never
- submitted for acceptance into Boost. An example with an existing Boost library
- is Boost MPL, where there is functionality, in the form of macros and metafunctions,
- to determine whether an enclosing type has a particular nested type or nested
- class template. An example with a library which was never submitted to Boost
- is the Concept Traits Library from which much of the functionality of this
- library, related to type traits, was taken and expanded.
- </p>
- <p>
- It may also be possible that some other Boost libraries, highly dependent on
- advanced template metaprogramming techniques, also have internal functionality
- to introspect a type's elements at compile time. But to the best of my knowledge
- this sort of functionality has never been incorporated in a single Boost library.
- This library is an attempt to do so, and to bring a recognizable set of interfaces
- to compile-time type introspection to Boost so that other metaprogramming libraries
- can use them for their own needs.
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- <td align="right"><div class="copyright-footer">Copyright © 2011-2013 Tropic Software
- East Inc<p>
- Distributed under the Boost Software License, Version 1.0. (See accompanying
- file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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