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  • How to return a 'read-only' copy of a vector

    - by michael
    Hi, I have a class which has a private attribute vector rectVec; class A { private: vector<Rect> rectVec; }; My question is how can I return a 'read-only' copy of my Vector? I am thinking of doing this: class A { public: const vect<Rect>& getRectVec() { return rectVect; } } Is that the right way? I am thinking this can guard against the callee modify the vector(add/delete Rect in vector), what about the Rect inside the vector?

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  • Python NameError when attempting to use a user-defined class

    - by Michael Herold
    I'm getting a weird instance of a NameError when attempting to use a class I wrote. In a directory, I have the following file structure: dir/ ReutersParser.py test.py reut-xxx.sgm Where my custom class is defined in ReutersParser.py and I have a test script defined in test.py. The ReutersParser looks something like this: from sgmllib import SGMLParser class ReutersParser(SGMLParser): def __init__(self, verbose=0): SGMLParser.__init__(self, verbose) ... rest of parser if __name__ == '__main__': f = open('reut2-short.sgm') s = f.read() p = ReutersParser() p.parse(s) It's a parser to deal with SGML files of Reuters articles. The test works perfectly. Anyway, I'm going to use it in test.py, which looks like this: from ReutersParser import ReutersParser def main(): parser = ReutersParser() if __name__ == '__main__': main() When it gets to that parser line, I'm getting this error: Traceback (most recent call last): File "D:\Projects\Reuters\test.py", line 34, in <module> main() File "D:\Projects\Reuters\test.py", line 19, in main parser = ReutersParser() File "D:\Projects\Reuters\ReutersParser.py", line 38, in __init__ SGMLParser.__init__(self, verbose) NameError: global name 'sgmllib' is not defined For some reason, when I try to use my ReutersParser in test.py, it throws an error that says it cannot find sgmllib, which is a built-in module. I'm at my wits' end trying to figure out why the import won't work. What's causing this NameError? I've tried importing sgmllib in my test.py and that works, so I don't understand why it can't find it when trying to run the constructor for my ReutersParser.

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  • How to only show simpleTip if certain conditions are true?

    - by Michael
    I'm working on my first jquery project and have a question regarding the simpletip plugin. I basically have a calendar where the user can click different meeting titles and the corresponding dates get shaded in with a certain color. I am then using the simpletip to display more detailed information about the meeting when the user hovers over that date. What I want is for the simpletip to only display if the cell is colored in, or "on". When the calendar is blank and no meetings are activated, I don't want all the simpletips to show. I have tried using an if statement with a .mouseover() - this works at first, when the cells are off, no simpletip. After the meeting is turned on and colored in, the first mouseover does nothing, then the second mouseover shows the simpletip, and then the simpletip remains active even after the cell is turned off. Hope this makes sense... please help! Thank you in advance

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  • regular expression repeating subexpression

    - by Michael Z
    I have the following text <pattern name="pattern1"/> <success>success case 1</success> <failed> failure 1</failed> <failed> failure 2</failed> <unknown> unknown </unknown> <pattern name="pattern2"/> <success>success case 2</success> <otherTag>There are many other tags.</otherTag> <failed> failure 3</failed> And the regular expression <failed>[\w|\W]*?</failed> matches all the lines contains failed tag. What do I need to to if I want to include the lines contains pattern tag as well? Basically, I want the following output: <pattern name="pattern1"/> <failed> failure 1</failed> <failed> failure 2</failed> <pattern name="pattern2"/> <failed> failure 3</failed> I am doing this in javascript, I do not mind of doing some intermediate steps.

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  • Question about fwrite API

    - by michael
    Hi, In C++, there is a fwrite() which writes a buffer to a file on disk: http://www.cplusplus.com/reference/clibrary/cstdio/fwrite/ Can you please tell me if there is any buffer inside that fwrite implementation? i.e. if I call fwrite() multiple times (say 10 times), does it actually invoke file i/o 10 different times? Thank you.

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  • How to access a subset of XML data in Java when the XML data is too large to fit in memory?

    - by Michael Jones
    What I would really like is a streaming API that works sort of like StAX, and sort of like DOM/JDom. It would be streaming in the sense that it would be very lazy and not read things in until needed. It would also be streaming in the sense that it would read everything forwards (but not backwards). Here's what code that used such an API would look like. URL url = ... XMLStream xml = XXXFactory(url.inputStream()) ; // process each <book> element in this document. // the <book> element may have subnodes. // You get a DOM/JDOM like tree rooted at the next <book>. while (xml.hasContent()) { XMLElement book = xml.getNextElement("book"); processBook(book); } Does anything like this exist?

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  • Two Column Theme, Help, to make both columns seperately Scrollable.

    - by Michael macDonald
    Hey, I am not sure what to do on this one, I'm not a programmer, but trying to learn CSS as this is how the theme I am using was coded in. I've gotten quite far on my own, but this one stumps me Its two column Theme... As far as I have been able to get, I can use the following: #left { width: 235px; padding: 10px; margin-left: 20px; position: fixed; line-height: 15px; If I change the position to Absolute, The whole page scrolls, If I leave it at Fixed, and add lets say, a Twitter feed, or other type of text that takes me past its reading where you would normally scroll, Its just cut off, cannot get to it, hightlight or scroll.. I've also toyed with the idea, of changing the theme to a 3 column theme, but Again, not a programmer, and i'd be really confused. anyhelp would be great... My Website is at 99lessoxygen.tumblr.com, code was found from http://nigredotheme.tumblr.com

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  • Greasemonkey script, that creates Kineticjs drag and drop canvas over every website

    - by Michael Moeller
    I'd like to put a drag and drop canvas over every website I visit in Firefox. My Greasemonkey script puts a drag and drop canvas under every page: kinetic.user.js: // ==UserScript== // @name kineticjs_example // @description Canvas Drag and Drop // @include * // @require http://ajax.googleapis.com/ajax/libs/jquery/1.3.2/jquery.min.js // @require http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.7.2.min.js // ==/UserScript== var div = document.createElement( 'div' ); with( div ) { setAttribute( 'id', 'container' ); } // append at end document.getElementsByTagName( 'body' )[ 0 ].appendChild( div ); var stage = new Kinetic.Stage({ container: 'container', width: 1000, height: 1000 }); var layer = new Kinetic.Layer(); var rectX = stage.getWidth() / 2 - 50; var rectY = stage.getHeight() / 2 - 25; var box = new Kinetic.Rect({ x: rectX, y: rectY, width: 100, height: 50, fill: '#00D2FF', stroke: 'black', strokeWidth: 4, draggable: true }); // add cursor styling box.on('mouseover', function() { document.body.style.cursor = 'pointer'; }); box.on('mouseout', function() { document.body.style.cursor = 'default'; }); layer.add(box); stage.add(layer); How can I drag and drop this shape over the entire website?

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  • Java Null Pointer Exception :-(

    - by John-Michael Reed
    I've got a Null Pointer Exception in my main that just won't go away and I'm totally out of ideas. The error is on the line "Board[x][y].color = 2;" in which Board is a public, static array of piece objects that contain instance variables like the one "color" that is being set to 2 in the above statement. Pieces is not static - that is there are many different copies of pieces, each with its own data, but only one board. The array has been initialized and defined as both public Piece[][] Board = new Piece[8][8] and public static Piece[][] Board = new Piece[8][8], but no matter how I mess around with it (getting rid of static, putting the variable in another object, etc.), I can't seem to get the error to go away. Help?

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  • Reading data from a MySQL database into a HTML Table?

    - by Michael McKay
    So i am working on a project and need some advice. I have a MySQL database that stores events, i know how to code this functionality in PHP but im just stuck of a few specifics. As the project that I am creating is a timetable, the most important attributes are the day of the event, starting time and finishing time. Once i have read this data from the MYSQL database using my PHP script, how do i go about inserting these events in to a html timetable? Lets say i have record like below in my events table: Event ID = 01 Event Day = Monday Event Start = 12:00 Event End = 14:00 How would I then put that into a html table, bearing in mind that i may have mutiple events for a day?

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  • Using static variable in android

    - by michael
    Hi, In android, is it recommend to use static variable? E.g, implement a Singleton pattern in Java, I usually do: private static A the_instance; public static A getInstance() { if (the_instance == null) { the_instance = new A(); } return the_instance; } My question is when do that get free by android JVM? Thank you.

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  • Deselecting an element in jQuery

    - by Michael Itzoe
    I have a collection of span elements. In the code I have a global variable that represents the "selected" object. Using the click event when a span is clicked I reset the object's class, reset the global variable, then set the object to the variable and change its class (to make it "highlighted"). This effectively toggles selection when clicking an object. var currentItem = null; $( ".item" ).click( function() { if( $( this ).hasClass( "selected" ) ) { $( this ).removeClass( "selected" ) currentItem = null; } else { if( $( ".item" ).hasClass( "selected" ) ){ $( ".item" ).removeClass( "selected" ) } $( this ).addClass( "selected" ); currentItem = $( this ); } } ); What I'd like to be able to do is unselect when clicking on an empty area of the page. I tried creating a click event on the body object, but that overrode the span click event so nothing was selected. I'm a complete jQuery noob and not sure where to go with this.

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  • Geographic obstructions in radius searches

    - by Michael Papile
    Suppose I have an application a search for all gas stations within 10 mile radius of a certain location. However one side of this location is surrounded by a mountain range that you have to drive 50 miles to get around. You would not want to return results from the other side of the mountain. What are some good algorithms/techniques to deal with such a problem? I know with point to point searches you can use path costs but I am not sure what the technique is with radius searches.

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  • MSBuild imported script directory

    - by Michael K.
    In Visual Studio 2010 we have MSBuild for C++ project. Also we can add additional custom properties files "*.props" to projects, which are just MSBuild scripts. Is it possible in imported "some.props" file know its directory? for example there is "project.vcxproj" file and "common.props" file. I would like to write something: <IncludeDir>$( [and something for common.props file directory here] )\include</IncludeDir> What should I write there?

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  • Need recommendation for object serialization library in c++

    - by michael
    Hi, I am looking for recommendation for object serialization/deserialization library in c++? Which one are the most advanced and open-sourced? Can it handle Any class that users defined? Object hierarchy (parent and child classes)? A Tree of objects? Class A has an attribute of Class B which has an attribute of Class C? STL containers? Class A has a vector of Class B? A cyclic of objects? Class A has a pointer pointing to B which has a pointer to A? I find boost serialization library. I am not sure what is its limitation from http://www.boost.org/doc/libs/1_42_0/libs/serialization/doc/tutorial.html

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  • Linq Order By a subtable

    - by Michael
    Hello, My question is how to sort a Linq query by a sub table: Table Apps: - app_id - name Table AppStatus: - app_status_id - app_id - severity - status_date I would like to have a query with all the apps, sorted by the last status severity: app_id name 1 first 2 second 3 third app_status_id app_id severity status_date 1 1 5 12-4-2010 2 1 2 15-4-2010 3 2 7 10-4-2010 4 3 3 13-4-2010 Now i want it sorted like: app_id name 3 third 1 first 2 second Can anyone help me with a LINQ query for this. I tried the following already, but that didn't work: var apps = from apps in dc.Apps orderby apps.AppStatus.LastOrDefault().severity select apps;

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  • Does a syntax for this exist? In any language?

    - by Michael
    It seems pretty common to me to have an argument, in a dynamically typed language that is either an Object or a key to lookup that object. For instance when I'm working with a database I might have a method getMyRelatedStuff(person) All I really need to lookup the related stuff is the id of the person so my method could look like this in python: def getMyRelatedStuff(person_or_id): id = person_or_id.id if isinstance(person,User) else person_or_id #do some lookup Or going the other direction: def someFileStuff(file_or_name): file = file_or_name if hasattr(file,'write') else open(file_or_name)

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