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• Calling assignment operator in copy constructor

  - by stas

  Are there some drawbacks of such implementation of copy-constructor? Foo::Foo(const Foo& i_foo) { *this = i_foo; } As I remember, it was recommend in some book to call copy constructor from assignment operator and use well-known swap trick, but I don't remember, why...

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• Greatest of Two Numbers Without Using A Relational Operator

  - by ratty

  I want to find the greater of two numbers without using < > this relational operator. I tried this int a,b; if(a/b==0) { b is greater } else { a is greater } but this not working for negative numbers.

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• string patterns to PCRE conversion code

  - by ammasajan

  Hi all, I would like to know, is there a conversion library for converting string patterns to PCRE regular Expression patterns. Sample Patterns: application/ms-tnef ARKADMIN_GET_ 34 ^MAIL FROM|3a| ? 2| Thanks in advance.

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• App Engine datastore does not support operator OR

  - by JohnIdol

  I am trying to query the google datastore for something like (with pm -- persistanceManager): String filters = "( field == 'value' || field == 'anotherValue' )"; Query query = pm.newQuery(myType.class, filters); When I execute - I am getting back: App Engine datastore does not support operator OR. What's the best approach in people experience for this kind of queries? Any help appreciated!

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• Another warning question: "Incompatible intiger to pointer conversion assigning to 'int *' from 'int'"

  - by Preston

  I have yet another pesky warning I would like gone. Basically, I have an int declared like this: @property (nonatomic, assign) int *myInt; and set like this: myInt = 0;. It is also synthesized in the implementation file. I am getting a warning on the line where I set the int's value and it says "Incompatible intiger to pointer conversion assigning to 'int *' from 'int'." What should I do to fix this?

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• <:< operator in scala.

  - by scout

  Can anybody provide some details on <:< operator in scala. I think if(apple <:< fruit) //checks if apple is a subclass of fruit. Are there any other explanations? I see many definitions in the scala source file.

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• How does the bitwise operator '^' work?

  - by SpawnCxy

  I'm a little confused when I see the output of following code: $x = "a"; $y = "b"; $x ^= $y; $y ^= $x; $x ^= $y; echo $x; //got b echo $y; //got a And I wonder how does the operator ^ work here?Explanations with clarity would be greatly appreciated!

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• blank to numeric conversion derived column

  - by praveen

  Hi All, I have a source column with blank (not "NULL"), and target as numeric. while converting using the data conversion it is not converting due to balnk source value so I used derived column to replace a blank value with NULL or 0 as (source column == " ") ? "0" : source column but its not giving the value as 0 in the blank place. thanks prav

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• Scala @ operator

  - by lowercase

  What does scala @ operator do? For example at this page there is a something like this case x @ Some(Nil) => x

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• biggest of two nos without using relational operator

  - by ratty

  i like to find the greatest of two nos without using < this relational operator. i tired this int a,b; if(a/b==0) { b is greater } else { a is greater } but this not working for negative nos .please help for this

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• using 'new' operator

  - by notLikeCpp

  I have simple task concerning 'new' operator. I need to create array of 10 chars and then input those chars using 'cin'. Should it look like this ? : char c = new char[10]; for(int i=0; i < 10; i++) { cin >> char[i] >> endl; }

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• What does the ^ operator do in Java?

  - by joroj

  What function does the "^" operator serve in Java? 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 ...so I guess it doesn't indicate exponentiation. But what is it then?

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• Number conversion in Javascript

  - by Vafello

  I have a question concerning number conversion i JS. I have a number like 1613841.93424 (meters) and I would like it to convert to 1.6 km instead. What JS function should I use for that? Thanks.

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• C# analog for sql in operator

  - by er-v

  There is in operator in SQL SELECT * FROM MyTable WHERE id IN (1, 2, 3, 4, 5) Is there similar sintax in C#, I mean if(variable in (1, 2, 3, 4, 5)){ }

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• type conversion

  - by gcc

  why i couldnot make type conversion char *p; int l=65; these two didnot work ...why??? (int *)p=&l; or p=&((char) l);

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• Datatype Conversion

  - by user87

  I am trying to execute the following Query select distinct pincode as Pincode,CAST(Date_val as DATE) as Date, SUM(cast(megh_38 as int)) as 'Postage Realized in Cash', SUM(cast(megh_39 as int)) as 'MO Commission', from dbo.arrow_dtp_upg group by pincode,Date_Val but I am getting an error "Conversion failed when converting the nvarchar value '82.25' to data type int." Am I using a wrong data type?

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• when to use === operator check in JavaScript?

  - by ptrn

  As the title states; when should you use the === operator check when using JavaScript, and when not to. _L

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• Which namespace does operator<< (stream) go to?

  - by aaa

  If I have have some overloaded ostream operators, defined for library local objects, is its okay for them to go to std namespace? If I do not declare them in std namespace, then I must use using ns:: operator <<. As a possible follow-up question, are there any operators which should go to standard or global namespace?

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• Versant OQL Statement with an Arithmetic operator

  - by Pascal

  I'm working on a c# project that use a Versant Object Database back end and I'm trying to build a query that contains an arithmetic operator. The documentation states that it is supported but lack any example. I'm trying to build something like this: SELECT * FROM _orderItemObject WHERE _qtyOrdered - _qtySent > 0 If I try this statement in the Object Inspector I get a synthax error near the '-'. Anyone has an example of a working VQL with that kind of statement? Thanks

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• Change log4net conversion pattern or layout at runtime

  - by adam0101

  I'm using the LogInfo() method to log to a rolling flat file, but I need to change the conversion pattern or pattern layout (whatever you want to call it) temporarily when calling it in a certain circumstance. Is this possible?

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• Does Cocoa’s printf-style formatting not work as expected when using %@ conversion specifier and fie

  - by Nikolai Ruhe

  My understanding of printf-like format strings is that you can prefix any conversion specifier with a minimum field width. This does not seem to work for Cocoa’s %@ specifier. Example: NSLog(@"'%5@'", @"foo"); NSLog(@"'%5s'", [@"foo" UTF8String]); Output: … 'foo' … ' foo' Is this the intended behavior?

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• Google analytics compare mutiple sites conversion rate

  - by Jackson

  Hi Team, I would like to compare conversion funnels from multiple sites. Is there a straight forward way of doing this in google analytics? Thanks, Jackson

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• C++ delete[] operator

  - by Betamoo

  Is this the right way to use delete[] operator? int* a=new int[size]; delete[] a; If yes, Who (compiler or GC or whoever) will determine the size of the newly created array? and where will it store the array size? Thanks

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• C++ typeof operator

  - by aaa

  hi, very short question. Is C++ typeof operator standard? de facto standard? which compilers do not provided it (besides Microsoft C++)?

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• How do I use Perl's chdir operator?

  - by T. Gruhn

  In ksh, I'd use cd /usr/src/sys How should I write it in Perl? A conversion such as cd /usr/src/sys ---> chdir '/usr/src/sys' Maybe the following would be better: execute "chdir '/usr/src/sys' "

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