- Boost - lists.preview.boost.org

Introducing the Backbone++ Programming Language
by Phil Bouchard 19 Jul '17

19 Jul '17

Hello Boost, (The former language name is already taken by Microsoft) By taking advantage of the simplicity of the code of Javascript, the power of C++ and the deterministic C++ memory manager Root.Ptr, I decided to write my own programming language which takes advantage of all these powerful features. On the downside Javascript suffers from a slow garbage collector that kicks in randomly which makes it impossible to write real-time engines and C++ just doesn't have any objective memory manager up to this day. My initial attempt was to convert Javascript into C++ but then the principle of 'closures' and 'escape analysis' inlaid with Javascript just makes it impossible to get rid of the garbage collector. So if we sacrifice these principles away then we can integrate Root.Ptr and take advantage of the power of C++ and the true flexibility and run-time features of Javascript. It has to be noted that BB++ is an extension of C++ and therefore everything we can do in C++ can also be done in BB++ and vice-versa. You can find the source code here: https://github.com/philippeb8/root_ptr/tree/bb++/bbpp2cpp And the benchmarks indicate BB++ is 3 times faster than Node.JS! Note that the language is still in a preliminary state but we can already compare it. Furthermore, in theory, it should be possible to offer a service which compiles the executables for combinations of major architecture / OS only once, cache these executables on the webserver and executing them in a specialized container on the client's desktop. This or convert the file BB++ -> C++ -> WebAssembly. Thus, in theory, we would be able to execute real-time engines from within our own browser! So I am including Boost because the backend of BB++ is Root.Ptr and the benefits are inevitable at this point. You can see here an example of mixing BB++ with C++ code and how easy it is for the language to get rid of cyclic references: https://github.com/philippeb8/root_ptr/blob/bb++/bbpp2cpp/tests/input2.bb Regards, -Phil http://www.fornux.com http://www.finitetheory.com https://www.actatabula.com http://www.backbonepp.com

2 2

Free e-book on Packt: Git: Version Control for Everyone by Ravishankar Somasundaram
by degski 19 Jul '17

19 Jul '17

To any-one interested. As per the title <https://www.packtpub.com/application-development/git-version-control-everyo…> (Registration (free) required). Have a *good* day, degski -- "*Ihre sogenannte Religion wirkt bloß wie ein Opiat reizend, betäubend, Schmerzen aus Schwäche stillend.*" - Novalis 1798

1 0

[math] Efficient polynomial multiplication
by Lakshay Garg 18 Jul '17

18 Jul '17

Hello all This is my first post to the mailing list. While looking at the source code for polynomial multiplication (boost/math/tools/polynomial.hpp) I discovered that the library used O(N^2) algorithm for multiplication. I would like to work on implementing a more efficient algorithm (complexity: O(N log(N))). I am writing this mail to get views and feedback from the community and have a healthy discussion before starting the work. Lakshay

5 8

Introducing the X++ Programming Language
by Phil Bouchard 18 Jul '17

18 Jul '17

Hello Boost / Qt, By taking advantage of the simplicity of the code of Javascript, the power of C++ and the deterministic C++ memory manager Root.Ptr, I decided to write my own programming language which takes advantage of all these powerful features. On the downside Javascript suffers from a slow garbage collector that kicks in randomly which makes it impossible to write real-time engines and C++ just doesn't have any objective memory manager up to this day. My initial attempt was to convert Javascript into C++ but then the principle of 'closures' and 'escape analysis' inlaid with Javascript just makes it impossible to get rid of the garbage collector. So if we sacrifice these principles away then we can integrate Root.Ptr and take advantage of the power of C++ and the true flexibility and run-time features of Javascript. It has to be noted that X++ is an extension of C++ and therefore everything we can do in C++ can also be done in X++. You can find the source code here: https://github.com/philippeb8/root_ptr/tree/x++/xpp2cpp And the benchmarks indicate X++ is 2.7 faster than Node.JS! Note that the language is still in a preliminary state but we can already compare it. Furthermore, in theory, is should be possible to offer a service which compiles the executables for combinations of major architecture / OS only once, cache these executables on the webserver and executing them in a specialized container on the client's desktop. Thus, in theory, we would be able to execute real-time engines from within our own browser! So I am including Boost because one day X++ could be merged with the C++ programming language and I know Boost is well used in the vast gaming industry which requires real-time engines. Regards, -Phil http://www.fornux.com http://www.finitetheory.com https://www.actatabula.com https://github.com/philippeb8/root_ptr/tree/x++/xpp2cpp

3 7

Error handling libraries and proposals
by Emil Dotchevski 17 Jul '17

17 Jul '17

Last week it was brought to my attention that there are currently 5 different libraries and proposals for dealing with the problem of reporting errors from noexcept functions, so I thought it would be useful to update the Noexcept documentation with a short section comparing all the different designs: https://zajo.github.io/boost-noexcept/#alternatives.

6 43

Re: [boost] Outcome v2
by Groke, Paul 17 Jul '17

17 Jul '17

> From: Emil DotchevskiSent: Freitag, 14. Juli 2017 18:37 > To: boost(a)lists.boost.org > > Ah, now I get it, thanks for the explanation. There *might* even be a > way to get this to work even without memory allocation in the end > (without exception_ptr), but I think this is perhaps missing the point > of returning an error object, which is to be able to interact with it. > Also, reasonably if you could fit the things you need to create the > object into a "small object optimized" buffer, you can probably fit the > object itself into the same buffer. Noexcept already has that, it's the > result<T> object, however it might be too heavy to return up the call > chain one level at a time (it is instead designed for capturing the TLS- > stored object to postpone its handling, perhaps after moving it to > another thread). The question is: how do you interact with a return value of unknown type? For exceptions it's much easier. There is at least the common practice to derive your exception from std::exception, so if nothing else, you can at least get an error message. And you can catch base classes, which can also come in quite handy.

3 2

Boost libraries and Travis CI
by Edward Diener 16 Jul '17

16 Jul '17

Evidently to turn on Travis CI testing for a Boost library in Github you need to be the Administrator for that library, and not just a team member for that library. Is an Admin request the way to get Travis CI testing turned on for a library ? If not what is the proper way to turn on Travis CI testing for a Boost library once the .travis.yml file is added to the library ?

2 1

Regression tests on 'develop'
by Edward Diener 16 Jul '17

16 Jul '17

A number of regression tests on 'develop' have not been run for a long time. These includes Linux tests by 'Sandia' and 'teeks'. Does anyone know why these regression tests have not run for quite a while ?

1 0

Preprocessor directive for a sequence that differs only in datatype
by Rishabh Arora 16 Jul '17

16 Jul '17

Hello Everyone, I was trying to use the boost.preprocessor to write some code which otherwise needs to be written for all the cases. Here's the code: https://github.com/BoostGSoC17/dataframe/blob/master/include/df.cpp (line no. 430 and 431). But on compilation it gives the error: error: macro "BOOST_PP_SEQ_ELEM_III" requires 2 arguments, but only 1 given print_column <BOOST_PP_SEQ_ELEM(type, INNER_TYPE) >(i); I didn't understand the reason as when I wrote: print_column <BOOST_PP_SEQ_ELEM(any_numerical_value(0, 1, ...), INNER_TYPE) >(i); it works fine. Can anyone help me understand the error or provide an alternative way to do the same thing? Thanks in advance, Best Regards, Rishabh

3 6

[stacktrace][1.65 beta1] Problem with reference docs
by Joaquin M López Muñoz 16 Jul '17

16 Jul '17

The following http://www.boost.org/doc/libs/1_65_0_beta1/doc/html/reference.html displays BoostBook-related garbage rather than the real reference for the lib, unlike http://boostorg.github.io/stacktrace/reference.html Best, Joaquín M López Muñoz

4 5