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  • How to print the address an ada access variable points to?

    - by georg
    I want to print the address of an access variable (pointer) for debugging purposes. type Node is private; type Node_Ptr is access Node; procedure foo(n: in out Node_Ptr) is package Address_Node is new System.Address_To_Access_Conversions(Node); use Address_Node; begin Put_Line("node at address " & System.Address_Image(To_Address(n))); end foo; Address_Image returns the string representation of an address. System.Address_To_Access_Conversions is a generic package to convert between addresses and access types (see ARM 13.7.2), defined as follows: generic type Object(<>) is limited private; package System.Address_To_Access_Conversions is -- [...] type Object_Pointer is access all Object; -- [...] function To_Address(Value : Object_Pointer) return Address; -- [...] end System.Address_To_Access_Conversions; gnat gives me the following errors for procedure foo defined above: expected type "System.Address_To_Access_Conversions.Object_Pointer" from instance at line... found type "Node_Ptr" defined at ... Object_Pointer ist definied as access all Object. From my understanding the type Object is Node, therefore Object_Ptr is access all Node. What is gnat complaining about? I guess my understanding of Ada generics is flawed and I am not using System.Address_To_Access_Conversions correctly. EDIT: I compiled my code with "gnatmake -gnatG" to see the generic instantiation: package address_node is subtype btree__clear__address_node__object__2 is btree__node; type btree__clear__address_node__object_pointer__2 is access all btree__clear__address_node__object__2; function to_address (value : btree__clear__address_node__object_pointer__2) return system__address; end address_node; btree__node is the mangled name of the type Node as defined above, so I really think the parameter type for to_address() is correct, yet gnat is complaining (see above).

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  • Limiting one of each Runnable type in ExecutorService queue.

    - by Andrew
    I have an Executors.newFixedThreadPool(1) that I send several different tasks to (all implementing Runnable), and they get queued up and run sequentially correct? What is the best way to only allow one of each task to be either running or queued up at one time? I want to ignore all tasks sent to the ExecutorService that are already in the queue.

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  • Execute code on assembly load

    - by Dmitriy Matveev
    I'm working on wrapper for some huge unmanaged library. Almost every of it's functions can call some error handler deeply inside. The default error handler writes error to console and calls abort() function. This behavior is undesirable for managed library, so I want to replace the default error handler with my own which will just throw some exception and let program continue normal execution after handling of this exception. The error handler must be changed before any of the wrapped functions will be called. The wrapper library is written in managed c++ with static linkage to wrapped library, so nothing like "a type with hundreds of dll imports" is present. I also can't find a single type which is used by everything inside wrapper library. So I can't solve that problem by defining static constructor in one single type which will execute code I need. I currently see two ways of solving that problem: Define some static method like Library.Initialize() which must be called one time by client before his code will use any part of the wrapper library. Find the most minimal subset of types which is used by every top-level function (I think the size of this subset will be something like 25-50 types) and add static constructors calling Library.Initialize (which will be internal in that scenario) to every of these types. I've read this and this questions, but they didn't helped me. Is there any proper ways of solving that problem? Maybe some nice hacks available?

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  • Using implicit conversion as a substitute for multiple inheritance in .NET

    - by Daniel Plaisted
    I have a situation where I would like to have objects of a certain type be able to be used as two different types. If one of the "base" types was an interface this wouldn't be an issue, but in my case it is preferable that they both be concrete types. I am considering adding copies of the methods and properties of one of the base types to the derived type, and adding an implicit conversion from the derived type to that base type. Then users will be able treat the derived type as the base type by using the duplicated methods directly, by assigning it to a variable of the base type, or by passing it to a method that takes the base type. It seems like this solution will fit my needs well, but am I missing anything? Is there a situation where this won't work, or where it is likely to add confusion instead of simplicity when using the API?

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  • Guide for http://www.ch-werner.de/javasqlite java wrapper library for SQlite?

    - by Tom Nielsen
    I'm working on a large computer science school project using java and SQlite. After finding out that the zentus.org wrapper errors on databases with ON DELETE and ON UPDATE clauses set, I have changed to the other wrapper found at http://www.ch-werner.de/javasqlite. However, I find the documentation lacking somewhat when trying to get an overview on how it works and how to use it, and the function descriptions are very very short, and you have to scan through every function and somewhat guess how they work and what they do. I wasn't able to find any guides on google on how to use it. My question: Does anyone know a link for a guide or tutorial for the ch-werner.de/javasqlite wrapper, or else can give me a basic code example, or give a quick overview of querying the database and the most used functions, and how to use them?

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  • How to use mmap to point to STL type?

    - by srikfreak
    I have a mmap typecast to a char pointer char *ptr; ptr = (char *)mmap(0, FILESIZE, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); This was my earlier code. But now I want to use a map instead of char * as the requirements changed. Now, my map is declared as map i_s_map; How do I change my mmap call to point to the map?

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  • How would I best address this object type heirachy? Some kind of enum heirarchy?

    - by FerretallicA
    I'm curious as to any solutions out there for addressing object heirarchies in an ORM approach (in this instance, using Entity Framework 4). I'm working through some docs on EF4 and trying to apply it to a simple inventory tracking program. The possible types for inventory to fall into are as follows: INVENTORY ITEM TYPES: Hardware PC Desktop Server Laptop Accessory Input (keyboards, scanners etc) Output (monitors, printers etc) Storage (USB sticks, tape drives etc) Communication (network cards, routers etc) Software What recommendations are there for handling enums in a situation like this? Are enums even the solution? I don't really want to have a ridiculously normalised database for such a relatively simple experiment (eg tables for InventoryType, InventorySubtype, InventoryTypeToSubtype etc). I don't really want to over-complicate my data model with each subtype being inherited even though no additional properties or methods are included (except PC types which would ideally have associated accessories and software but that's probably out of scope here). It feels like there should be a really simple, elegant solution to this but I can't put my finger on it. Any assistance or input appreciated!

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  • Is there a /users/www-data type directory in RedHat/Fedora?

    - by Yarin
    I'm trying to setup web2py on my Fedora server, and the instructions, written for Debian, are telling me to install it in the /users/www-data directory. I realize that Fedora uses a default 'apache' user for running Apache, and Debian uses a 'www-data' user, but there's no corresponding /users/apache directory on my machine... Here are the instructions http://web2py.com/book/default/section/11/2

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  • templates of functions

    - by anotr67
    I'm told to create template of function , that will take 4 arguments : pointer reference pointer to array pointer to function How to perform this task ? I was trying : template<typename TYPE> TYPE biggest(TYPE *L, TYPE $M, TYPE *K[], TYPE *O()) { } but it is wrong.

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  • Intellij Idea 13.x and ASM 5.x library incompatible?

    - by Jarrod Roberson
    I can't get Intellij Idea 13.0 to compile my code against ASM 5.0.3 I have a multi-module Maven project. It compiles and installs successfully. Apparently com.google.findbugs:findbugs has a dependency on asm:asm:3.3 and I want to use org.ow2.asm:asm:5.0.3 to manipulate some bytecode. So in the parent pom.xml I exclude the asm:asm:3.3 dependencies from the classpath. This works fine when I run mvn install from the command line. I can't get the Build - Make Project menu selection to work in Intellij Idea. Here is the relevant parts of my pom.xml files. parent.pom <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-tree</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-util</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>org.ow2.asm</groupId> <artifactId>asm-commons</artifactId> <version>5.0.3</version> </dependency> <dependency> <groupId>com.google.code.findbugs</groupId> <artifactId>findbugs</artifactId> <version>2.0.3</version> <exclusions> <exclusion> <groupId>asm</groupId> <artifactId>asm</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-commons</artifactId> </exclusion> <exclusion> <groupId>asm</groupId> <artifactId>asm-tree</artifactId> </exclusion> </exclusions> </dependency> Here is the code that is failing 18 public static void main(final String[] args) throws IOException 19 { 20 final InputStream is = NotEmptyTest.class.getResourceAsStream("/com/vertigrated/annotation/NotEmptyTest.class"); 21 final ClassReader cr = new ClassReader(is); 22 final ClassNode cn = new ClassNode(); 23 cr.accept(cn, 0); 24 for (final MethodNode mn : cn.methods) 25 { 26 - 38 snipped for brevity 39 } 40 } 41 } Here is the error message: Information:Using javac 1.7.0_25 to compile java sources Information:java: Errors occurred while compiling module 'tests' Information:Compilation completed with 1 error and 2 warnings in 2 sec Information:1 error Information:2 warnings /<path to my source code>/NotEmptyTest.java Error:Error:line (24)java: incompatible types required: org.objectweb.asm.tree.MethodNode found: java.lang.Object Warning:Warning:java: /<path to my project>//NotEmptyTest.java uses unchecked or unsafe operations. Warning:Warning:java: Recompile with -Xlint:unchecked for details. As you can see in the screen capture, it reports the correct version of the libraries in the Javadoc but the AutoComplete shows the old 3.3 non-typesafe return value of List instead of List<MethodNode>: Here is what Maven knows, which is correct: [INFO] --- maven-dependency-plugin:2.8:list (default-cli) @ tests --- [INFO] [INFO] The following files have been resolved: [INFO] com.google.code.findbugs:bcel:jar:2.0.1:compile [INFO] junit:junit:jar:4.11:test [INFO] xml-apis:xml-apis:jar:1.0.b2:compile [INFO] com.apple:AppleJavaExtensions:jar:1.4:compile [INFO] javax.inject:javax.inject:jar:1:compile [INFO] jaxen:jaxen:jar:1.1.6:compile [INFO] org.ow2.asm:asm-util:jar:5.0.3:compile [INFO] com.google.inject:guice:jar:3.0:compile [INFO] dom4j:dom4j:jar:1.6.1:compile [INFO] com.google.code.findbugs:jFormatString:jar:2.0.1:compile [INFO] net.jcip:jcip-annotations:jar:1.0:compile [INFO] org.ow2.asm:asm-tree:jar:5.0.3:compile [INFO] commons-lang:commons-lang:jar:2.6:compile [INFO] com.google.code.findbugs:jsr305:jar:2.0.1:compile [INFO] org.hamcrest:hamcrest-core:jar:1.3:test [INFO] aopalliance:aopalliance:jar:1.0:compile [INFO] com.google.code.findbugs:findbugs:jar:2.0.3:compile [INFO] org.ow2.asm:asm-commons:jar:5.0.3:compile [INFO] org.ow2.asm:asm:jar:5.0.3:compile How do I get Intellij Idea to use the correct dependency internally?

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  • jQuery autocomplete not always working on elements

    - by PoweRoy
    I'm trying to create a greasemonkey script (for Opera) to add autocomplete to input elements found on a webpage but it's not completely working. I first got the autocomplete plugin working: // ==UserScript== // @name autocomplete // @description autocomplete // @include * // ==/UserScript== // Add jQuery var GM_JQ = document.createElement('script'); GM_JQ.src = 'http://jquery.com/src/jquery-latest.js'; GM_JQ.type = 'text/javascript'; document.getElementsByTagName('head')[0].appendChild(GM_JQ); var GM_CSS = document.createElement('link'); GM_CSS.rel = 'stylesheet'; GM_CSS.href = 'http://dev.jquery.com/view/trunk/plugins/autocomplete/jquery.autocomplete.css'; document.getElementsByTagName('head')[0].appendChild(GM_CSS); var GM_JQ_autocomplete = document.createElement('script'); GM_JQ_autocomplete.type = 'text/javascript'; GM_JQ_autocomplete.src = 'http://dev.jquery.com/view/trunk/plugins/autocomplete/jquery.autocomplete.js'; document.getElementsByTagName('head')[0].appendChild(GM_JQ_autocomplete); // Check if jQuery's loaded function GM_wait() { if(typeof window.jQuery == 'undefined') { window.setTimeout(GM_wait,100); } else { $ = window.jQuery; letsJQuery(); } } GM_wait(); function letsJQuery() { $("input[type='text']").each(function(index) { $(this).val("test autocomplete"); }); $("input[type='text']").autocomplete("http://mysite/jquery_autocomplete.php", { dataType: 'jsonp', parse: function(data) { var rows = new Array(); for(var i=0; i<data.length; i++){ rows[i] = { data:data[i], value:data[i], result:data[i] }; } return rows; }, formatItem: function(row, position, length) { return row; }, }); } I see the 'test autocomplete' but using the Opera debugger(firefly) I don't see any communication to my php page. (yes mysite is fictional, but it works here) Trying it on my own page: <body> no autocomplete: <input type="text" name="q1" id="script_1"><br> autocomplete on: <input type="text" name="q2" id="script_2" autocomplete="on"><br> autocomplete off: <input type="text" name="q3" id="script_3" autocomplete="off"><br> autocomplete off: <input type="text" name="q4" id="script_4" autocomplete="off"><br> </body> This works, but when trying on another pages it sometimes won't: e.g. http://spitsnieuws.nl/ works but http://nu.nl and http://dumpert.nl don't work. Trying the autocomplete of jquery ui has more problems: // ==UserScript== // @name autocomplete // @description autocomplete // @include * // ==/UserScript== // Add jQuery var GM_JQ = document.createElement('script'); GM_JQ.src = 'http://ajax.googleapis.com/ajax/libs/jquery/1.4/jquery.min.js'; GM_JQ.type = 'text/javascript'; document.getElementsByTagName('head')[0].appendChild(GM_JQ); var GM_CSS = document.createElement('link'); GM_CSS.rel = 'stylesheet'; GM_CSS.href = 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/themes/base/jquery-ui.css'; document.getElementsByTagName('head')[0].appendChild(GM_CSS); var GM_JQ_autocomplete = document.createElement('script'); GM_JQ_autocomplete.type = 'text/javascript'; GM_JQ_autocomplete.src = 'http://ajax.googleapis.com/ajax/libs/jqueryui/1.8/jquery-ui.min.js'; document.getElementsByTagName('head')[0].appendChild(GM_JQ_autocomplete); // Check if jQuery's loaded function GM_wait() { if(typeof window.jQuery == 'undefined') { window.setTimeout(GM_wait,100); } else { $ = window.jQuery; letsJQuery(); } } GM_wait(); // All your GM code must be inside this function function letsJQuery() { $("input[type='text']").each(function(index) { $(this).val("test autocomplete"); }); $("input[type='text']").autocomplete({ source: function(request, response) { $.ajax({ url: "http://mysite/jquery_autocomplete.php", dataType: "jsonp", success: function(data) { response($.map(data, function(item) { return { label: item, value: item } })) } }) } }); } This will work on my html page, http://spitsnieuws.nl and http://dumpert.nl but not on http://nu.nl. (dumpert didn't work on the plugin autocomplete) //http://spitsnieuws.nl <input class="frmtxt ac_input" type="text" id="zktxt" name="query" autocomplete="off"> //http://dumpert.nl <input type="text" name="srchtxt" id="srchtxt"> //http://nu.nl <input id="zoekfield" name="q" type="text" value="Zoek nieuws" onfocus="this.select()" type="text"> Anyone know why the autocomplete functionality doesn't work? Why the request to the php page is not being made? And why I can't add my autocomplete to google.com?

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  • Django date filter: how come the format used is different from the one in datetime library ???

    - by Sébastien Piquemal
    Hello ! For formatting a date using date filter you must use the following format : {{ my_date|date:"Y-m-d" }} If you use strftime from the standard datetime, you have to use the following : my_date.strftime("%Y-%m-%d") So my question is ... isn't it ugly (I guess it is because of the % that is used also for tags, and therefore is escaped or something) ? But that's not the main question ... I would like to use the same DATE_FORMAT parametrized in settings.py all over the project, but it therefore seems that I cannot ! Is there a work around (for example a filter that removes the % after the date has been formatted like {{ my_date|date|dream_filter }}, because if I just use DATE_FORMAT = "%Y-%m-%d" I got something like %2001-%6-%12)?

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  • How to use infinit live streams with JAVE library? (Java, ffmpeg)

    - by Ole Jak
    So I want to use JAVE to save mp3 radio stream to my File system. I have this code for file saving but what shall I do to save a stream (stop on timer for ex) File source = new File("source.wav"); File target = new File("target.mp3"); AudioAttributes audio = new AudioAttributes(); audio.setCodec("libmp3lame"); audio.setBitRate(new Integer(128000)); audio.setChannels(new Integer(2)); audio.setSamplingRate(new Integer(44100)); EncodingAttributes attrs = new EncodingAttributes(); attrs.setFormat("mp3"); attrs.setAudioAttributes(audio); Encoder encoder = new Encoder(); encoder.encode(source, target, attrs);

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  • C#, WinForms: Which view type for periodically updated list?

    - by rdoubleui
    I'm having an application, that periodically polls a web service (about every 10 seconds). In my application logic I'm having a List<Message> holding the messages. All messages have an id, and might be received out of order. Therefore the class implements the Comparable Interface. What WinForm control would fit to be regurarly updated (with the items in order). I plan to hold the last 500 messages. Should I sort the list and then update the whole form? Or is data binding approriate (concerning performance)?

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  • CStdioFile Undeclared Identifier

    - by Eric Regnier
    I am unable to compile my code when using a CStdioFile type. I have included the afx.h header file but I am still receiving errors. What I am trying to do is write a cstring that contains an entire xml document to file. This cstring contains comments inside of it, but when I use other objects such as wofstream to write it to file, these comments are striped out for some reason. So that is why I am trying to write this to file using CStdioFile now. If anyone can help me out as to why I cannot compile my code using CStdioFile, or any other way to write a cstring that contains xml comments to file, please let me know! Below is my code using CStdioFile: CStdioFile xmlFile; xmlFile.Open( "c:\\test.txt", CFile::modeCreate | CFile::modeWrite | CFile::typeText ); xmlFile.WriteString( m_sData ); xmlFile.Close(); And my errors: error C2065: 'CStdioFile' : undeclared identifier error C2065: 'modeCreate' : undeclared identifier error C2065: 'modeWrite' : undeclared identifier error C2065: 'typeText' : undeclared identifier error C2065: 'xmlFile' : undeclared identifier error C2146: syntax error : missing ';' before identifier 'xmlFile' error C2228: left of '.Close' must have class/struct/union type type is ''unknown-type'' error C2228: left of '.Open' must have class/struct/union type type is ''unknown-type'' error C2228: left of '.WriteString' must have class/struct/union type type is ''unknown-type'' error C2653: 'CFile' : is not a class or namespace name error C2653: 'CFile' : is not a class or namespace name error C2653: 'CFile' : is not a class or namespace name error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup error C3861: 'xmlFile': identifier not found, even with argument-dependent lookup

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  • What is the best way to handle this type of inclusive logic in Ruby?

    - by Steve McLelland
    Is there a better way of handling this in Ruby, while continuing to use the symbols? pos = :pos1 # can be :pos2, :pos3, etc. if pos == :pos1 || pos == :pos2 || pos == :pos3 puts 'a' end if pos == :pos1 || pos == :pos2 puts 'b' end if pos == :pos1 puts 'c' end The obvious way would be swapping out the symbols for number constants, but that's not an option. pos = 3 if pos >= 1 puts 'a' end if pos >= 2 puts 'b' end if pos >= 3 puts 'c' end Thanks.

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  • Is there a Java library with 3D spline functions?

    - by Liam
    In particular, I need a way to represent a curve/spline that passes through a set of known 3D points, and a way of finding other points on the curve/spline, by subdivision/interpolation. For example, if I have a set of points P0 to PN, I want to find 100 points between P0 and P1 that are on a spline that passes through P0 and P1. I see that Java3D's KBRotPosScaleSplinePathInterpolator performs such a calculation, but it is tied to that API's scenegraph model and I do not see how to return the values I need.

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  • Is it possible to build a WinForm app (or another type of .NET app) which allows me to interact with

    - by RoboShop
    I'm learning Chinese at the moment and I have gotten my hand on a Chinese dictionary definition. Now I would like to make an interface. All I really want the application to do is when I point my mouse pointer over any text on the screen (in any window), it would identify the text I am pointing at and then display a small form over it, which would the chinese transaction. Is that possible to do? Can WinForms apps interact with windows outside of it's own application?

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