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• How would I reverse an array of characters?

  - by jreicher

  Lets say I have an array of characters: char* foo = "abcdefg"; How would I reverse them but keep them within the array "foo"?

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• In Vim, how to swap 2 non adjacent patterns?

  - by ThG

  I have lines of text, all with the same structure, and would like to make a permutation of 2 elements on all lines: 1257654 some text (which may be long) #Foo 1543098 some other text #Barbar 1238769 whatever #Baz 2456874 something else #Quux I want to obtain : #Foo some text (which may be long) 1257654 #Barbar some other text 1543098 #Baz whatever 1238769 #Quux something else 2456874 This is where I am stuck : :%s/\(\d\{7\}\)\(#.\{-}\)/\2\1/ Where did I go wrong ?

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• Are PHP5 objects passed by reference?

  - by morpheous

  I cant seem to get any consistent info on this. Different sources appear to say different things and trhe venerable php.net iteslf (appears) not to explicitly state this - although I must admit, I only had a quick look. In cases where I am passing around 'heavy' objects, I need to pass by reference, but I dont want to keep typing: function foo(TypeName& $obj) if I can get away with simply, function foo(TypeName $obj) So what does the standard say?

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• Is there a equivalent in C for C++ templates?

  - by nunos

  In the code I am writing I need a foo(int, char*) and a foo(int, int) functions. If I was coding this in C++ I would use templates. Is there any equivalent for C? Or should I use void pointers? How? Thanks.

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• Ruby multiple background threads

  - by turri

  I need to run multiple background threads in a thread pool with timeout. The scheme is something like: #!/usr/bin/env ruby require 'thread' def foo(&block) bar(block) end def bar(block) Thread.abort_on_exception=true @main = Thread.new { block.call } end foo { sleep 1 puts 'test' } Why if i run that i get no output? (and no sleep wait?)

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• In Javascript, if there is an object with a lot of properties that are functions, how do you convert

  - by Jian Lin

  In Javascript, if an object has lots of properties that are functions: var obj = { foo: function() { ... }, bar: function() { ... }, ... } then how can you get an array of names of those functions? That is, an array ["foo", "bar", ... ] thanks.

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• Initialising a reference member with itself legal?

  - by epronk

  This was a bug I found in a server application using Valgrind. struct Foo { Foo(const std::string& a) : a_(a_) { } const std::string& a_; }; with gcc -Wall you don't get a warning. Why is this legal code?

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• Multithreaded ActiveRecord requests in rspec

  - by jeem

  I'm trying to recreate a race condition in a test, so I can try out some solutions. I find that in the threads I create in my test, ActiveRecord always returns 0 for counts and nil for finds. For example, with 3 rows in the table "foos": it "whatever" do puts Foo.count 5.times do Thread.new do puts Foo.count end end end will print 3 0 0 0 0 0 test.log shows the expected query, the expected 6 times: SELECT count(*) AS count_all FROM `active_agents` Any idea what's going on here?

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• Do I have to initialize simple class member variables?

  - by Frank

  Quick beginner's question: Do I have to initialize simple class member variables, or are they guaranteed to get assigned their default values in any case? Example: class Foo { int i; // is i==0 or do I need the following line for that? Foo() : i(0) {} }; Thanks!

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• C++ static array leading to memory leak?

  - by MDonovin

  Lets say I have something like... void foo() { char c[100]; printf("this function does nothing useful"); } When foo is called, it creates the array on the stack, and when it goes out of scope, is the memory deallocated automatically? Or is c destroyed, but the memory remains allocated, with no way to access it/get it back except restarting the computer?

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• Dumb RichTextBox question

  - by John Williams

  I need to get a list of tags in a text, make their contents bold, and remove them. Can't figure out how to make it. E.g. with the following input: foo [b]bar[/b] The result should be: foo bar I use the following code to extract the tags: Dim matches = Regex.Matches(OriginalRich.Text, String.Format("(\[{0}\])(.*?)(\[/{0}\])", tag), RegexOptions.IgnoreCase Or RegexOptions.Compiled) Any help would be appreciated.

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• Instantiating a generic class in Java

  - by ripper234

  I know Java's generics are somewhat inferior to .Net's. I have a generic class Foo<T>, and I really need to instantiate a T in Foo using a parameter-less constructor. How can one work around Java's limitation?

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• What ways are there to edit a function in R?

  - by Tal Galili

  Let's say we have the following function: foo <- function(x) { line1 <- x line2 <- 0 line3 <- line1 + line2 return(line3) } And that we want to change the second line to be: line2 <- 2 How would you do that? One way is to use fix(foo) And change the function. Another way is to just write the function again. Is there another way? (Remember, the task was to change just the second line)

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• C# equivalent of typeof for fields

  - by rwallace

  With reflection, you can look up a class from a string at run time, but you can also say typeof(Foo) and get compile time type checking, auto completion etc. If what you want is a field not a class, you can look it up from a string at runtime, but if you want compile time type checking etc., is there anyway to say something like fieldof(Foo.Bar)? I know the name of both the class and the field in advance, and I want to be able to refer to the field at compile time rather than with a run-time string lookup.

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• Why does this generate a segmentation fault?

  - by avd

  #include<stdio.h> void foo(int **arr) { arr[1][1]++; } main() { int arr[20][20]; printf("%d\n",arr[1][1]); foo((int**)arr); printf("%d\n",arr[1][1]); }

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• Test if a method is an override?

  - by Water Cooler v2

  Is there a way to tell if a method is an override? For e.g. public class Foo { public virtual void DoSomething() {} public virtual int GimmeIntPleez() { return 0; } } public class BabyFoo: Foo { public override int GimmeIntPleez() { return -1; } } Is it possible to reflect on BabyFoo and tell if GimmeIntPleez is an override?

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• How to find where error is.

  - by gurugio

  How can I find where the error occurs? In C language, the return value means what error occurs, such as failure to open file or memory allocation. There is no information where the error occurs. For example, function 'foo' calls A,B,C,D. If foo returns an error value, it might be return value of A or B or C or D. I cannot find what function returns error. I have to run debugger or add some codes to find what function returns error.

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• How do I add an attribute using XSLT?

  - by kunjaan

  I have an xml like this: <person name="foo" gender = "male" /> I want to transform it to <person id="foo" gender="male" /> Is there a way to do that using XSLT?

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• Representing a number in a byte array (java programming)

  - by Mark Roberts

  I'm trying to represent the port number 9876 (or 0x2694 in hex) in a two byte array: class foo { public static void main (String args[]) { byte[] sendData = new byte[1]; sendData[0] = 0x26; sendData[1] = 0x94; } } But I get a warning about possible loss of precision: foo.java:5: possible loss of precision found : int required: byte sendData[1] = 0x94; ^ 1 error How can I represent the number 9876 in a two byte array without losing precision?

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• Adding String to this in jQuery

  - by Phonethics

  If this is an HTMLDivElement, how do I avoid doing this ? $('#' + $(this).id + " > p").foo(); to do something like : ($(this) + $( " > p")).foo();

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• Timing issue with jQuery and $(document).ready()

  - by ripper234

  I have the following code block code when the document is ready: $(document).ready(function() { createDivs(); // creates some divs with class 'foo'; // iterate $(".foo").each(function(index) { alert(index + " - " + $(this).text()); }); } I find that the "iterate" part misses the divs I created in the createDivs() method entirely! Is there some timing issue I'm not aware of? Why doesn't jquery see the divs that were just created?

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• Is there any difference using {} pair or () pair when define function-like macro in C?

  - by solotim

  For example: #define FOO(x) (printf(x)) and #define FOO(x) {printf(x)} It seems that both are viable for preprocessing, but which is better?

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• How to extract a word using regex in php?

  - by Lost_in_code

  How do I extract foo from the following URL and store it in a varialbe, using regex in php? http://example.com/pages/foo/inside.php I googled quite a bit for an answer but most regex examples were too complex for me to understand.

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• empty() doesn't work with codeigniter input class

  - by BabyAzerty

  This is really weird. Whenever I call something like if(empty($this->input->post("foo")){//blabla} The whole PHP is "down" and I get a blank page from the website (even when I don't pass through this empty(input) line). I know this is not the right method and it is stupid, I change the code to if(!$this->input->post("foo")){//blabla} Better I guess ? Seriously, how come the empty(input) breaks down the entire PHP page ? (I can't get any echo "something").

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• PHP define() vs const

  - by clownbaby

  Pretty straightforward question: In PHP, do you prefer to do (and why): define('FOO', 1); OR const FOO = 1; Also, the code is NOT in a class. Thanks.

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