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  • Make FalseClass behave like TrueClass with meta programming

    - by Edvinas Bartkus
    This is theoretical question: is it possible to change FalseClass behavior to act like TrueClass? It is possible to override to_s, xor, &, | behavior but that is not enough. If you like Test Driven Development, follow my colleague's suggestion: puts "false is new true!" if false puts "never happens" if true Asserts won't work, would it? Is it possible to pass the test successfully?

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  • finding if an anniversary is coming up in n days in MySql

    - by user151841
    I have a table with anniversary dates. I want a query that returns me rows of anniversaries coming up in the next 10 days. For instance: birthdate --------- 1965-10-10 1982-05-25 SELECT birthdate FROM Anniversaries WHERE mystical_magical_mumbo_jumbo <= 10 +------------+ | birthdate | +------------+ | 1982-05-25 | +------------+ 1 row in set (0.01 sec) I'd like to keep the query in the form x <= 10, because I'll use that number 10 in other parts of the query, and if I set it to a variable, I can change it once everywhere by changing the variable, and not have to re-write the query.

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  • C++ return object

    - by Pauff
    I have a class that has a vector of objects. What do I need to do to return one of this objects and change it outside the class, keeping the changings? Is it possible to do with regular pointers? Is there a standard procedure? (And yes, my background is in Java.)

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  • writing into a file in c.

    - by mekasperasky
    i have an char array b[20] which i want to write into a file . After every iteration the value of b[20] changes , so i would like to write the string in each line of the file in each iteration . So how can i change a new line in a file and also put in a array of character?

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  • Rewrite subfolder URL so it appears differently

    - by pg
    I want to change the URL that appears when you go to: MYSUBDOMAIN.MYCOMPANY.COM/carbonated-milk/ to: carbonated-milk.com/ I'm trying to figure out what to put in my .htaccess folder to do this and I've been reading through all kinds of doc files and through other peoples' questions on stackoverflow but can't come up with an answer for this. Do any of you have any idea?

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  • Pattern match and replace in Javascript

    - by T_t
    There is something in my mind: In a web page,there are lots of things we can see from our browser.One of them is text. Now i have some patterns,"abc","hello",or some other strings.In the text, i want to find all the patterns and change the color or background-color of them. Like this: text: what a wonderful day! pattern: "a","day" resulet: what a wonderful day! How can solve this whit Javascript?

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  • Why is one query consistently ~25ms faster than another in postgres?

    - by Emory
    A friend wrote a query with the following condition: AND ( SELECT count(1) FROM users_alerts_status uas WHERE uas.alert_id = context_alert.alert_id AND uas.user_id = 18309 AND uas.status = 'read' ) = 0 Seeing this, I suggested we change it to: AND NOT EXISTS ( SELECT 1 FROM users_alerts_status uas WHERE uas.alert_id = context_alert.alert_id AND uas.user_id = 18309 AND uas.status = 'read' ) But in testing, the first version of the query is consistently between 20 and 30ms faster (we tested after restarting the server). Conceptually, what am I missing?

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  • How does Undo work?

    - by dontWatchMyProfile
    How does undo work? Does it copy all the managed objects every time any of the values change? Or does it only copy the actual changes together with an information which objects were affected? Is that heavy or lightweight?

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  • .Net Regex question!

    - by Tsury
    Supposed I have the following string: string str = "<tag>text</tag>"; And I would like to change 'tag' to 'newTag' so the result would be: "<newTag>text</newTag>" What is the best way to do it? I tried to search for <[/]*tag but then I don't know how to keep the optional [/] in my result...

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  • need a help regarding android 1.5 and 2.1 (beginner)

    - by piemesons
    I am new to android and last year i bought two books of android 1.5. But at that time i was busy in my project so was not able to work on android. Now i want to start android again. Should i go for those books or should i buy new editions Is there any major change regarding basic learnings? Please let me know. Thanks

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  • iPhone: trouble with wrong credentials

    - by user331396
    I am writing an iPhone App that uses a HTTPS/SOAP service which needs user credentials. After I change the password used for these credentials from a valid to an invalid one I still get a valid response from the service, as if the password was never changed. When I restart the app (with the invalid password) the app immediately receives the expected '401' message. Any hints what I might left out to code? Thx :)

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  • Changing the height of an existing, visible TextView

    - by Jim Blackler
    Hi I'd like to programatically increase the height allocated to a TextView, and have the activity layout redrawn accordingly (the text view has a maximum height until the user clicks it, then it takes up all height required, wrap_content). setHeight() isn't working, even coupled with invalidate() or postInvalidate(). I am able to change the contents of the TextBox with setText() but it isn't altering the existing specified height. Android 1.5 under the 1.6 SDK.

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  • SQL Reporting Services 2005 - Date field based on a user entered date?

    - by Pierce
    Hi, I have a report in report services 2005 that has two date fields. The problem is that if users run this for a large section of time it uses too much resources on our server. It is possible to only allow the end user to enter the start date and then the end date be auto populated/derived from this field (for example they enter the 1st of a month and this automatically change the end date to the last of a month.)

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  • sharepoint access

    - by aspguy
    hi, Is there any method available for sharepoint that can do the following: Create an internet site suing wss3.0. login using fba. no need to login to edit documents from library that logged in user has access to. change the password of a user from the site?

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  • How can I scale movement physics functions to frames per second (in a game engine)?

    - by Richard
    I am working on a game in Javascript (HTML5 Canvas). I implemented a simple algorithm that allows an object to follow another object with basic physics mixed in (a force vector to drive the object in the right direction, and the velocity stacks momentum, but is slowed by a constant drag force). At the moment, I set it up as a rectangle following the mouse (x, y) coordinates. Here's the code: // rectangle x, y position var x = 400; // starting x position var y = 250; // starting y position var FPS = 60; // frames per second of the screen // physics variables: var velX = 0; // initial velocity at 0 (not moving) var velY = 0; // not moving var drag = 0.92; // drag force reduces velocity by 8% per frame var force = 0.35; // overall force applied to move the rectangle var angle = 0; // angle in which to move // called every frame (at 60 frames per second): function update(){ // calculate distance between mouse and rectangle var dx = mouseX - x; var dy = mouseY - y; // calculate angle between mouse and rectangle var angle = Math.atan(dy/dx); if(dx < 0) angle += Math.PI; else if(dy < 0) angle += 2*Math.PI; // calculate the force (on or off, depending on user input) var curForce; if(keys[32]) // SPACE bar curForce = force; // if pressed, use 0.35 as force else curForce = 0; // otherwise, force is 0 // increment velocty by the force, and scaled by drag for x and y velX += curForce * Math.cos(angle); velX *= drag; velY += curForce * Math.sin(angle); velY *= drag; // update x and y by their velocities x += velX; y += velY; And that works fine at 60 frames per second. Now, the tricky part: my question is, if I change this to a different framerate (say, 30 FPS), how can I modify the force and drag values to keep the movement constant? That is, right now my rectangle (whose position is dictated by the x and y variables) moves at a maximum speed of about 4 pixels per second, and accelerates to its max speed in about 1 second. BUT, if I change the framerate, it moves slower (e.g. 30 FPS accelerates to only 2 pixels per frame). So, how can I create an equation that takes FPS (frames per second) as input, and spits out correct "drag" and "force" values that will behave the same way in real time? I know it's a heavy question, but perhaps somebody with game design experience, or knowledge of programming physics can help. Thank you for your efforts. jsFiddle: http://jsfiddle.net/BadDB

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  • javascript htmlDivElement problem

    - by Fearghal
    Hi guys, I have a htmlDivElement (with no id) - and I'm trying to access and change the style of it.. Problem is everything I try returns 'Undefined' when i try to alert it Eg: alert (htmldivelementobject.className) I've also tried getAttribute but it returns the same thing... Where am I going wrong? F

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