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• Warning produced by f#: value has been copied to ensure the original is not mutated

  - by user1878761

  The first definition below produces the warning in the title when compiled with f# 3.0 and the warning level set to 5. The second definition compiles cleanly. I wondered if someone could please explain just what the compiler worries I might accidentally mutate, or how would splitting the expression with a let clause help avoid that. Many thanks. let ticks_with_warning () : int64 = System.DateTime.Now.Ticks let ticks_clean () : int64 = let t = System.DateTime.Now t.Ticks

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• What doesn't MySQL do? [closed]

  - by sean riley

  When using MySQL 5.1 Enterprise after years of using other database products like Sybase, Infomix, DB2; I run into things that MySQL just doesn't do. For example, it can only generate an EXPLAIN query plan for SELECT queries. What are the other things I should watch out for?

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• How do I select a random record efficiently in MySQL?

  - by user198729

  mysql> EXPLAIN SELECT * FROM urls ORDER BY RAND() LIMIT 1; +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | id | select_type | table | type | possible_keys | key | key_len | ref | rows | Extra | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ | 1 | SIMPLE | urls | ALL | NULL | NULL | NULL | NULL | 62228 | Using temporary; Using filesort | +----+-------------+-------+------+---------------+------+---------+------+-------+---------------------------------+ The above doesn't qualify as efficient,how should I do it properly?

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• Hi, I would like to know if anyone knows where to get some exercises of to practise

  - by Adomas

  I think small exercises would be the baest way for me to learn programming. I am the begginer and I am willing to give plenty of time to this. To explain, to my opinion exercises should be something to write not long programs (10-30lines), to say what the program will print or that is the mistake. Who can help me and say where to maybe a website with such stuff? Thanks

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• What software should i use to work with Ruby?

  - by paranoid_pedlar

  I've only ever learned to "program" with notepad when I was learning to create batch files in Windows. I would appreciate if you can explain to me the benefits of working with an IDE over a text editor or vice versa. Please don't give emotional responses or argue someone else's suggestion/advice. I use Linux primarily. Also, I would like to be able to make programs that can be used in Windows, but programmed in Linux. Thanks.

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• How to handle form data in cakephp

  - by Vinay

  i have a form for adding people object ,i want to add as many people without saving people in database,after clicking add people form submit button,the same form should appear without saving the form data to database,instead it should save to the session.please explain in detail if possible with the help of a example to do this, i have not found any tutorial which explains cakephp session in detail.

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• AnnotationSessionFactoryBean and singleton scoped bean (Spring framework)

  - by EugeneP

  I define a bean of type AnnotationSessionFactoryBean for using in a web-app. If I do not explicitly define it as NOT singleton, it must be singleton. Now, it is bound to the current thread. It means it cannot be a singleton. Can you explain this puzzle?

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• Where are Silverlight assemblies stored when a xap file is run?

  - by ForeverDebugging

  We currently have a XAP file which contains Foo.dll, and another XAP file (with a completely different name) which contains an updated version Foo.dll (but the same version number). When we run the second XAP file, it looks as though the Silverlight runtime on the client, is picking up the old version of Foo.dll from the first XAP file. Anyone know where the Silverlight runtime unzips the xap file before running its content? Or if the runtime executes on a single app domain which could explain these errors?

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• What is the use of mysql_rollback() function in PHP?

  - by OM The Eternity

  What is the use of mysql_rollback() function in PHP? How is it used? please explain me with some example, PS: Please Do not give me link to the php.net or, mysql site, I dont need AUTHOR language to understand it, I need the Developer way to understand... I hope u understand... Thanks in advance. UPDATE if i have Updated something in a tanle can i Reset the previous value using this function?

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• Why does this throw NullPointerException?

  - by Parhs

  e.getCategory() != null ? e.getCategory().getName() : ""; This throws a NullPointerException and I do not understand why. Can anyone explain?

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• Understanding a #define directive

  - by Meta

  Looking at the Windows SDK, I found this #define directive for MAKEINTRESOURCEW: #define MAKEINTRESOURCEW(i) ((LPWSTR)((ULONG_PTR)((WORD)(i)))) Can someone explain to me what the heck that means? For example, what would be the value of MAKEINTRESOURCEW(0)? (1)? (-1)?

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• Want to understand authorization,cookies,users logins,sessions...

  - by henderunal

  Hello, I want to understand the logic of authorization,cookies,users logins,sessions..Do you know any source that explain and teach me about it. If it could give any examples it would be great. I mostly use php,jsp but it would be no problem if you give answer related other languages.

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• exeuting command in background

  - by tazim

  Hi, Trying to execute shell command in background using pythons commands module >>>import commands >>>output = commands.getstatusoutput("find / > tmp.txt &") sh: Syntax error: ";" unexpected Can anyone explain what is wrong with the syntax ? How should it be executed then ? Tazim.

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• How to call a method in init method ?

  - by srikanth rongali

  My program looks like this: -(id)init { if ( (self = [super init]) ) { //TargetWithActions *targetActions= [[TargetWithActions alloc] init]; [self countDownSpeed123]; } return self; } -(void)countDownSpeed123 { countDownSpeed = 5.0f; } @end warning: 'TargetWithActions' may not respond to '-countDownSpeed123' I am getting the warning in this way. Where I am wrong in my program. Please explain ? Thank You.

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• C# ASP.Net WebForm Membership Extra User Details (Profile)

  - by user1638362

  I'm learning how to use the ASP.net membership, when a user registers they just create a username and password, however i want to create a page on my website called "profile" where they can fill in extra details such as firstname, lastname, date of birth ect. However i don't see where i can place this in the asp.net membership database. Theres an asp.net_profile table however i'm not sure how this works. Could someone please explain how i can do this?

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• Object Events, how do are they implemented

  - by Malfist

  Events are really awesome, and I wouldn't know what I would do without them, but they're a mystery to me. I'm talking about events in a sense, a function(s) is called if a property, or value, a special event happens. I have only the vaguest idea how these actually work. I know it's an observer pattern, but I don't truly know how it works and/or how to implement it. Can someone explain that to me?

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• __proto__ of a function

  - by alter

  if I have a class called Person. var Person = function(fname, lname){ this.fname = fname; this.lname = lname; } Person.prototype.mname = "Test"; var p = new Person('Alice','Bob'); Now, p.proto refers to prototype of Person but, when I try to do Person.proto , it points to function(), and Person.constructor points to Function(). can some1 explain what is the difference between function() and Function() and why prototype of a Function() class is a function()

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• Why does enabling 32-bit applications on IIS7 break classic ASP on .html files?

  - by rg89

  When I enable 32 bit applications on the application pool of a website running on Server 2008 web IIS7, a handler mapping for *.html - asp.dll no longer works. Can anyone explain why?

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• What is the correct way to create a single instance application?

  - by Nidonocu

  Using C# and WPF under .net (rather than WindowsForms or console), what is the correct way to create an application that can only be run as a single instance? I know it has something to do with some mythical thing called a mutex, rarely can I find someone that bothers to stop and explain what one of these are. The code needs to also inform the already running instance that the user tried to start a second one, and maybe also pass any command line arguments if any existed.

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• How to creating code highlighted blocks on your website

  - by Saif Bechan

  I have written a small PHP framework and I want to make a website where I explain some basic features. I want to display blocks of php code. Is there an easy to do this, preferably without JavaScript. I want to have section kind of like displayed below: // This function takes in a value and return it public function getname($name){ return $name; }

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• What is the ASP ViewState?

  - by KevinDeus

  I'm looking for an easy way to explain this to someone. Apologies if it has been asked before.

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• why does my javascript regex.test() give alternating results

  - by Dennis George

  var r = /\d/g; var a = r.test("1"); // will be true var b = r.test("1"); // will be false console.log(a == b); // will be false Please explain to me why the result of r.test("1") alternates with each call? I was able to work around the issue I was having by removing the g modifier. However I would still like to understand why this happens.

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• Why does this compile?

  - by akf

  I was taken aback earlier today when debugging some code to find that something like the following does not throw a compile-time exception: public Test () { HashMap map = (HashMap) getList(); } private List getList(){ return new ArrayList(); } As you can imagine, a ClassCastException is thrown at runtime, but can someone explain why the casting of a List to a HashMap is considered legal at compile time?

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• __rlshift__, __ror__ in Python

  - by Casebash

  I noticed that this recipe seems to use __rlshift__, __ror__ like operators. But, they aren't in the documentation! Can anyone explain these and perhaps point to some docs?

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• commands executing in piping in UNIX

  - by Happy Mittal

  when I write a command $ echo date then it prints "date" as it is i.e it doesn't run date program. But when I write $ echo date | wc then correct answer is produced as if date was run. How piping is making difference here ? Please explain.

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