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• How do I write the function 'twice' in Haskell?

  - by kunjaan

  I want to write 'twice' function that takes a function and an argument and applies the function twice. However the function that it receives should work on union types. eg. f a -> b f b -> c Output twice f a c f a b f b c f c error

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• Bash, no-arguments warning, and case decisions

  - by Werner

  Hi, I am learning bash. I would like to do a simple script that, when not arguments given, shows some message. And when I give numers as argument,s depending on the value, it does one thing or another. I would also like to know suggestions for the best online manuals for beginners in bash Thanks

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• Django: saving pickled object

  - by pistacchio

  Hi, i have a large dictionary I'd like to save. I have pickled it using cPickle.dumps and saved the result into a TextField. When trying to retrieve it (cPicle.loads) i get the following error: loads() argument 1 must be string, not unicode Does anybody have any experience in serializing python objects and storing them in a DB using Django? Thanks in advance.

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• C++: combine const with template arguments

  - by awn

  The following example is working when I manualy replace T wirh char *, but why is not working as it is: template <typename T> class A{ public: A(const T _t) { } }; int main(){ const char * c = "asdf"; A<char *> a(c); } When compiling with gcc, I get this error: test.cpp: In function 'int main()': test.cpp:10: error: invalid conversion from 'const char*' to 'char*' test.cpp:10: error: initializing argument 1 of 'A<T>::A(T) [with T = char*]'

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• Regex to find A and not B on a line

  - by Zach

  I'm looking for a regex to search my python program to find all lines where foo, but not bar, is passed into a method as a keyword argument. I'm playing around with lookahead and lookbehind assertions, but not having much luck. Any help? Thanks

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• SeFocus causing Run time error

  - by code8230

  I am getting: Run-time error '5': Invalid procedure call or argument this seems to happen when Text(1).SetFocus is called. However, I dont see this run time error for all the cases where I have used SetFocus. Just 2-3 places it is causing this error. Text(1).SelStart = 3 Text(1).SelLength = 1 Text(1).SetFocus I tried: Text(1).Enabled = True Text(1).Visible = True just above .SelStart, but it didn't fix the issue.

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• Grepping for string containing dash

  - by Mike

  I want to grep for the string "-X" in a file but it's confusing this as a command line argument. I've tried grep "-X" grep \-X grep '-X'

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• cast error->System.Windows.Forms.DataGridViewSelectedCellCollection' does not contain a definition f

  - by user361108

  hi friend i m getting that error can any one plz help 'System.Windows.Forms.DataGridViewSelectedCellCollection' does not contain a definition for 'Cast' and no extension method 'Cast' accepting a first argument of type 'System.Windows.Forms.DataGridViewSelectedCellCollection' could be found (are you missing a using directive or an assembly reference?)

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• Hook perm for more than one content type

  - by Andrew

  Drupal 6.x I have this module that manages four different content types. For that matter, how do I define permission for each content within the same module? Is that even possible? I can't figure out how to define permission for each content type cuz hook_perm has to be named with module name and it doesn't have any argument(like hook_access $node) to return permission base on content type. Any help would be highly appreciated.

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• Tracing the Memory/Window Leaks in Android?

  - by Praveen Chandrasekaran

  How to trace the Memory Leaks in Android Development? I am working on eclipse IDE to develop the application. i cant find out how to rectify the memory or window Leaks Exceptions? Any Idea. Mainly the Window Leaked error raises the Illegal Argument Exception? how to rectify both og this. Please Help.

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• Resharper intellisense confusion

  - by Mystere Man

  Today I had something weird happen in my copy of Resharper 5. I have a class that looks like this: public class Foo { public string Username { get; private set; } public Foo (string userName) { Username = userName; } public void Bar() { DoWork(Username); } public DoWork(string userName) { } } When I start to type DoWork(us I get the following from intellisense: Notice that it's pulling up the constructor argument, and it ends with a colon: userName: What's going on here?

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• Check directory for files, retrieve first file

  - by Lowgain

  I'm writing a small ruby daemon that I am hoping will do the following: Check if a specific directory has files (in this case, .yml files) If so, take the first file (numerically sorted preferrably), and parse into a hash Do a 'yield', with this hash as the argument What I have right now is like: loop do get_next_in_queue { |s| THINGS } end def get_next_in_queue queue_dir = Dir[File.dirname(__FILE__)+'/../queue'] info = YAML::load_file(queue_dir[0]) #not sure if this works or not yield info end I'd like to make the yield conditional if possible, so it only happens if a file is actually found. Thanks!

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• Iterating through struct fieldnames in MATLAB.

  - by Noio

  My question is easily summarized as: "Why does the following not work?" teststruct = struct('a',3,'b',5,'c',9) fields = fieldnames(teststruct) for i=1:numel(fns) fns(i) teststruct.(fns(i)) end output: ans = 'a' ??? Argument to dynamic structure reference must evaluate to a valid field name. Especially since teststruct.('a') does work. And fns(i) prints out ans = 'a'. I can't get my head around it.

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• command line arg?

  - by kaushik

  This is a module named XYZ. def func(x) ..... ..... if __name__=="__main__": print func(sys.argv[1]) Now I have imported this module in another code and want to use the func. How can i use it? import XYZ After this, where to give the argument, and syntax on how to call it, please?

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• How to run multiple arguments in Cygwin

  - by danutenshu

  I've been trying to run a program that will invert the order of a string and to run it, I have to type a second argument in prompt. int main(int argc, char* argv[]) { string text = argv[2]; for (int num=text.size(); num>./0; num--) { cout << text.at(num); } return 0; } e.g. ./program lorem result: merol

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• Why -use-network=false

  - by dejaninic

  Hi guys. Dose anyone knows why I have to use -use-network=false in my Flex Builder?!?!?! This is set inside the Project Properties and is Additional compiler argument. This is only when I want to read in a external file like XML. Others in my team doesn't have to have -use-network=false ????

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• C++ Pass a hidden arg to a class constructor?

  - by JP

  I would like to define a class that accept the pointer to it's parent class as an Argument, but would it be possible to somehow pass it without needing to pass it directly such as: class Child { public: Child(Parent* hiddenArg); }; class Parent { public: Child myChild; }; I know this is weird, but I am making my own Signal/Slot implementation and Child would be a signal defined, but I would like to get the parent so I can use it's Event Dispatcher...

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• Which is better: Ad hoc queries, or stored procedures?

  - by Will

  Assuming you can't use Linq for whatever reason, is it a better practice to place your queries in stored procedures, or is it just as good a practice to execute ad hoc queries against the database (say, Sql Server for argument's sake)?

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• how can I get around no arrays as class constants in php?

  - by user151841

  I have a class with a static method. There is an array to check that a string argument passed is a member of a set. But, with the static method, I can't reference the class property in an uninstantiated class, nor can I have an array as a class constant. I suppose I could hard code the array in the static method, but then if I need to change it, I'd have to remember to change it in two places. I'd like to avoid this.

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• What is your the worst program/project you have done so far in your programming career?

  - by Bragaadeesh

  Few years before, I attended an interview for a company. I was given a programming assignment and I wrote a code which I thought at that time was perfect. But now after 3 years when I look back, I cannot find a more horrible code than that. Not to indulge in a lengthy subjective argument. But I would like to know what is the worst set of code you've developed/written?

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• How can I retrieve two values from jquery-autocomplete

  - by RedMist

  I need my application to auto-complete on a company name, but also fill in a hidden form field with the ID of that company selected. I believe it's possible to return pair values, with the pipe separator, such as........ Microsoft|10 Oracle|20 Sybase|30 And indeed this seems to work, but I don't know how to access the 2nd argument.

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• Should we drop stored procedures and run database calls from java programs.

  - by Doug

  I am fighting to keep the use of stored procedures in our company. There are a few people who say they are bad and we should not use them. We are using DB2 on the i-series. Please help in my argument to keep stored procedures alive in my company.

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• LINQ: How do I concatenate a list of integers into comma delimited string?

  - by Haoest

  It's probably something silly I missed, but I try to concatenate a list of integers instead of summing them with: integerArray.Aggregate((accumulator, piece) => accumulator+"," + piece) The compiler complained about argument error. Is there a slick way to do this without having to go through a loop?

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• Why is this simple hello world PHP code not working?

  - by Silva

  class saySomething { var $helloWorld = 'hello world'; function sayHelloWorld($helloWorld) { echo $helloWorld; } } $saySomething = new saySomething(); $saySomething->sayHelloWorld(); the above gives this error: Warning: Missing argument 1 for saySomething::sayHelloWorld(), called in C:\xampp\htdocs\test.php on line 15 and defined in C:\xampp\htdocs\test.php on line 7

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• Perl, sub with two lists as arguments

  - by Mike

  Is it possible to pass two lists to a sub in Perl , ex sub Foo { my(@list1,@list2) = @_; } I know I could make @_ two lists, with each sublist being the desired argument, I'm just wondering if there is a cleaner way

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