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• Is there any cross-platform threading library in C/C++?

  - by NumberFour

  Hello, I'm looking for some easy to use cross-platform threading library written in C/C++. What's your opinion on boost::thread or Pthreads? Does Pthreads run only on POSIX compliant systems? What about the threading support in the Qt library? Thanks for any hints.

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• What should my teacher talk about in my Advanced C++ class? [advice needed]

  - by Goose Bumper

  My teacher for Advanced C++ has opened the class up for students to suggest whatever topics we want. What are some good advanced C++ topics to know? We've already covered: template metaprogramming the STL (obviously) introduction to the boost libraries Please give reasons for suggestions as well.

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• How do I combine hash values in C++0x?

  - by Neil G

  C++0x adds hash<...>(...). I could not find a hash_combine function though, as presented in boost. What is the cleanest way to implement something like this? Perhaps, using C++0x xor_combine?

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• How to set configuration properties in VS once and for all?

  - by atch

  In VS 2010RC I have to specify configuration properties and specifically included path every time I'm creating new project. Is there a way to do it just once for all future projects? I'm asking this for a reason that I'm starting to use Boost libraries and I have to specify all those paths every time I'm creating project which is bit tedious.

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• Debugging with cgdb -- want to debug only my code

  - by rkbang

  Hello all, I am using standard template libraries along with boost. I want to debug code using cgdb. But I just want to debug my code while doing next and step in cgdb, like right now it enters the code in other libraries whereas I want it should just return or step into the code which I have coded and wrote down. Is there any way to make this happen.

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• Sorting a 2 dimensional array on multiple columns

  - by Anon

  I need to sort a 2 dimensional array of doubles on multiple columns using either C or C++. Could someone point me to the algorithm that I should use or an existing library (perhaps boost?) that has this functionality? I have a feeling that writing a recursive function may be the way to go but I am too lazy to write out the algorithm or implement it myself if it has been done elsewhere. :-) Thanks

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• Is there any standard delete functor?

  - by FredOverflow

  I am looking for a functor that deletes its argument: template<class T> struct delete_functor { void operator()(T* p) { delete p; } }; Is there something like this in std, tr1 or boost?

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• Calendar control GUI C++ library

  - by Dmitriy

  Who knows a good component for a "calendar control" (NOT date/time picker)? "Calendar control" means something like Mozilla Sunbird: Requirements to the control: - C++; - Day/Week/Month view; - Support of several calendars; - Without MFC dependences; Nice to have: - Open source; - Cross plathform; - Free; - Minimum external dependences (boost etc are fine);

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• Compilation error with C++ templates. Is there any easy way to understand them?

  - by Naveen

  While working with the C++ templates (most of the time using STL or boost) I run into the compilation errors that are miles long. I find it hard to figure out what compiler is trying to tell me. Is there any quick reference guide or a tool which can convert this error into something more understandable to humans?

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• event handling in C++

  - by Max

  Hi. I'm writing a game in C++, and I'm trying to get it to recognize keyboard and mouse events. Google tells me that boost.signal is suitable for event handling, but none of the code samples or tutorials I've found tell me how to associate a keypress or mouseclick with a function. Can anyone shed any light on this?

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• C/C++ pragma in define macro

  - by aaa

  is there some way to embed pragma statement in macro with other statements? I am trying to achieve something like: #define DEFINE_DELETE_OBJECT(type) \ void delete_ ## type_(int handle); \ void delete_ ## type(int handle); \ #pragma weak delete_ ## type_ = delete_ ## type I am okay with boost solutions (save for wave) if one exists. thank you

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• Python Logging across multiple classes and files; how to configure so as to be easily disabled?

  - by mellort

  Currently, I have osmething like this in all of my classes: # Import logging to log information import logging # Set up the logger LOG_FILENAME = 'log.txt' logging.basicConfig(filename=LOG_FILENAME,level=logging.DEBUG) This works well, and I get the output I want, but I would really like to have all this sort of information in one place, and be able to just do something like import myLogger and then start logging, and then hopefully be able to just go into that file and turn off logging when I need an extra performance boost. Thanks in advance

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• Small but hard programming tasks (Complete apps as opposed to Euler)

  - by dotnetdev

  I have a bit of free time at work and was wondering, what are some hard applications to build but which are not big? Hopefully nothing which requires specialist knowledge but something nonetheless hard and which will boost my coding/problem-solving skills. Thanks

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• Find out the number of digits of min/max values of an integral type at compile time

  - by Checkers

  Is there a way to find out the number of digits of min/max values of an integral type at compile time so that it's suitable to be placed as a template parameter? Ideally, there will be an existing solution in, for example, Boost MPL. Failing that I'm looking for some pointers for a hand-coded solution.

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• Java standard library - graph?

  - by Amir Rachum

  Is there a representation of a graph in Java standard libraries, like there is in the boost library in C++? Is there a graph representation which is a standard in the business?

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• C++ parent class alignment

  - by aaa

  hello. Is it possible to specify alignment of parent class? for example something like (which does not compiled): template<size_t n> class Vector : public boost::array<double,n> __attribute__ ((aligned(16))) { thanks

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• C++ template instantiation with identity argument

  - by aaa

  hello. I have ran into yet another problem I do not understand. The following does not instantiate, why? template<class E> void operator[](typename boost::mpl::identity<E>::type e) const; thank you for your help

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• Prohibiting copy construction and copy assignment in C++

  - by Jack Nock

  To prohibit copy construction and copy assignment, I've seen the boost noncopyable class and in the Google style guide the DISALLOW_COPY_AND_ASSIGN macro. Is there any reason to prefer one of the techniques over the other, or any subtle differences one should be aware of?

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• Gzip In-Memory Compression

  - by feal87

  Quick and simple question. There are examples online about achieving in-memory gzip compression with zlib (C++) WITHOUT external libraries (like boost or such)? I just need to compress and decompress a block of data without much options. (it must be gzip as its the same format used by another mine C# program (the data is to be shared)) Tried to search to no avail... Thanks!

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• C++ Expose Already Existing Instance of Objects to a Scripting Language

  - by user947871

  So, I want to be able to modify already instanced C++ objects in a scripting language. I have been looking at Lua with LuaBind and Python with SWIG or Boost::Python, but all I see is how to make new instances of the objects, but I want to modify already existing ones. Example: C++: Player playerOne = new Player(); Scripting Language : playerOne.Transform.x += 5; Is this possible, and if so, wat would you suggest as a good Language/library to achieve this with?

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• How can i convert from wostream to ostream

  - by Avishay

  i am using a function that receives ostream but i have wostream is there a way to convert one to the other? in particular i want to use boost::write_graphviz which takes ostream but i currently in << operator for wostream.

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• How can I have a Foo* iterator to a vector of Foo?

  - by mghie

  If I have a class that contains a std::list<Foo>, how can I implement iterators to a Foo* collection, preferably without using boost? I'd rather not maintain a parallel collection of pointers. For now I have std::list<Foo>, mostly so that removing or inserting an element does not invalidate all other iterators, but would it be possible to implement other iterators too, so that the collection type used in the implementation is opaque to the user of the class?

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• C++ write to front of file

  - by user231536

  I need to open a file as ofstream and write to the front of the file, while preserving the remaining contents of the file, which will be "moved". Similar to "prepend" a file. Is this possible using the STL or boost ?

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• C++ STL-conforming Allocators

  - by myahya

  What allocators are available out there for use with STL when dealing with small objects. I have already tried playing with pool allocators from Boost, but got no performance improvement (actually, in some cases there was considerable degradation).

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• How do I check if a process is running from c++ code ?

  - by Maciek

  Hey all, I'm writing a C++ app that will communicate with another process via boost::interprocess, however I need to check if the other process is actually running first - as the other process is responsible for creating the inter-process shared memory. How do I check if the other process is running ? folks, I'm specifically required to check other processes

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