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• How to use boost::transform_iterator to iterate over modifed std::map values?

  - by Frank

  I have an std::map, and I would like to define an iterator that returns modified values. Typically, a std::map<int,double>::iterator iterates over std::pair<int,double>, and I would like the same behavior, just the double value is multiplied by a constant. I tried it with boost::transform_iterator, but it doesn't compile: #include…

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• Boost Regex unknown number of var

  - by Katrin Thielmann

  I got a Problem with a regex expression and need help. I have some expressions like these in mein .txt File: 19 = NAND (1, 19) regex expression : http://rubular.com/r/U8rO09bvTO With this regex expression i got seperated matches for the numbers. But now I need a regex expression with a unknown size of numbers in the bracket . For example: 19…

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• Exposing a pointer in Boost.Python

  - by Goose Bumper

  I have this very simple C++ class: class Tree { public: Node *head; }; BOOST_PYTHON_MODULE(myModule) { class_<Tree>("Tree") .def_readwrite("head",&Tree::head) ; } I want to access the head variable from Python, but the message I see is: No to_python (by-value) converter found for C++ type: Node* …

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• multi-dimension array value sorting in php

  - by David

  Another potentially interesting (or n00b, whatever comes first) question. I am building up an array with a set of database fields with information about table, actual field name and descriptive field name as a multi-dimensional array. Here is what it currently looks like: $Fields['User']['ID'] = "User ID"; $Fields['User']['FirstName'] =…

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• Converting 3 dimension byte array to a single byte array [on hold]

  - by Andrew Simpson

  I have a 3 dimensional byte array. The 3-d array represents a jpeg image. Each channel/array represents part of the RGB spectrum. I am not interested in retaining black pixels. A black pixel is represented by this atypical arrangement: myarray[0,0,0] =0; myarray[0,0,1] =0; myarray[0,0,2] =0; So, I have flattened this 3d array out…

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• boost::spirit (qi) decision between float and double

  - by ChrisInked

  I have a parser which parses different data types from an input file. I already figured out, that spirit can decide between short and int, for example: value %= (shortIntNode | longIntNode); with shortIntNode %= (qi::short_ >> !qi::double_) [qi::_val = phoenix::bind(&CreateShortIntNode, qi::_1)];…

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• Partial string search in boost::multi_index_container

  - by user361699

  I have a struct to store info about persons and multi_index_contaider to store such objects struct person { std::string m_first_name; std::string m_last_name; std::string m_third_name; std::string m_address; std::string m_phone; person(); person(std::string f, std::string l, std::string t = "",…

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• Boost Test dynamically or statically linked?

  - by Halt

  We use Boost statically linked with our app but now I wan't to use Boost Test with an external test runner and that requires the tests themselves to link dynamically with Boost.Test through the use of the required BOOST_TEST_DYN_LINK define. Is this going to be a problem or is the way Boost Test links completely unrelated…

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• boost.asio's socket's recieve/send functions are bad?

  - by the_drow

  Data may be read from or written to a connected TCP socket using the receive(), async_receive(), send() or async_send() member functions. However, as these could result in short writes or reads, an application will typically use the following operations instead: read(), async_read(), write() and …

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• Convert Array to Multidimensional Array

  - by Tim

  I like to convert a single array into a multidimensional array. This is what I get have web scraping a page, except it is not the end result that I am looking for. Change: Rooms: Array ( [0] => name [1] => value [2] => size [3] => &nbsp; [4] => name [5] => value [6] =>…

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• upgrading boost version

  - by idimba

  I'm using RHEL 5.3, shipped with gcc 4.1.2 and boost 1.33. So, there's no boost::unorded_map, no make_shared() factory function to create boost::shared_ptr and other features available in newer releases of boost. Is there're a newer version of boost compatible with the version of gcc? If yes, how the upgrade is…

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• How would you practice concurrency and multi-threading?

  - by Xavier Nodet

  I've been reading about concurrency, multi-threading, and how "the free lunch is over". But I've not yet had the possibility to use MT in my job. I'm thus looking for suggestions about what I could do to get some practice of CPU heavy MT through exercises or participation in some open-source projects. …

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• Matching array elements to get an array element at another index

  - by bccarlso

  I have a PHP array that I'm using to generate an HTML form. The PHP array is this: <?php $vdb = array ( array( "Alabama", 275), array( "Alaska", 197), array( "Arizona", 3322)); ?> The PHP to generate the HTML form is below. I need…

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• Using boost::random as the RNG for std::random_shuffle

  - by Greg Rogers

  I have a program that uses the mt19937 random number generator from boost::random. I need to do a random_shuffle and want the random numbers generated for this to be from this shared state so that they can be deterministic with respect to the mersenne twister's previously generated numbers. I tried…

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• Multi-tenant ASP.NET MVC - Views

  - by zowens

  Part I – Introduction Part II – Foundation Part III – Controllers   So far we have covered the basic premise of tenants and how they will be delegated. Now comes a big issue with multi-tenancy, the views. In some applications, you will not have to override views for each tenant. However,…

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• Formula needed: Sort array to array-"snaked"

  - by aw

  After the you guys helped me out so gracefully last time, here is another tricky array sorter for you. I have the following array: a = [1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16] I use it for some visual stuff and render it like this: 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 Now I…

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• Finding position of each word in a sub-array of a multidimensional array

  - by Shreyas Satish

  I have an array: tokens = [["hello","world"],["hello","ruby"]] all_tokens = tokens.flatten.uniq # all_tokens=["hello","world","ruby"] Now I need to create two arrays corresponding to all_tokens, where the first array will contain the position of each word in sub-array of tokens. I.E Output: …

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• is Boost Library's weighted median broken?

  - by user624188

  I confess that I am no expert in C++. I am looking for a fast way to compute weighted median, which Boost seemed to have. But it seems I am not able to make it work. #include <iostream> #include <boost/accumulators/accumulators.hpp> #include…

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• trying to build Boost MPI, but the lib files are not created. What's going on?

  - by unknownthreat

  I am trying to run a program with Boost MPI, but the thing is I don't have the .lib. So I try to create one by following the instruction at http://www.boost.org/doc/libs/1_43_0/doc/html/mpi/getting_started.html#mpi.config The instruction says "For many…

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• Converting array to Drupal format

  - by theo

  Hi all, This statement gives me the value I want in Drupal (namely the last user role): global $user; return (end($user->roles)); however I need to convert it to this format: return array( 0 => array('value' => value for value), //…

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• Prototype.js: How can i return an array without all the methods Prototypes extends Array with?

  - by Morten

  Hi! Is there a way to return a new version of an array/hash that does not contain all the methods/functions that prototype extends the array object with? Example: var myArray = $A(); myArray['test'] = '1'; myArray['test2'] = '2'; var…

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• Do newer versions of BJam support backwards compatibility with older versions of Boost?

  - by cmmacphe

  I'm trying to build version 1.35 of Boost with the newest version of bjam that is bundled with version 1.42 Boost. Will this adversely affect the results of the build? Is this even possible? The reason I'm trying to do this is because…

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• Can't figure out where race condition is occuring

  - by Nik

  I'm using Valgrind --tool=drd to check my application that uses Boost::thread. Basically, the application populates a set of "Book" values with "Kehai" values based on inputs through a socket connection. On a seperate thread, a user…

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• Boost::Asio - Remove the "null"-character in the end of tcp packets.

  - by shump

  I'm trying to make a simple msn client mostly for fun but also for educational purposes. And I started to try some tcp package sending and receiving using Boost Asio as I want cross-platform support. I have managed to send a…

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• display an array in html table

  - by Davi

  I have this array: Array ( [page] => Array ( [0] => add [1] => edit [2] => delete [3] => search ) [category] => Array ( …

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