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  • c++ volatile multithreading variables

    - by anon
    I'm writing a C++ app. I have a class variable that more than one thread is writing to. In C++, anything that can be modified without the compiler "realizing" that it's being changed needs to be marked volatile right? So if my code is multi threaded, and one thread may write to a var while another reads from it, do I need to mark the var volaltile? [I don't have a race condition since I'm relying on writes to ints being atomic] Thanks!

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  • fastest way to copy a table in mysql

    - by Anon
    which one is the fastest way to completely copy a table on mysql ? CREATE TABLE copy LIKE original; INSERT INTO copy SELECT * FROM original; or CREATE TABLE copy SELECT * FROM original; ALTER TABLE copy ADD PRIMARY KEY (id); or theres another way ? PS. can't use command-line tools like mysqldump, must be on-the-fly.

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  • Calling C/C++ library function from PHP

    - by Anon. BlackBerry Developer
    We have a PHP web app running on a customer's machine. For an update, we have a bit of code in C that we'd like to include as a native opaque library along with the PHP web app. How does one go about calling a C/C++ lib. function from PHP? It cannot be assumed that the PHP app, called by the web server, has any sort of permission to call an exec(), eval(), or system() type of function to execute a C wrapper driver which in turn uses the C/C++ library, so it would need to be a direct C library use from within the PHP code.

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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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  • g++ -fsyntax-only unit test

    - by anon
    I'm trying to figure out if g++ -fsyntax-only does only syntax checking or if it expands templates too. Thus, I ask stack overflow for help: is there to write a program so that syntactically it's valid, but when template expansion is done, an error occurs? Thanks!

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  • Hash Table v/s STL map in C++

    - by anon
    Hi, I am trying to learn C++ maps. Was just wondering about the implementation of STL map. I read it employs Binary search tree. Is there a implementation of hash table in STL? How exactly do STL map stores Key Value pairs?

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  • What am I missing in my compilation / linking stage of this C++ FreeType GLFW application?

    - by anon
    g++ -framework OpenGL GLFT_Font.cpp test.cpp -o test -Wall -pedantic -lglfw -lfreetype - pthread `freetype-config --cflags` Undefined symbols: "_GetEventKind", referenced from: __glfwKeyEventHandler in libglfw.a(macosx_window.o) __glfwMouseEventHandler in libglfw.a(macosx_window.o) __glfwWindowEventHandler in libglfw.a(macosx_window.o) "_ShowWindow", referenced from: __glfwPlatformOpenWindow in libglfw.a(macosx_window.o) "_MenuSelect", referenced from: This is on Mac OS X. I am trying to get GLFT_FONT to work on MacOSX with GLFW and FreeType2. This is not the standard Makefile. I changed parts of it myself (like the "-framework OpenGL" I am from Linux land, a bit new to Mac. I am on Mac OS X 10.5.8; using XCode 3.1.3 Thanks!

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  • [ruby] Check if file is a valid image

    - by some guy
    Hi all, I'm using rmagick to manipulate image files. I use the ImageList.new on each file to get started. When I apply this method to an invalid image file I get the below error which interrupts the execution of the script: RMagick.rb:1635:in `read': Improper image header (Magick::ImageMagickError) Therefore I would like to be able to check whether a file is a valid image file before using this method. Any ideas? Thanks.

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  • Is there anyway to write the following as a C/C++ macro?

    - by anon
    my_macro << 1 << "hello world" << blah->getValue() << std::endl; should expand into: std::ostringstream oss; oss << 1 << "hello world" << blah->getValue() << std::endl; ThreadSafeLogging(oss.str()); Thanks! EDIT: the accepted answer is awesome. Can we upvote 8 more times and win this responder a badge? (The answer only needs 6 more upvotes). 4 more votes to go from 21 to 25. 3 more. :-) Victory. :-)

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  • InfoPath Getting SharePoint Group Information

    - by anon
    I have an InfoPath form embedded in an aspx page on a SharePoint site. How do I bind the SharePoint user groups to a drop-down list on my form? What I've tried so far is to create a data connection to a web service (method GetGroupCollectionFromWeb) to pull the data. Next, I open the list box properties, select "Look up values from an external data source", select the data source, assign the entries, and I get the following error: "You must select a repeating group or field." What I don't understand is that since the method I am calling is called GetGroupCollectionFromWeb, isn't the return value a collection? And aren't collections repeating by definition? What am I missing, and is there a workaround? Thank you.

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  • Pass a variable to new page

    - by Anon
    I am trying to pass a variable from one page, load another and enter that information. something Like this: When 127.0.0.1/test.html&ID=1234 location.href = "127.0.0.1/newpage.html" if (location.href == newpage.html){ var e = document.GetElementById("Loginbx"); e.Value = ID } I don't have access to modify 127.0.0.1/test.html nor newpage.html but would like to pass variables to them from another. Is this possible?

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  • lua userdata c++ destructor

    - by anon
    In lua, for memory allocated with lua_newuserdata, is it possible to register a destructor, so that the destructor is called when the memory region is garbage collected by lua? Thanks!

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  • Python: Regex outputs 12_34 - I need 1234

    - by Guy F-W
    So I have input coming in like: 12_34 5_6_8_2 4___3 1234 and the output I need from it is: 1234, 5682, 43, 1234 I'm currently working with r'[0-9]+[0-9_]*'.replace('_','') which (as far as I can tell) successfully rejects any input which is not a combination of numeric digits and under-scores, where the underscore cannot be the first character. However, replacing the _ with the empty string causes 12_34 to come out as 12 and 34. Is there a better method than 'replace' for this? Or could I adapt my regex to deal with this problem?

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  • How to use all the cores in Windows 7?

    - by Anon
    I am not sure if this belongs to Stackoverflow or Superuser but I thought I would ask here. I have a console based application written in C which currently takes about an hour to terminate in Windows 7 64-bit OS. The task manager reports that the application is using only 25% of the available CPU. I would like to reduce the run time by increasing cpu usage. Is there any way to let the application use all four cores (the laptop has Core i5) instead of just one? I am assuming that task manager reports 25% because only one core is allocated to the program.

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  • C++ Variable declarable in function body, but not class member?

    - by anon
    I want to create a C++ class with the following type: It can be declared inside of a function. It can be declared inside of a member function. It can not be declared as a class member. The use of this: think "Root" objects for a GC. Is this possible in C++? In particular, I'm using g++. Willing to switch to clang. Either templates or macro solution fine. Thanks!

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  • Use applescript to write iCal data to file

    - by Guy
    I am trying to get applescript to read todays ical events and write them to a file. The code is as follows: set out to "" tell application "iCal" set todaysDate to current date set time of todaysDate to 0 set tomorrowsDate to todaysDate + (1 * days) repeat with c in (every calendar) set theEvents to (every event of c whose start date = todaysDate and start date < tomorrowsDate) repeat with current_event in theEvents set out to out & summary of current_event & " " end repeat end repeat end tell set the_file to (((path to documents folder) as string) & "DesktopImage:ical.txt") try open for access the_file with write permission set eof of the_file to 0 write out to the_file close access the_file on error try close access the_file end try end try return out The ical items are getting returned correctly and the file ical.txt is created correctly in the folder Documents/DesktopImage, but the file is blank. Even if I substitute write out to the_file with write "Test string" to the_file it still comes up blank any ideas? Ty

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  • C++: type Length from float

    - by anon
    This is kinda like my earlier question: http://stackoverflow.com/questions/2451175/c-vector3-type-wall Except, now, I want to do this to a builtin rather then a user created type. So I want a type "Length" that behaves just like float -- except I'm going to make it's constructor explicit, so I have to explicitly construct Length objects (rather than have random conversions flying around). Basically, I'm going into the type-a-lot camp.

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  • How to avoid links to map.root getting shortened?

    - by Guy C
    I have a Reports controller and various reports: http://localhost/reports/main/this_month http://localhost/reports/main/last_month http://localhost/reports/main/this_year I wanted http://localhost to default to http://localhost/reports/main/this_month. That is easy enough using map.root in my routes.rb. However when I do this any links to http://localhost/reports/main/this_month are now shortened to just http://localhost. I want the links to stay full

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