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boost range dynamic joined_range
by Lars Sunde 06 Apr '20

06 Apr '20

Hello, How can I create a Boost Range for multiple vectors without setting any limitation to the number of vector at compile time? Using Boost 1.70 and it is not an option to store all data in one vector. The following code compile on Visual Studio 2017 and will output the number 1 to 9. However, this code is compiled to support 3 vectors inside the foo struct. In order to support 4 vectors I would need to re-compile the code. The number of vectors is only known at runtime. How can this code be improved to support a dynamic number of vectors ? #include <iostream> #include <vector> #include <boost/range.hpp> #include <boost/range/join.hpp> struct foo { typedef boost::range::joined_range< boost::range::joined_range< std::vector<int>, std::vector<int>>, std::vector<int>> range; std::vector<std::vector<int>> vec; foo() { vec = { {1,2,3}, {4,5,6}, {7,8,9} }; } range my_range() { auto range1 = boost::join(vec[0], vec[1]); return boost::join(range1, vec[2]); } }; int main() { foo f1; for (auto item : f1.my_range()) std::cout << item << " "; return 0; } Appreciate any input. Kind regards, Lars

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[type-erasure?] callable configurable type-erasure
by Igor R 05 Apr '20

05 Apr '20

Hi, In my project I need a callable type-erasure - just like std::function/boost::function, but with a *configurable* small-object optimization (I will use it in a context where dynamic allocation is highly discouraged, so I'm going to make relatively big "static" holder). Is it possible to use TypeErasure library this way? Or maybe we have some other facilities in Boost that could be useful for this purpose? Thanks.

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asio and custom socket implementation
by Stanislav Zaikin 03 Apr '20

03 Apr '20

Hello! I have a custom network stack (it processed packets in userspace) which exposed some functions in C. It has its own listen, bind, accept functions and many other, and furthermore even custom epoll, select and poll. I want to expand asio in some away, just to support my application with this custom network stack. But I'm a bit confused how I can do it. Should I write my own basic io class? Or should I write custom socket service class like (reactive_socket_service_base)? And is it possible to use basic tcp classes (with any of them)? If there are any examples in open source please let me know. -- Best regards Stanislav Zaikin

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Boost download links seems to be down
by andrews＠brutsoft.com 28 Mar '20

28 Mar '20

I'm getting 403 when trying to download boost from links at https://www.boost.org/users/history/version_1_72_0.html (https://www.boost.org/users/history/version_1_72_0.html) Is it just me? If not, how do we get this fixed? Thanks, Andrew

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[program_options] cmake error
by Jeanette C. 27 Mar '20

27 Mar '20

Hey hey, I get a cmake error about a non-existent directory from boost::program_options, namely /include . It only happens with the program_options library. Other libs included in the project are date_time, filesystem and system. A quick peak at /lib/cmake/boost_program_options-1.72.0/boost_program_options-config.cmake compared to the same file from date_time didn't give me any obvious hint though. But I'm not very familiar with cmake. The cmake line to find these Boost packages is this: find_package(Boost 1.58 REQUIRED COMPONENTS program_options filesystem date_time system) Here's the error message from my program's cmake: [...] Imported target "Boost::program_options" includes non-existent path "/include" in its INTERFACE_INCLUDE_DIRECTORIES. Possible reasons include: [...] Can someone reproduce the issue or suggest a fix? Best wishes and TIA, Jeanette -- * Website: http://juliencoder.de - for summer is a state of sound * Youtube: https://www.youtube.com/channel/UCMS4rfGrTwz8W7jhC1Jnv7g * SoundCloud: https://soundcloud.com/jeanette_c * Twitter: https://twitter.com/jeanette_c_s * Audiobombs: https://www.audiobombs.com/users/jeanette_c * GitHub: https://github.com/jeanette-c There's a girl in the mirror I wonder who she is Sometimes I think I know her Sometimes I really wish I did <3 (Britney Spears)

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[Boost.Graph] is it still active?
by Omar Khaled 27 Mar '20

27 Mar '20

Hey, I was wondering if the library is still active and open for refinements? I see that last **real** code written in it was committed to github repo from a year or so? are the maintainer still active? Thanks !!!

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Re: [Boost-users] Help with the steps needed to handle a large POST file upload
by Javier Sánchez 27 Mar '20

27 Mar '20

I'd suggest you take a look into the SmartUpload class in Java, I > understand it's a third party contribution. POST's that have attachments > have "parts" of their contents which are identified by their headers in the > MIME type. The logical thing to do is to loop through the several parts > and identify the one that you are expecting. If you are not exactly > looking after specific code I'd suggest you consult the RFC's related to > those types of contents in POST requests. There you'll have the key you > need. Regards. >

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Help with the steps needed to handle a large POST file upload (Boost Beast)
by Bill Moo 25 Mar '20

25 Mar '20

For anyone that has read my previous post, it will be evident from this request that I've not made any real progress of this, with my level of frustration rising, so I'm turning to the community again for assistance. Is anyone able to provide me with the steps I need to take to be able to download and save a 5 to 10 MB binary file submitted via a POST verb. I have tried many things but I simply can't get it to work, or work out the correct process. I'm not asking for code but the steps I need and where to take them in order to achieve my goal. Due to the size of the uploads I know I need to use a parser and I have search the internet for such an example to no avail so I would appreciate your help with this. The server I'm using is a single strand async implementation, derived from the Beast examples. -- Regards, Bill

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[gsoc] Example of exceptional project proposal
by Mateusz Loskot 24 Mar '20

24 Mar '20

...as it is not Dear students, if you aim to submit proposals like this, then please don't bother polluting the GSoC space with such rubbish. Please, let's display some minimum of professionalism and respect to each other. Best regards, -- Mateusz Loskot, http://mateusz.loskot.net

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Uploading a file to a Boost Beast Server
by Bill Moo 24 Mar '20

24 Mar '20

I am using Beast 277 and code from the advanced server example as the basis for my own one. As part of the functionality I need to allow users the ability to upload a file to the server via their browser. So I had a look at the 'Deferred Body Type' in the examples provided but I can't see how I can make use of it in my own server, although I have tried but fall foul of the SyncReadStream. Is there a working example anywhere of how I can capture and save a file uploaded to the server by a user please. -- Bill

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