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• Is there any standard delete functor?

  - by FredOverflow

  I am looking for a functor that deletes its argument: template<class T> struct delete_functor { void operator()(T* p) { delete p; } }; Is there something like this in std, tr1 or boost?

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• Problem with receiving data form serial port in c#?

  - by moon

  hello i have problem with receiving data from serial port in c# in am inserting a new line operator at the end of data buffer. then i send this data buffer on serial port, after this my c# GUI receiver will take this data via Readline() function but it always give me raw data not the actual one how to resolve this problem.

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• c#: xdocument and reading xsi:nil="true" gives "String was not recognized as a valid DateTime"

  - by DingoCC

  Happily reading xml with var q2 = from c in xmlDoc.Descendants("Ticket") select new { Responded_Date = (DateTime)c.Element("Responded_Date") } However when the tag is <Responded_Date xsi:nil="true" /> I get "String was not recognized as a valid DateTime". I don't wish to use the null coalescing operator but simply to take the null and insert into datatable

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• In C#, how do I check if a type is a subtype OR the type of an object?

  - by Daniel T.

  To check if a type is a subclass of another type in C#, it's easy: typeof (SubClass).IsSubclassOf(BaseClass); // returns true However, this will fail: typeof (BaseClass).IsSubclassOf(BaseClass); // returns false Is there any way to check whether a type is either a subclass OR of the base class itself, without using an OR operator or using an extension method?

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• Help with SQL query in C#

  - by DanSogaard

  I'm trying to rename the columns. The syntax should be the column name between double quotes incase of two words, like this: SELECT p_Name "Product Name" from items So I'm trying to do it in C# code like this: string sqlqry1 = "SELECT p_Name \"Prodcut Name\" from items"; But I get an error: Syntax error (missing operator) in query expression 'p_Name "Prodcut Name"'. It seems am having somthing wrong with the quotes, but I can't figure out.

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• Does casting an IList<T> to an array of type T[] cause enumeration?

  - by Brian Triplett

  I have a method that looks like: T[] field; public Method(IList<T> argument) { this.field = (T[])argument; } When the body of the method is executed does enumeration take place during the cast? Would that change if the underlying type was different?

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• How to map LINQ EntitySet to List property in property setter?

  - by jlp

  In my model I have these entities: public interface IOrder { string Name {get;set;} List<IProduct> OrderedProducts {get;set;} } public interface IProduct {} In partial class generated by linq-to-sql I map these properties on my entity properties: public partial class Order : IOrder { List<IProduct> OrderedProducts { get { return this.L2SQLProducts.Cast<IProduct>.ToList(); } set { this.L2SQLProducts = ??? } } } How should setter look like?

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• inserting only date in a column in sql server

  - by sam

  hi! Is there a way to insert only date in a datetime column in sql server without the time? for example date (datetime) =============== 12-01-2000 16-02-2000 or i should store this as a varchar and cast it when retriving so that i can convert to whatever form i need.

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• What does =*> mean with regards to context free grammars?

  - by incrediman

  I've been reading a couple books/online references about compiler theory, and keep seeing that particular operator coming up every once in a while (as seen here), specifically when the current topic is context free grammars. What does it mean? As well, how does it differ from =>? Explanations with examples distinguishing => from =*> would be most helpful.

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• list of pointers in c++

  - by pavlos

  What i want to do is for (list<cPacket *>::iterator i = cache.begin(); i != cache.end(); i++){ if( strcmp(i->getName(),id) == 0 ){ return true; } } where getName is function of the class cPacket, But it does not work, i tries also i.operator->()->getName(), and again nothing. Can anybody help me?

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• Float conditional in bash

  - by Werner

  Hi, in bash I need to compare two float numbers, one which I define in the script and the other read as paramter, for that I do: if [[ $aff -gt 0 ]] then a=b echo "xxx "$aff #echo $CX $CY $CZ $aff fi but I get the error: [[: -309.585300: syntax error: invalid arithmetic operator (error token is ".585300") What is wrong? Thanks

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• Char and Chr in Delphi

  - by JamesB

  The difference between Chr and Char when used in converting types is that one is a function and the other is cast So: Char(66) = Chr(66) I don't think there is any performance difference (at least I've never noticed any, one probably calls the other).... I'm fairly sure someone will correct me on this! Which do you use in your code and why?

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• Error Message 'class::function' : illegal call of non-static member function

  - by shak

  i was trying to call a static function of class using scope resolution operator, the way to access static function but still generating error. what are the possibilities.

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• ArrayList and Map problem in grails

  - by xain

  Hi, I have a service that contains a map: static Map cargosMap = ['1':'item1','2':'item 2','3':'item 3'] that is returned via a method in the service: static Map getCargos() { [cargosMap] } A controller calls it like this: def mform = { Map cargos = empService.getCargos() [cargos:cargos] } In the gsp, I have the select: <g:select name="cg1" from="${cargos}" /> But I'm getting the exception: Error 500: Executing action ....caused exception: org.codehaus.groovy.runtime.typehandling.GroovyCastException: Cannot cast object ... with class 'java.util.ArrayList' to class 'java.util.Map' Any clues ? Thanks

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• C++: ptr->hello(); /* VERSUS */ (*ptr).hello();

  - by Joey

  i was learning about c++ pointers... so the "-" operator seemed strange to me... instead of ptr-hello(); one could write (*ptr).hello(); because it also seems to work, so i thought the former is just a more convenient way is that the case or is there any difference?

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• How can it be that PageContent implements IAddChild but has none of this interface methods?

  - by Nimrod Shory

  The PageContent element implements IAddChild but doesn't implements IAddChild methods so I can't call AddChild method on PageContent.. How can it be? And if i cast PageContent to IAddChild i can call AddChild method on it - So it does implement it somewhere... I am confused with this behavior. Can someone shed some light on this?

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• Difference between DirectCast() and CType() in VB.Net

  - by Chapso

  I am an experienced C/C++/C# programmer who has just gotten into VB.NET. I generally use CType (and CInt, CBool, CStr) for casts because it is less characters and was the first way of casting which I was exposed to, but I am aware of DirectCast and TryCast as well. Simply, are there any differences (effect of cast, performance, etc.) between DirectCast and CType? I understand the idea of TryCast.

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• Why is not advisable to use goto frequently? [closed]

  - by Babiker

  Possible Duplicate: GOTO still considered harmful? I have read articles that advise on refraining from using the goto operator frequently, but never told why. I have googled this for ever and can't really find anything.

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• LESS THAN OR EQUAL TO IN Oracle SQL

  - by Jasim

  updated_date = 08-Jun-2010; I have a query like this select * from asd whre updated_date <= todate('08-Jun-2010', 'dd-MM-yy'); but i am not getting any result. it is wotking only if todate is 09-Jun-2010... ie my equalto operator is not working properly. y is it like that ny help?

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• python: equivalent to Javascript "||" to override non-truthful value

  - by Jason S

  In Javascript I can do this: function A(x) { return x || 3; } This returns 3 if x is a "non-truthful" value like 0, null, false, and it returns x otherwise. This is useful for empty arguments, e.g. I can do A() and it will evaluate as 3. Does Python have an equivalent? I guess I could make one out of the ternary operator a if b else c but was wondering what people use for this.

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• Why would you avoid C++ keywords in Java?

  - by Joshua Swink

  A popular editor uses highlighting to help programmers avoid using C++ keywords in Java. The following words are displayed using the same colors as a syntax error: auto delete extern friend inline redeclared register signed sizeof struct template typedef union unsigned operator Why would this be considered important?

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• How does the CLR know the type of a boxed object?

  - by fearofawhackplanet

  When a value type is boxed, it is placed inside an untyped reference object. So what causes the invalid cast exception here? long l = 1; object obj = (object)l; double d = (double)obj;

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• VBA: Validate List settings

  - by stanigator

  Sub Macro1() ' ' Macro1 Macro ' ' Worksheets("Drop-down").Select For i = 1 To 10 ActiveSheet.Cells(i, 2).Select With Selection.Validation .Delete ' Error in this line .Add Type:=xlValidateList, AlertStyle:=xlValidAlertStop, Operator:= _ xlBetween, Formula1:=Range(Worksheets("Misc").Cells(2, i), Worksheets("Misc").Cells(2, i).End) .IgnoreBlank = True .InCellDropdown = True .InputTitle = "" .ErrorTitle = "" .InputMessage = "" .ErrorMessage = "" .ShowInput = True .ShowError = True End With Next i End Sub I'm getting an error in the line below the comment, yet I don't know how to fix it. It would be great to hear some suggestions. Thanks in advance!

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• What does [a|b|c] evaluate to in Prolog?

  - by Ambrose

  The pipe operator in prolog returns one or more atomic Heads and a Tail list. ?- [a,b,c] = [a,b|[c]]. true. Nesting multiple pipes in a single match can be done similar to this: ?- [a,b,c] = [a|[b|[c]]]. true. What does the statement [a|b|c] infer about a, b and c?

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• Problem getting size of Website Xcode

  - by Michael Amici

  When i try and compile I come up with a warning that reads initialization makes pointer from integer without a cast. No clue why. I am just trying to get the size of a website. #import "Lockerz_RedemptionViewController.h" @implementation Lockerz_RedemptionViewController -(IBAction)startLoop:(id) sender { NSData *dataNew = [NSData dataWithData:[NSData dataWithContentsOfURL:[NSURL URLWithString:@"http://www.google.com/"]]]; NSUInteger *len = [dataNew length]; //error is here NSLog(@"%@", len); }

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