Jun 12

Here’s another cool Spirit talk. This time from Bryce Alexander Lelbach:

http://blip.tv/boostcon/ast-construction-with-the-universal-tree-5266608

utree, a recent addition to the Boost.Spirit codebase, is a generic data structure designed to represent abstract syntax trees. Bindings to Qi and Karma make utree a powerful tool for parser and generator development with Boost.Spirit. This presentation would demonstrate the usage of utree and Spirit to build and manipulate an abstract syntax tree for four parsing/generating use cases: XML, symbolic expressions, JSON, and C-like source code. The details of utree’s integration with Spirit and their implications for writing utree-centric Spirit parsers and generators would be discussed. Additionally, design patterns for compiling a utree AST to other internal representations (DOM tree for XML, function tree for a Scheme-like language for symbolic expressions, associative arrays for JSON objects, a simple VM bytecode for mini-C source code) would be covered.

Here are the slides:

https://github.com/boostcon/2011_presentations/raw/master/fri/utree_talk.pdf

 

Jun 08

Here’s another BoostCon video uploaded by Marshall Clow. This one is about Phoenix V3, by Hartmut Kaiser:

http://blip.tv/boostcon/phoenix-v3-an-overview-5250984

The slides for this talk can be found here: https://github.com/boostcon/2011_presentations/blob/master/mon/phoenix_v3.pdf?raw=true.

Phoenix will be the next generation of creating unnamed, inlined polymorphic function objects. With V3 we combine the functionality of Boost.Bind and Boost.Lambda, and arranges it into a new library. By writing this new library, we were able to fix some limitations of the aforementioned libraries without breaking backwardscompatibility. The purpose of the talk will be to outline the importance and elegance of functional programming (FP) in C++. The first part of the talk will give an introduction into the Domain Specific Embedded Language (DSEL) we defined with Phoenix. A DSEL is built with the help of regular C++ function and operator overloads. For Phoenix we defined such a language that emulates C++, to give potential users a low entry into the world of FP. While a lot of existing C++ code relies on higher order functions (better known as function objects), e.g. the C++ standard library use them as a way to let users customize operations in certain algorithms. We focus the second part of the talk on examples on how to use Phoenix instead of writing regular function objects and how to enable your legacy code to be used inside Phoenix expressions. However, Phoenix is more. Phoenix is equipped with a unique (in C++) mechanism to handle the expressions discussed in the previous sections as data. This allows us to handle Phoenix not in the C++ standard way but in any way you like. An overview of these mechanisms will be given in the last part of the talk to give potential users an insight on possible future applications that might evolve around Phoenix.

Jun 08

This is the first time I missed attending BoostCon (May 15-20, 2011 – Aspen, Colorado). Fortunately, for us who were not able to attend, Marshall Clow uploaded some videos. Here’s one one that’s relevant to Spirit: “Spirit.Qi in the Real World”, by Robert Stewart. Watch the presentation here:

http://blip.tv/boostcon/spirit-qi-in-the-real-world-5254335

You can find the slides here: https://github.com/boostcon/2011_presentations/raw/master/tue/spirit_qi_in_the_real_world.pdf

Past sessions on Spirit have focused on introducing Spirit or showing extracts of real use, intermingled with tutorial highlights. Upon writing real Spirit.Qi parsers, however, one quickly discovers that “the devil is in the details.” There are special cases, tricks, and idioms that one must discover by trial and error or, perhaps, by following the Spirit mailing list, all of which take time and may not be convenient. In this session, we’ll walk through the development of a Spirit.Qi parser for printf()-style format strings. The result will be a replacement for printf() that is typesafe and efficient.

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Feb 05

Promising to be the main face-to-face event for all things Boost, BoostCon 2010 opens the door to your C++ future. From using the Boost libraries to writing and maintaining them, from evangelizing to deploying Boost within your organization, from infrastructure and process to vision and mission, and from TR1 to TR2, BoostCon brings together the sessions, the colleagues, and the inspiration to support your work with Boost for the next year.

To reflect the breadth of the Boost community, the conference includes sessions aimed at two constituencies: Boost end-users and hard-core Boost library and tool developers. The program fosters interaction and engagement within and across those two groups, with an emphasis on hands-on, participatory sessions.

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