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• How do I define my own operators in the Io programming language?

  - by klep

  I'm trying to define my own operator in Io, and I'm having a hard time. I have an object: MyObject := Object clone do( lst := list() !! := method(n, lst at(n)) ) But when I call it, like this: x := MyObject clone do(lst appendSeq(list(1, 2, 3))) x !! 2 But I get an exception that argument 0 to at must not be nil. How can I fix?

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• set sql server connection to readonly?

  - by acidzombie24

  how do i set a sql server connection to readonly? i tried googling and all i found was File Mode=Read Only but it didnt work (File Mode keyword not supported). And the reference looked sql ce specific. No luck with sqlite Read Only=True either.

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• Using Joins vs Entity associations

  - by shivesh

  I am learning Entity framework and linq-to-entities. It's possible to get cross values from multiple tables using JOINS (join keyword) or using the navigation fields ( associations) in which case the framework knows how to reference the cross data. My question is what to use when?

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• SQL like conditions

  - by garpunkal

  Hi, What does this mean within my like statement? LIKE '%[ .,!?]' + keyword + '[ .,!?]%' I'm trying to get something, that will match for whole words

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• Regular Expression: Match untill pattern is found

  - by ZafarYousafi

  Hi, I want to extract the status from the string untill I found a timespan. My input is something like "Something in start but not with this keyword of sure. STATUS: My Status Is Here Which can be anything but timespan 23:59:01 and so on. I want to extract the string after STATUS: untill 23:59:01 is found. How can i achieve this through regex. this 23:59:01 is a timespan and it is always in this format hh:mm:ss

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• How to differentiate two tables

  - by Nemat

  I have two tables and I want to get all records from one table that are different from the records in second table. Eg.: if we have four records in the first table like A,B,C,D and three records in the second table thats A,B,C then the answer of query should be D. I have tried "EXCEPT" operator but it doesn't work fine. Kindly help me in writing correct query for the given problem.

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• C++ struct sorting

  - by Betamoo

  I have a vector of custom Struct that needs to be sorted on different criteria each time Implementing operator < will allow only one criteria But I want to be able to specify sorting criteria each time I call C++ standard sort. How to do that? Please note it is better to be efficient in running time.. Thanks

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• Will MySQL full-text-search return the results I need?

  - by mike

  I have a keyword field with a list of 5 keywords for each item. example below: 2008, Honda, Accord, Used, Car Will MySQL full text return the item above for the following search requests? 2008 Honda Accord Honda Accord Used Car If so, how well will this hold up when searching through fifty thousand plus records?

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• Hidden features in java [closed]

  - by Ravisha

  Possible Duplicate: Hidden Features of Java Just want to know any hidden/very rarely used features of java which are not so dominant in coding. Like i found the ?? operator in c#

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• How to edit resharper's action list

  - by Gerard

  In Resharper I edited the inspection severity of the 'use var keyword when possible' to ''do not show'. But when I select a certain word in the code file, Resharper still shows a pencil with an Action list in the left border with the action 'use var'. Where can I edit the actions that should be shown? I cannot find this option.

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• Doubt in Conditional inclusion

  - by Philando Gullible

  This is actually extracted from my module (Pre-processor in C) The conditional expression could contain any C operator except for the assignment operators,increment, and decrement operators. I am not sure if I am getting this statement or not since I tried using this and it worked.Also for other manipulation a probable work around would be to simply declare macro or function inside the conditional expression,something like this to be precise. Also I don't understand what is the rationale behind this rule. Could somebody explain? Thanks

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• C++, class as parameter to a method, not template.

  - by ra170

  So, I came across an interesting method signature that I don't quite understand, it went along the lines of: void Initialize(std::vector< std::string > & param1, class SomeClassName * p); what I don't understand is the "class" keyword being used as the parameter, why is it there? Is it necessary to specify or it is purely superficial?

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• Explanation about a Java statement

  - by monn

  public static void main(String[] args) { int x = 1 + + + + + + + + + 2; System.out.println(x); } I can compile above method. Is there any explanation about the allowed multiple "+" operator?

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• Randomly select file in PHP

  - by user201140

  I'd like to use the 'include' keyword in php to randomly select a file from a folder and output the contents. How would I do this? Thanks.

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• how does printf handle its arguments ?

  - by Yassir

  how does printf handle its arguments ? i know that in C# i can use params keyword to do something similar but i can't get it done in C

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• SQL Syntax for testing objects before creating views & functions

  - by Scott Weinstein

  I'm trying to figure out the syntax for creating a view (or function) but only if a dependent CLR assembly exits. I've tried both IF EXISTS (SELECT name FROM sys.assemblies WHERE name = 'MyCLRAssembly') begin create view dbo.MyView as select GETDATE() as C1 end and IF EXISTS (SELECT name FROM sys.assemblies WHERE name = 'MyCLRAssembly') create view dbo.MyView as select GETDATE() as C1 go Neither work. I get Msg 156, Level 15, State 1, Line 2 Incorrect syntax near the keyword 'view'. How can this be done?

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• Creating instance of interface in C#

  - by Max

  I'm working with MS Excel interop in C# and I don't understand how this particular line of code works: var excel = new Microsoft.Office.Interop.Excel.Application(); where Microsoft.Office.Interop.Excel.Application is an INTERFACE defined as: [Guid("000208D5-0000-0000-C000-000000000046")] [CoClass(typeof(ApplicationClass))] public interface Application : _Application, AppEvents_Event { } I'm thinking that some magic happens when the interface is decorated with a CoClass attribute, but still how is it possible that we can create an instance of an interface with a new keyword? Shouldn't it generate a compile time error?

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• What is the difference between is_a and instanceof?

  - by Daniel L

  I am aware that instanceof is an operator and that is_a is a method. Is the method slower in performance? What would you prefer to use?

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• Groovy , what does -> mean

  - by user350325

  In examples of groovy code I find the -> operator everywhere, but the groovy tutorials nor the book I have seem to provide any explaination as to what this means.

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• Can I get a raw pointer from boost's weak_ptr?

  - by Czubaka

  Is it possible to get a raw pointer from boost::weak_ptr? Boost's shared_ptr has get() method and "-" operator. Is there some rationale behind weak_ptr not having the same functionality?

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• Search images using c# in local images folder

  - by np

  We have a images folder which has about a million images in it. We need to write a program which would fetch the image based upon a keyword that is entered by the user. We need to match the file names while searching to find the right image. Looking for any suggestions. Thanks N

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• Using rowDiffs() to calculate difference in values in matrix

  - by user1723765

  I'm using the rowDiffs() command to calculate the step by step difference in 116 rows in a matrix. I get the following error: Error in r[i1] - r[-length(r):-(length(r) - lag + 1L)] : non-numeric argument to binary operator I have no idea why this is happening. I could take the diff() separately for each row and it would work. Any ideas? Here's the data: https://dl.dropbox.com/u/22681355/data.csv Code: a=rowDiffs(data)

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• I want to create an expression for querystrings, this stuff is hard!

  - by jkirkerx

  I want to extract some keywords out of a query string for a search application in asp.net. I decoded the url string first, so it's plain text I have this to start with, but I want to add a keyword group I'd like to trim off the stuff for pure words, but not sure if that's possible I also have a long list of possible query string value fields that I want to check against ?q= @q= ?qs= &qs=

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• JavaScript: Is there any "python's Generator" equivalent in JavaScript?

  - by JackSMTV

  Is there any "python's Generator" equivalent in JavaScript? PS: Python's Generator is very memory efficient when we need to do one time iterate through a big array, hash... "Generators are iterables, but you can only read them once. It's because they do not store all the values in memory, they generate the values on the fly" (Python's Generator explained in this thread: The Python yield keyword explained )

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• how to get all objects of a given type in javascript

  - by FenchKiss Dev

  I want to retrieve all objects (not DOM elements) of a given type created with the "new" keyword. Is it possible ? function foo(name) { this.name = name; } var obj = new foo(); How can I retrieve a reference to all the foo objects ?

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