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• What do parentheses in a Perl regex do?

  - by iamrohitbanga

  I have been trying several regular expressions in the substitution operator: $str =~ s/^0+(.)/$1/; converts 0000 to 0 and 0001 to 1 $str =~ s/^0+./$1/; converts 0000 to empty string, 000100 to 00, 0001100 to 100. what difference is the parentheses making?

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• What all does a compiler add to an empty class declaration?

  - by cambr

  Suppose, I write class A { }; compiler should provide (as and when needed) a constructor a destructor a copy constructor = operator Is this all what the compiler provides? Are there any additions or deletions to this list?

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• Read from cin or a file

  - by m42a

  When I try to compile the code istream in; if (argc==1) in=cin; else { ifstream ifn(argv[1]); in=ifn; } gcc fails, complaining that operator= is private. Is there any way to set an istream to different values based on a condition?

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• In MSAcess Database, Insert query to insert the character with apostrophe

  - by Suryakavitha

  In MSAcess Database Insert query to insert the character------ N'tetarnyl i have a insert query OleDbCommand cmd = new OleDbCommand("insert into checking values('" + dsGetData.Tables[0].Rows[i][0].ToString() + "','" + dsGetData.Tables[0].Rows[i][1].ToString()+ "')", con); but it is showing me error... syntax error (missing operator) in query expression any idea??? how to write insert query to insert the N'tetarnyl (including apostrophe)

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• What is this conversion called?

  - by LoudNPossiblyRight

  Is there a name or a term for this type of conversion in the c++ community? Has anyone seen this conversion be referred to as "implicit conversion"? class ALPHA{}; class BETA{ public: operator ALPHA(){return alpha;} private: ALPHA alpha; }; void func(ALPHA alpha){} int main(){ BETA beta; func(beta); return 0; }

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• Problem with computed column with NDBUnit

  - by jess

  Hi, I am loading data for tests in tables using xml and ndbunit.But,for a table having computed column,I am having problem.I get this error The column "xyz" cannot be modified because it is either a computed column or is the result of a UNION operator. I have modified the INSERT and UPDATE commands(removed the computed column) of sqladapter in xsd file,but still face the issue. thanks

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• Accessing a namespace containing .base in its name from F#

  - by emaster70

  As the title says, I'm trying to use a class declared in a namespace which contains "base" in its name. Think of a situation like the following: open Foo.base.Bar In C# I'd just use @ before base but F# seems to ignore that and to think that @ is the infix operator used for list concatenation. Since the namespace belongs to a third-party library which I cannot modify, is there a way I can still access it from F#?

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• How can I perform an idiomatic non-recursive flatten in ruby?

  - by nasmorn

  I have a method that returns an array of arrays. For convenience I use collect on a collection to gather them together. arr = collection.collect {|item| item.get_array_of_arrays} Now I would like to have a single array that contains all the arrays. Of course I can loop over the array and use the + operator to do that. newarr = [] arr.each {|item| newarr += item} But this is kind of ugly, is there a better way?

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• Math operation in Java

  - by joroj

  Hello, what "^" operator does? when I try this: int a = 5^n; it gives me: for n = 5, returns 0 for n = 4, returns 1 for n = 6, returns 3 What is this?

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• How do you make cin typesafe?

  - by cactusbin

  It is well known that cin is not typesafe (e.g. cin integer; and entering "fifty five" will cause it to flip out). I have seen many not-so-elegant ways to hand this, such as getlining a string and using sstream to convert it to a number, or looping with cin.fail() and clearing the stream and reentering it, etc. Is there any library or anyway to overload the inserter operator to make cin automatically typesafe?

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• LINQ Single vs First

  - by BahaiResearch.com

  LINQ: Is it more efficient to use the Single() operator over First() when ever I know for certain that the query will return a single record? Is there a difference?

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• Filter tweets by client name

  - by Ido Shilon

  I'm trying to filter tweets results by client name like - using source operator. I'm trying to do it with a a client named "single platform" , to get tweets like http://twitter.com/#!/phoenixparknyc/status/43340419475570688 but the search doesn't seems to work (tried with quotes as well) http://twitter.com/#!/search/source%3Asingle%20platform%20Specials%2FEvents%20 Any idea how to make the search works ?

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• Is there a way to combine IN and LIKE in MySQL?

  - by abeger

  I'm currently running a query like this: SELECT * FROM email WHERE email_address LIKE 'ajones@%' OR email_address LIKE 'bsmith@%' OR email_address LIKE 'cjohnson@%' The large number of OR's bothers me. Is there a way to condense this up with something akin to an IN operator, e.g.: SELECT * FROM email WHERE email_address LIKE ('ajones@%', 'bsmith@%', 'cjohnson@%') Or is this just wishful thinking?

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• How to implement == or >= operators for generic type

  - by momsd

  I have a generic type Foo which has a internal generic class Boo. Boo class a property Value of type K. In a method inside Foo i want to do a boo.Value >= value Note that second operand value is of type T. while compiling i am getting following error: Operator '=' cannot be applied to operands of type 'T' and 'T' Can anyone please tell me whats the problem here?

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• extract/slice/reorder lists in (emacs) lisp?

  - by Stephen

  In python, you might do something like i = (0, 3, 2) x = [x+1 for x in range(0,5)] operator.itemgetter(*i)(x) to get (1, 4, 3). In (emacs) lisp, I wrote this function called extract which does something similar, (defun extract (elems seq) (mapcar (lambda (x) (nth x seq)) elems)) (extract '(0 3 2) (number-sequence 1 5)) but I feel like there should be something built in? All I know is first, last, rest, nth, car, cdr... What's the way to go? ~ Thanks in advance ~

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• K/APL style programming in C++?

  - by anon

  I'm writing code in C++, but I really like K/APL's array-oriented style. Does anyone know of a good set of operator overloading tricks / macros / ... to allow some K/APL -style programming in C++? Thanks!

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• Getting value depedning on two boolean attrinutes.[Nested ifs]

  - by uswaretech

  I have two fields start_time end_time - can be null Now, depending on this I needs to differentiate between three states Scheduled in future, Currently running Completed in past Since mysql IF operator can not be nested, (Or I cant find an easy way to nest them), I cant find how to get the three state status.

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• What is the best way to open a URL and get up to X bytes in Python?

  - by Stavros Korokithakis

  I want to have a robot fetch a URL every hour, but if the site's operator is malicious he could have his server send me a 1 GB file. Is there a good way to limit downloading to, say, 100 KB and stop after that limit? I can imagine writing my own connection handler from scratch, but I'd like to use urllib2 if at all possible, just specifying the limit somehow. Thanks!

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• Size of abstract class

  - by webgenius

  How can I find the size of an abstract class? class A { virtual void PureVirtualFunction() = 0; }; Since this is an abstract class, I can't create objects of this class. How will I be able to find the size of the abstract class A using the 'sizeof' operator?

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• How to process this string via regular expression

  - by iiduce

  my string style like this: expression1/field1+expression2*expression3+expression4/field2*expression5*expression6/field3 a real style mybe like this: computer/(100)+web*mail+explorer/(200)*bbs*solution/(300) "+" and "*" represent operator "computer","web"...represent expression (100),(200) represent field num . field num may not exist. I want process the string to this: /(100)+web*+explorer/(200)bbs/(300) rules like this: if expression length is more than 3 and its field is not (200), then add brackets to it.

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• LINQ expression until to break a string

  - by wonea

  Using LINQ I'm looking to break down the following path string[], however I'd like to break it up to the point of the Binn folder. Is there a WHERE UNTIL operator in LINQ? c:\ Program Files\ Microsoft SQL Server\ MSSQL10.SQLEXPRESS\ MSSQL\ Binn\ sqlservr.exe What I'd like todo var words = from word in thepath where UNTIL thepath == "Binn" select word;

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• What are the most interesting/useful new things in Perl 5.12?

  - by hillu

  I remember quickly adopting given .. when, say, //, and the smart matching operator when Perl 5.10 came around. What do you consider the most useful fixes and features introduced with Perl 5.12.0?

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• Which is clearer form: if(!value) or if(flag == value) ?

  - by CodexArcanum

  I understand this is a subjective question, so I apologize if it needs to be closed, but I feel like it comes up often enough for me to wonder if there is a general preference for one form over the other. Obviously, the best answer is "refactor the code so you don't need to test for falsehood" but sometimes there's no easy way to do so and the "else" branch is simply to continue processing. So when you must have an "if not false" construct, which is the preferred standard: The not operator if(!value) Or the test for false if(value == false)

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• problem with intersect operation in a sql query

  - by Shadi

  I wrote the following query, I think it's correct but I have a "missing operator" error. SELECT * FROM results,Types WHERE results.a=Types.b INTERSECT SELECT * FROM results,Types WHERE results.c=Types.b Could somebody help me please? Thanks a lot.

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• [game] How to write ::: in cpp and ??? in c#?

  - by daveny

  These questions are a kind of game, and I did not find the solution for them. It is possible to write ::: in Cpp without using "" or anything like this and the compiler will accept it. (macro-s are prohibited too) And the same is true for C# too, but in C#, you have to write ???. I think Cpp will use the :: scope operator and C# will use '? :' , but I do not know the answers to them. Any idea?

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