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  • Tutorials and Introductions to C++ Expression Templates

    - by grrussel
    What are good introductions to the creation of C++ expression template systems? I would like to express arithmetic on user defined types while avoiding temporary values (which may be large), and to learn how to do this directly rather than applying an existing library. I have found Todd Veldhuizen's original paper and an example from the Josuttis C++ Templates book, and an article by Kreft & Langer. I am looking for simple, clear expositions.

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  • C precision of double: compiler dependent?

    - by yCalleecharan
    Hi,on my 32-bit machine (with an Intel T7700 duo core), I have 15 precision digits for both double and long double types for the C language. I compared the parameters LDBL_DIG for long doubles and DBL_DIG for doubles and they are both 15. I got these answers using MVS2008. I was wondering if these results can be compiler dependent or do they just depend on my processor? Thanks a lot...

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  • using Linux vncviewer

    - by Darkoni
    when i am connecting to VNC server using wine on linux $ wine vncviewer.exe i have to enter: VNC Server: 1.1.1.21 Proxy/Reapeter: 195.29.18.33:1234 and then, when i connect, on top there is txt: 1.1.1.21:5900 (195.29.18.33:1234) mine question is: how to connect using vncviewer ? what to put in VNC_VIA_CMD ? $ export xlocalPort=1234 $ export xremoteHost=1.1.1.21 $ export xremotePort=5900 $ export xgateway=195.29.18.33 $ export VNC_VIA_CMD="/usr/bin/ssh -f -L $xlocalPort:$xremoteHost:$xremotePort $xgateway sleep 20" $ vncviewer $xremoteHost -via $xgateway and i get error: unable connect to socket: Connection refused (111) i was trying to help myself with page http://www.tightvnc.com/vncviewer.1.php Please help, couse i need to use "native" linux vncviewer installed by $ yum install tigervnc tigervnc.i686 0:1.0.90-0.13.20100420svn4030.fc13

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  • Mysql Text Storage?

    - by mii
    I was wondering if you where to have an article or articles with huge amounts of text, what would be better when creating the database structure for the articles text? And why? What will be the advantages or disadvantages if any?. I was thinking of using one of the data types below to hold the articles text for the MySQL database. VARCHAR TEXT MEDIUMTEXT LONGTEXT

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  • AFP / Apple Filling Protocol aka Netatalk access over Internet

    - by PJJ
    I got a simple cloud server and thought it would be nice to have mac native afp Volumes accesss. Installed Netatalk and this seems to work pretty nice. No sensitive data or something but I don't like to wake up someday and have my www docs rm-rfed by some kid h4x0r. Q1: Is afp encrypted? Q2: How can I make it (semi)secure? Q3: Does VPN makes sense for this? Q4: What would you do to get afp working over net? Opening any service meant for Lan only is a basic flaw, i know - but me be ignorant about it. According to Apple Dev only the authentication is encrypted or am I mssing something?

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  • Is there any reason for an object pool to not be treated as a singleton?

    - by Chris Charabaruk
    I don't necessarily mean implemented using the singleton pattern, but rather, only having and using one instance of a pool. I don't like the idea of having just one pool (or one per pooled type). However, I can't really come up with any concrete situations where there's an advantage to multiple pools for mutable types, at least not any where a single pool can function just as well. What advantages are there to having multiple pools over a singleton pool?

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  • Dynamic data-entry value store

    - by simendsjo
    I'm creating a data-entry application where users are allowed to create the entry schema. My first version of this just created a single table per entry schema with each entry spanning a single or multiple columns (for complex types) with the appropriate data type. This allowed for "fast" querying (on small datasets as I didn't index all columns) and simple synchronization where the data-entry was distributed on several databases. I'm not quite happy with this solution though; the only positive thing is the simplicity... I can only store a fixed number of columns. I need to create indexes on all columns. I need to recreate the table on schema changes. Some of my key design criterias are: Very fast querying (Using a simple domain specific query language) Writes doesn't have to be fast Many concurrent users Schemas will change often Schemas might contain many thousand columns The data-entries might be distributed and needs syncronization. Preferable MySQL and SQLite - Databases like DB2 and Oracle is out of the question. Using .Net/Mono I've been thinking of a couple of possible designs, but none of them seems like a good choice. Solution 1: Union like table containing a Type column and one nullable column per type. This avoids joins, but will definitly use a lot of space. Solution 2: Key/value store. All values are stored as string and converted when needed. Also use a lot of space, and of course, I hate having to convert everything to string. Solution 3: Use an xml database or store values as xml. Without any experience I would think this is quite slow (at least for the relational model unless there is some very good xpath support). I also would like to avoid an xml database as other parts of the application fits better as a relational model, and being able to join the data is helpful. I cannot help to think that someone has solved (some of) this already, but I'm unable to find anything. Not quite sure what to search for either... I know market research is doing something like this for their questionnaires, but there are few open source implementations, and the ones I've found doesn't quite fit the bill. PSPP has much of the logic I'm thinking of; primitive column types, many columns, many rows, fast querying and merging. Too bad it doesn't work against a database.. And of course... I don't need 99% of the provided functionality, but a lot of stuff not included. I'm not sure this is the right place to ask such a design related question, but I hope someone here has some tips, know of any existing work, or can point me to a better place to ask such a question. Thanks in advance!

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  • FTP Synchronization software for Mac or PC

    - by evanmcd
    Hi, I've been using FTP Synchronizer for awhile and generally have had pretty good results with it. But, I've just moved to a Mac full-time (at work as well as home now) so want to get a native client if I can. I've tried the only one that I've found - SuperFlexibleSynchronizer - but it crashed every time I loaded up an FTP to FTP synch attempt. The most important features to me are: 1) ability to synch with a large number of files (thousands), as I generally work on sites with large number of files. 2) FTP to FTP synch. This would be very helpful as I work with some CMS based sites for which users upload files while on staging and don't want to move files locally first before moving live. Thanks! Evan

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  • How to avoid overflow in expr. A * B - C * D

    - by Ir0nm
    I need to compute an expression which looks like: A*B - C*D, where their types are: signed long long int A, B, C, D; Each number can be really big (not overflowing its type). While A*B could cause overflow, at same time expression A*B - C*D can be really small. How can I compute it correctly? For example: MAX * MAX - (MAX - 1) * (MAX + 1) == 1, where MAX = LLONG_MAX - n and n - some natural number.

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  • xsd and wsdl incorrect file

    - by Gandalf StormCrow
    How to fix corrupted xsd and wsdl files, is there any IDE which can suggest what is wrong? such as eclipse for java code when pressing CTRL + 1 , or where can I find books tutorials to understand formatting of these file types better? thank you Here is concrete message error I have [ERROR] 'item' is already defined line 223 of file:/C:/project/src/main/resources/schema.xsd [ERROR] (related to above error) the first definition appears here line 22 of file:/C:/project/src/main/resources/schema.xsd

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  • Const unsigned char* to char8

    - by BSchlinker
    So, I have two types at the moment: const unsigned char* unencrypted_data_char; string unencrypted_data; I'm attempting to perform a simple conversion of data from one to the other (string - const unsigned char*) As a result, I have the following: strcpy((unencrypted_data_char),(unencrypted_data.c_str())); However, I'm receiving the error: error C2664: 'strcpy' : cannot convert parameter 1 from 'const unsigned char *' to 'char *' Any advise? I thought using reinterpret_cast would help, but it doesn't seem to make a difference.

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  • How do I prevent rpmbuild form injecting requirements into RPM package?

    - by Basilevs
    I'm creating an RPM package from native Python 2.5 one. Out corporate policy is to use python2.4 by default, so I'm adding a string Requires: python25 to a .spec file. When I look at created RPM file though, i see the following dependencies: rpm -qR -p ZSI-2.1_a1-py25.noarch.rpm /usr/bin/python2.5 python(abi) = 2.5 python25 rpmlib(CompressedFileNames) <= 3.0.4-1 rpmlib(PayloadFilesHavePrefix) <= 4.0-1 Dependency added by me is present, but other dependencies are also here. I'm unable to provide python(abi) = 2.5 dependency, because of dumb python25 package generated by our IT department where provides tag is incorrect. How do I remove automatically added dependencies from generated RPM?

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  • Inno Setup install for another user

    - by Steve
    When a user has restricted rights on his/her computer and runs my Inno Setup installer, Windows pop-up an administrator login prompt. The problem is that when the administrator types in his/her username and password and logs-in, Inno Setup thinks that he or she is the logged in user and installs my app for that user instead of the original one. (I'm installing files in the {userappdata} dir) Is there a way to overcome this limitation and install for the original restricted user?

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  • Do you gain any operations when you constrain a generic type using where T : struct?

    - by Fiona Holder
    This may be a bit of an abstract question, so apologies in advance. I am looking into generics in .NET, and was wondering about the where T : struct constraint. I understand that this allows you to restrict the type used to be a value type. My question is, without any type constraint, you can do a limited number of operations on T. Do you gain the ability to use any additional operations when you specify where T : struct, or is the only value in restricting the types you can pass in?

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  • Rating mechanisms

    - by Jasie
    Is there any place that showcases a bunch of different types of rating systems (like using multiple sliders, star ratings, up/down votes)? I'm trying to get ideas for a better rating system than just up/down (more criteria). (I'm not interested in the backend, but the human/computer interaction part of it).

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  • Make Visual Studios "Add Service Reference" Feature use an existing Class

    - by gencha
    When I add a service reference to my Visual Studio 2010 C# project, a new class for one of the types defined in the WSDL will be generated. A de-facto equivalent definition of that type already exists in our solution in a different assembly. When adding the SoapTypeAttribute to the existing class and replacing the references to the generated class in the generated code, everything runs perfectly and as expected. How would I tell Visual Studio to use the existing class in the generated code?

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  • How to implement an interface member that returns void in F#

    - by Drew Noakes
    Imagine the following interface in C#: interface IFoo { void Bar(); } How can I implement this in F#? All the examples I've found during 30 minutes of searching online show only examples that have return types which I suppose is more common in a functional style, but something I can't avoid in this instance. Here's what I have so far: type Bar() = interface IFoo with member this.Bar = void Fails with FS0010: Unexpected keyword 'void' in expression.

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  • Java - JPA - @Basic and @Embedded

    - by Yatendra Goel
    I am learning JPA from this tutorial. I have some confusions in understanding the following annotations: @Basic @Embedded Fields of an embeddable type default to persistent, as if annotated with @Embedded. If the fields of embeddable types defualt to persistent, then why would we need @Embedded

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  • Hibernate many-to-many mapping not saved in pivot table

    - by vincent
    I having problems saving many to many relationships to a pivot table. The way the pojos are created is unfortunately a pretty long process which spans over a couple of different threads which work on the (to this point un-saved) object until it is finally persisted. I associate the related objects to one another right after they are created and when debugging I can see the List of related object populated with their respective objects. So basically all is fine to this point. When I persist the object everything get saved except the relations in the pivot table. mapping files: <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.thebeansgroup.jwinston.plugin.orm.hibernate.object"> <class name="ShowObject" table="show_object"> <id name="id"> <generator class="native" /> </id> <property name="name" /> <set cascade="all" inverse="true" name="venues" table="venue_show"> <key column="show_id"/> <many-to-many class="VenueObject"/> </set> </class> </hibernate-mapping> and the other <?xml version="1.0" encoding="UTF-8"?> <!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd"> <hibernate-mapping package="com.thebeansgroup.jwinston.plugin.orm.hibernate.object"> <class name="VenueObject" table="venue_object"> <id name="id"> <generator class="native"/> </id> <property name="name"/> <property name="latitude" type="integer"/> <property name="longitude" type="integer"/> <set cascade="all" inverse="true" name="shows" table="venue_show"> <key column="venue_id"/> <many-to-many class="ShowObject"/> </set> </class> </hibernate-mapping> pojos: public class ShowObject extends OrmObject { private Long id; private String name; private Set venues; public ShowObject() { } public Long getId() { return id; } public void setId(Long id) { this.id = id; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set getVenues() { return venues; } public void setVenues(Set venues) { this.venues = venues; } } and the other: public class VenueObject extends OrmObject { private Long id; private String name; private int latitude; private int longitude; private Set shows = new HashSet(); public VenueObject() { } @Id @GeneratedValue(strategy = GenerationType.AUTO) public Long getId() { return id; } public void setId(Long id) { this.id = id; } public int getLatitude() { return latitude; } public void setLatitude(int latitude) { this.latitude = latitude; } public int getLongitude() { return longitude; } public void setLongitude(int longitude) { this.longitude = longitude; } public String getName() { return name; } public void setName(String name) { this.name = name; } public Set getShows() { return shows; } public void setShows(Set shows) { this.shows = shows; } } Might the problem be related to the lack of annotations?

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  • What is the minimum interface that has the Count property in .Net

    - by SoMoS
    Hello, I need to change a method that has one parameter that takes a serie of objects. I need to find the lowest Interface (in inheritance tree) that has the Count property. Until now I was using the IEnumerable but as this has not Count I need to change it to the wider interface possible so the method can work with the biggest number of types of series (collections, lists, arrays, etc). Thanks in advance.

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  • dual map structure implementation?

    - by Danra
    Hey, I'm looking for a standard dual-map structure - is there one implemented in std/boost/another standard C++ library? When I say "dual-map" I mean a map which can be indexed efficiently both by the key and the "value" (it actually has two key types instead of one key type and one value type). for example: dualmap<int,string> m; m[1] = "foo"; m["bar"] = 2 int a = m["bar"]; // a = 2 Thanks, Dan

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