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• Method parameter that can take an object or a nil?

  - by Dan Ray

  How do I spell a method whose argument can either be an object of a certain type, or nil? You see those all the time in framework classes, but I've just encountered my first instance where it would be useful to create one.

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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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• Regions in Delphi - is it possible to define them unfold by default?

  - by ntodorov

  Since Delphi 2005 Borland/CodeGear introduced the regions in the IDE. It is good idea but in some casses I want my reginos to be unfolded by default in other folded. If there argument or options that will do the job? I'm using Delphi 2007.

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• How to treat RAM data as if it was a real file?

  - by Ole Jak

  So I have some temp data in my prorram (in RAM) I want to somehow make it seem as it is file (for example for sending it into another program which takes a file link as argument)? Is it possible? How to do such thing?

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• I have a following gcc compilation warning

  - by thetna

  symbol.h:179: note: expected ‘uintptr_t *’ but argument is of type ‘PRECEDENCE’ The corresponding code is : 176 void symbol_SetCount(SYMBOL, unsigned long); 177 unsigned long symbol_GetCount(SYMBOL); 178 179 size_t symbol_Ordering(uintptr_t*, SYMBOL); 180 181 void symbol_CheckIndexInRange(int); 182 void symbol_CheckNoVariable(SYMBOL); SYMBOL is defined as: typedef size_t SYMBOL Any effort will be highly appreciated.

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• Does a syntax for this exist? In any language?

  - by Michael

  It seems pretty common to me to have an argument, in a dynamically typed language that is either an Object or a key to lookup that object. For instance when I'm working with a database I might have a method getMyRelatedStuff(person) All I really need to lookup the related stuff is the id of the person so my method could look like this in python: def getMyRelatedStuff(person_or_id): id = person_or_id.id if isinstance(person,User) else person_or_id #do some lookup Or going the other direction: def someFileStuff(file_or_name): file = file_or_name if hasattr(file,'write') else open(file_or_name)

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• C++ choose function by return type.

  - by anon

  I realize standard C++ only picks functions by argument type, not return type. I.e I can do something like: void func(int); void func(double); but not double func(); int func(); Where in the former, it's clear, in the latter, it's ambigious. Are there any extensions that lets me tell C++ to pick which function to use also by return type? Thanks!

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• How to make this if statement in bash

  - by Selmak

  Hi, I'm having a hard time figuring out how to do this if statement. I want to do this: IF (the function has only 1 argument AND $1 is a directory (in the current folder)) OR IF (the function has 2 arguments AND $1 is NOT a directory ) THEN .... END Sorry if it's not very clear, Thanks in advance

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• Get a list/tuple/dict of *all* the arguments passed to a function?

  - by Phillip Oldham

  Given the following function: def foo(a, b, c): pass How would one obtain a list/tuple/dict/etc of the arguments passed in? Specifically, I'm looking for Python's version of JavaScript's arguments keyword or PHP's func_get_args() method. What I'm not looking for is a solution using *args or **kwargs; I need to specify the argument names in the function definition (to ensure they're being passed in) but within the function I want to work with them in a list- or dict-style structure.

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• How to learn to use make? I'm never ever able to build sources with make and makefiles

  - by Petruza

  Hi, I'm new to *N*X OSes, actually MacOS, and when I try to build sources with make and makefiles, I never can. I try to run make, even try to run it passing the makefile as an argument, but all I get is "There's nothing for make to do" Can you point me to a tutorial, reference, or something ?

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• Not Possible to Reference self in a Method Declaration?

  - by phasetwenty

  I wanted to write a method with an argument that defaults to a member variable like so: def method(self, arg1=0, arg2=self.member): Apparently this is not allowed. Should I write it a different way, or perhaps use a value of arg2 to signal when to use a different value?

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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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• Perl and hosts file mapping question?

  - by user275633

  All, I have a hosts file that looks like this: 10.10.10.1 myserver1 myserver1alias 10.10.10.2 myserver2 myserver2alias I'm looking for a way using perl to pass in an argument of myserver1 and have it return myserver1alias, likewise if I pass in myserver2 it should return myserver2alias. Any suggestions?

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• How to call Java method from C++

  - by fhucho

  Hi, I am using JNI to call my C++ function from Java. One of the C++ function's arguments is jobject thiz (as far as I know, all JNI native functions have this argument). The function takes quite long to complete and I want to report progress back to the jobject thiz Java object, so that I can show the progress to the user. How can I call jobject's methods from C++?

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• How can I have a newline in a string in sh?

  - by juannavarroperez

  This STR="Hello\nWorld" echo $STR produces as output Hello\nWorld instead of Hello World What should I do to have a newline in a string? I'm aware of echo -e, but I'm no sending the string to echo, the string will be used as an argument by another command that doesn't know how to interpret \n as a newline.

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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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• C++: Trouble with tr1::bind (C2065)

  - by Rosarch

  I'm getting a compiler error with bind: using namespace std; bool odp(int arg1, int arg2); // ... find_if(vec.begin(), vec.end(), tr1::bind(odp, iValue, _1)); // C2065 My goal is to curry odp(), so its first argument is iValue, and apply that function in find_if. The error: C2065: '_1' : undeclared identifier. What am I doing wrong?

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• Java, user input to the command line when using Runtime.getRuntime().exec(command);

  - by user1557354

  I dont think this is possible, but I have been using: Process p = Runtime.getRuntime().exec(command); to run commands on the command line, but now I have come accross a situation where the command I am running part way through will ask for some user input, for example a username. This can not be resolved by a argument to the command that is being exec, is there any way I can pass the username to the same command line instance and continue? Thanks in advance.

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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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• Does malloc(0) return a valid pointer or NULL?

  - by Jaspreet

  Hi Malloc() is used for dyamic memory allocation and returns a pointer (void*) to the memory allocated. What happens if i pass zero in malloc as an argument. Does a valid memory allocation takes place? Explain

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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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• 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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• Why do contains()/indexOf() in a Java collections use o.equals(e) and not e.equals(o)?

  - by Fernando

  Why are the methods contains() and indexOf() in the Java collections framework defined using o.equals(e) and not e.equals(o) (where o is the argument of the methods and e is the element in the collection)? Anyone know the reasons of that?

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• Can I post-back <asp:HiddenField>'s value modified with JS

  - by Ricky

  Hi guys: As title, would this raise the same problem like http://stackoverflow.com/questions/228969/asp-net-invalid-postback-or-callback-argument-event-validation-is-enabled-usi ? Thank you

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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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