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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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• Will a destructor destroy a static member?

  - by Jeremy Simon

  Say I have: class A { A() {} ~A() {} }; class B { public: B() {} ~B() {} private: static A mA; }; B* pB = new B; delete pB; When I call delete pB, B's destructor will be called. Will this then call the destructor for static member A?

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• what's the different between a const version and mutable version member function

  - by Yongwei Xing

  Hi all I am very confused about the const version and mutable version member function like below:: value_type& top() { return this.item } const value_type& top() const { return this.item } What is the different these two functions? In what situation they would be used? Could someone give me some explanation about it? Best Regards,

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• when does static member gets memory.

  - by vaibhav

  I have a class which have a static member. As I understand all static members are common for all instance of the class. So it means static members would get memory only once. Where is this memory is allocated (Stack or Heap) and when this memory get allocated.

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• Create thread is not accepting the member functon

  - by prabhakaran

  I am trying to create a class for network programming. This will create a general purpose socket with thread. But when I tried to creat the thread using createthread(). The third argument is producing errors. And from the net I came to know that I can't use the member functions as a argument to the createthread(). Is there any thing by which I can achieve this.

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• Valid applications of member hiding with the new keyword in c#

  - by James L

  I've been using c# since version 1, and have never seen a worthwhile use of member hiding. Do you know of any?

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• How to define type member constant in F# ?

  - by zproxy

  In C# one can define a type member constant like this: class Foo { public const int Bar = 600; } The IL shall looks like this. .field public static literal int32 Bar = int32(600) How can I do the same within Visual F# / FSharp? I tried this to no avail: [<Sealed>] type Foo() = [<Literal>] let Bar = 600

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• Fatal error: Call to a member function get() in joomla module

  - by vipinsahu

  i am developing a module in joomla . all things goes fine except Fatal error: Call to a member function get() getting this error when i m using $username = $parem-get('username') but if i m using $username = 'foo'; all things goes fine Thanks

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• How do you make a private member in the base class become a public member in the base class?

  - by jasonline

  Consider the following code: class Base { void f() { } }; class Derived: public Base { public: }; What can you change in the derived class, such that you can perform the following: Derived d; d.f(); If the member is declared as public in the base class, adding a using declaration for Base::f in the derived class public section would've fix the problem. But if it is declared as private in the base class, this doesn't seem to work.

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• Moving a member of a List to the Front of the List

  - by Shonna

  How would one create a method that takes an integer i, and move the member of a List<T> at index i from its current position to the front of the list?

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• AutoMapper: setup member name matching convention

  - by epitka

  I tried setting up a member name mapping convention so that the source members ending with a "Id" are mapped to destination members without Id. For example UserId - User How does one do this? I tried using SourceMemberNameTransformer without success. Also tried using RecognizePostfixes(). this.SourceMemberNameTransformer = s => { return s.Replace("Id", string.Empty); };

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• POWERSHELL; Recursive Get-Member for Com Object

  - by Zion

  I have a statement "New-Object -com Indesign.Application.Cs5 | Get-Member" It works as expected for the top level. How would one recurse the entire object tree and output results in a readable/spreadsheet format (if possible).

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• shared_ptr as class member

  - by idimba

  It's common to declared contained objects as a pointers to that class, while "forward declarating" them in header file. This in order to reduce physical dependencies in code. For example class B; // forward declaration class A { private: B* pB; }; Would it be good idea to declare such a member as shared_ptr, instead of naked pointer? I would prefer scoped_ptr, but AFAIKit it won't be in standard.

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• Struct member [ array vs pointer ]

  - by Walidix

  What is the benefit of declaring a C structure member as in array of size 1 instead of a pointer : struct { a_struct_t a_member[1]; ... }b_struct; Thanks in advance

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• group member dropdown in visual studio 2008

  - by knittl

  in visual studio is the member dropdown, where you can select all members of the current type alphabetically ordered. is there an option which allows grouping of the members? i.e. all constructors before all methods before all properties before all events before all fields? if there is not, bad for me, i guess—it would really enhance productivity

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• How can I pass a C++ member function to a C API as a parameter

  - by michael

  Hi, In my C++ program, I need to call this c API: GConn* gnet_conn_new (const gchar *hostname, gint port, GConnFunc func); where GConnFunc is defined as: void (*GConnFunc) (GConn *conn); My question is if I have a C++ class and have a member function like Class A { public: A(); void my_func (GConn* conn); } In my A::A() Constructor, how can I pass this-myfunc to gnet_conn_new as the GConnFunc parameter? Thank you.

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• How to free static member variable in C++?

  - by user299831

  Can anybody explain how to free memory of a static member Variable? In my understanding it can only be freed if all the instances of the class are destroyed. I am a little bit helpless at this point... Some Code to explain it: class ball { private: static SDL_Surface *ball_image; }; //FIXME: how to free static Variable? SDL_Surface* ball::ball_image = SDL_LoadBMP("ball.bmp");

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• C++ Class Construction and Member Initialization

  - by anachoret

  The first print shows the member value to be false, and the other two prints show it as true. Why does the first output differ from the last two? #include #include using namespace std; class MyClass { public: bool value; bool stuff; }; class Container { public: vector my_classes; Container() { MyClass c; cout

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• Hibernate (JPA) Entity with Static collection as a member

  - by Kyle Partridge

  Is it possible to have a static collection as a member of a hibernate entity? Say I have an object Question: public class Question { private String category; ... } Would it be possible to populate a static Set<String> that is a distinct set of all categories in the Database? I know I could just query this, but I was wondering if there was a more elegant solution, as it seems like something that other people may have come across.

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• How can make a variable (not class member) "read only" in C#

  - by devfreak

  Hi, I'm new to the C# world and I can't find a method to declare read only variable in C# (something like declaring "const" variable in c++). Is there one? I'll give you an example: ... int f() { return x; } // x is not const member ... void g() { int readOnlyVar = f(); // is there a method to declare readOnlyVar as read only or const // Some code in which I want to restrict access to readOnlyVar to read only }

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• LibreOffice Calc SEARCH and FIND functions

  - by TTT

  I am trying to process some data in Calc. One of the steps involve finding if a certain string is part of one of the column. I tried using FIND and SEARCH functions. Both behave in the same way and I am not getting correct results. E.g. Say I have following strings in Column A NY SF LON CAN US and am trying to put following formula in column C =SEARCH("NY",A2) The result is - cell C2 will have 1 (which is correct) but if the same formula is copied to other cells in column C - it gives me "#VALUE!" error and I am unable to find out why ? Any one has any ideas ? Thanks in advance TT

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• Command+tab, expose and many other functions stop working after screen sharing

  - by moshen

  When I'm away from my office mac I typically login via screen-sharing or VNC from home/another mac. Lately, after using screen sharing this way, my office mac will have several problems: Command+tab and Command+` no longer work Expose and other F-key functions no longer work ctrl+space to launch Google QSB no longer works Things I have tried to remedy this: Restarting the Finder process Restarting the Dock process Disabling the screensaver Unfortunately, the screensaver still runs... A connected issue? Deleting preference files for Dock/Finder/screensaver etc. The only thing that seems to work is a restart. I usually try and avoid that. System details: Macbook pro 13" OS v10.5.8

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• Firefox keyboard shortcuts to menu items / add-on functions

  - by Cel

  At the moment I'm using context menus a lot to access commands in Firefox, but I would like to replace this repetitive clicking and searching with keyboard shortcuts for the common tasks that I perform. How to assign keys to add-on functionality? E.g. I use Close Other Tabs from Tab Mix Plus a lot - but I could not find any add-on that allows me to create a key combination for it e.g. Ctrl Alt Shift F4? My search did yield Key config, but this extension does not allow mapping to add-on functions I thought Menu Editor might be relevant, as you can change menus with it, and re-arrange even add-on items A rather demanding solution here, which seems to require re-compiling some jar files Customizing menu shortcuts in Firefox

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• Dediced server for all network functions?

  - by Alan

  I want to set up a fictional network configuration for a school in my neighborhood. They have about 50 computers altogether, 2X20 in computer rooms for students and another 10 scattered around for various professors. They should all access the internet through a dedicated Linux router machine. What they would like is to have domain names for those three computer groups. Lab1, Lab2 and Professors. The computers in Lab2 and Lab1 should have static ip and should all be named by numbers. So there should be 1@Lab1, 2@Lab1.... etc. And the Professors network should have a DHCP, with authentication. Is it an ok solution to have all these functions on a single server? (The one which will be used as a router) Do I have to set a local DNS for domain naming? Do the host names for Lab computers have to be set on the clients, or can they be automatically assigned?

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• iPhone OpenGL ES missing functions should be there - glBlendFuncSeparate etc

  - by quixoto

  I'm using OpenGL ES 1.1 on the iPhone, and I'd like to use the following functions: glBlendFuncSeparate glBlendColor With their related constants. These didn't exist in early iPhone GL implementations, but according to this page: http://developer.apple.com/iphone/library/releasenotes/General/iPhone30APIDiffs/index.html they should be there in 3.0+, which I'm building for. But I'm getting "implicit definition" warnings. What do I need to do to get those functions? Thanks!

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