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  • C++ adding friend to a template class in order to typecast

    - by user1835359
    I'm currently reading "Effective C++" and there is a chapter that contains code similiar to this: template <typename T> class Num { public: Num(int n) { ... } }; template <typename T> Num<T> operator*(const Num<T>& lhs, const Num<T>& rhs) { ... } Num<int> n = 5 * Num<int>(10); The book says that this won't work (and indeed it doesn't) because you can't expect the compiler to use implicit typecasting to specialize a template. As a soluting it is suggested to use the "friend" syntax to define the function inside the class. //It works template <typename T> class Num { public: Num(int n) { ... } friend Num operator*(const Num& lhs, const Num& rhs) { ... } }; Num<int> n = 5 * Num<int>(10); And the book suggests to use this friend-declaration thing whenever I need implicit conversion to a template class type. And it all seems to make sense. But why can't I get the same example working with a common function, not an operator? template <typename T> class Num { public: Num(int n) { ... } friend void doFoo(const Num& lhs) { ... } }; doFoo(5); This time the compiler complaints that he can't find any 'doFoo' at all. And if i declare the doFoo outside the class, i get the reasonable mismatched types error. Seems like the "friend ..." part is just being ignored. So is there a problem with my understanding? What is the difference between a function and an operator in this case?

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  • Facebook multi-friend-selector + new javascript API = BROKEN ?

    - by Simon_Weaver
    I am using the fb:serverfbml tag to render a multi-friend-selector inside an IFrame. I am using the new javascript API. I have been trying ALL DAY to get it working. When I click on the underlines 'selected' link (to filter by the selected friends) the whole page refreshes and the selected friends disappear. Does the multi-friend-selector just not work with the javascript API? <fb:serverfbml> <script type="text/fbml"> <fb:request-form action="http://apps.facebook.com/rollingrazor/" target="_top" method="POST" invite="true" type="Blah blah blah" content="Blah blah! &lt;fb:req-choice url=&quot;http://apps.facebook.com/rollingrazor/&quot; label=&quot;Let me check my friends&quot; /&gt;"> <fb:multi-friend-selector showborder="false" actiontext="Invite your friends" rows="5" cols="5" bypass="cancel" target="_top" /> </fb:request-form> </script> </fb:serverfbml> <div id="fb-root"></div> <script> window.fbAsyncInit = function () { FB.init({ appId: 'xxxxxxx', status: true, cookie: true, xfbml: true }); }; (function () { var e = document.createElement('script'); e.async = true; e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js'; document.getElementById('fb-root').appendChild(e); } ()); </script> Can someone give me a working example using new javascript API with a multi-friend-selector?

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  • software to allow a friend to look on your screen

    - by acidzombie24
    I want a friend of mine to review my code. I have a mic built into my laptop but i can use another software for voice chat. So i would like to have him to either view my screen (taking control might be fine) or show me his screen so he can talk about a specific piece of code. What software is good for this? We both think about security so an MS product (netmeeting? if that still exist on normal msn live installs) or an open source would be preferred. Should be free.

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  • Facebook iOS SDK Share Dialog - Sharing on a Friend's Wall

    - by JPK
    Is it possible to use the Facebook iOS SDK Share Dialog to share on a Friend's Wall? I know that it is possible to do this using the Feed Dialog, but that provides the user with a less than optimal experience, and seems to be discouraged by Facebook. It would be fantastic if we could configure the Share Dialog to share with one particular friend. Additionally, is there a way to share with a friend privately (such that it would be sent to Messages)? I have researched pretty extensively and it seems like there is not a way to do either of these things using the iOS SDK - I would just like to confirm that I am not missing something.

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  • Why friend function is preferred to member function for operator<<

    - by skydoor
    When you are going to print an object, a friend operator<< is used. Can we use member function for operator<< ? class A { public: void operator<<(ostream& i) { i<<"Member function";} friend ostream& operator<<(ostream& i, A& a) { i<<"operator<<"; return i;} }; int main () { A a; A b; A c; cout<<a<<b<<c<<endl; a<<cout; return 0; } One point is that friend function enable us to use it like this cout<<a<<b<<c What other reasons?

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  • Retrieving friend's likes from the Facebook Graph API

    - by Joe Frank
    Howdy- I have been tooling around with the Facebook Graph API and successfully retrieved back a list of my likes, and a list of my friends (once I authenticated using OAuth). But what I really want to achieve is pulling back my friend's likes. When I try and do that, obviously using the same URL that I use to pull back my own likes but subbing the friend's user id for "me", I don't get anything back, unless they have installed the app as well. Then I get them no problem. To be clear, I can only see the likes of friends who have installed my application. So clearly I am running into a security/rights issue of some sort. I could see where this would be the case; you simply aren't allowed to see your friend's likes unless they have installed the same app. Fair enough, but then how is blekko.com doing it? I even tried using FQL without much luck. I suspect I am missing something totally obvious. Anyone had any luck with this? Maybe with the Javascript API or one of the other access methods? Thanks in advance for any guidance.

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  • The SQL Server Reporting Services SDK for PHP Debuts

    - by The Official Microsoft IIS Site
    Microsoft has just released the SQL Server Reporting Services SDK for PHP, which enables PHP developers to easily create reports and integrate them in their web applications. The SDK offers a simple Application Programming Interface to interoperate with SQL Server Reporting Services, Microsoft's Reporting and Business Intelligence solution. Developers will be able to use the SDK to perform common operations like listing reports in PHP applications, providing custom report parameters from a PHP...(read more)

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  • Way to Remove Invite Limit on FBML Multi-Friend Selector

    - by David
    Hi there, I tried to look through various resources before posting here, but was having a surprisingly difficult time finding an answer to my question. Sorry in advance if I overlooked it. I'm currently trying to add the FBML Multi-Friend Selector to my Facebook page. It has a limit on the number of friends you can invite at a time ("Add up to 20 of your friends by clicking on their pictures below"). From what I've looked through it sounds like 20 is the max number of friends a user can invite, but then looking at Mint's page, they have a 22 max invite (http://www.facebook.com/mint?ref=ts) I thought it might be based on number of page fans, as Mint has 56,000, but that doesn't seem to be the case as this page only has 256 fans and have a max of 26 friend invites (http://www.facebook.com/tivix?v=app_106437999388442). Therefore, I don't really understand how this system works. Is there a way for me to increase to 26? Unlimited? Thanks for your help!

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  • Conditions for a traditional friends system vs. open following system

    - by Dan
    I'm just curious for everyone who is developing social sites out there. When you build a method for connecting users, do you prefer to use a following-style system (follow me, you can see all of my information and I can just choose to follow you back), or instead do you choose to have a friends-style system (I have to allow you see all of my information on your homepage, even if it is open to the public, vise versa). Why and under what circumstances do you use each? How do you manage privacy between your users? Have you use another way to connect your users? Examples of what methods you've choose and how you manage the user's privacy (private by default vs open to the web) are awesome; it could show correlation and provides an actual look.

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  • "Send it to a friend" button on a webpage

    - by kender
    Hey, How often do we see stuff like "Send this page to a friend" on a webpages? Well, I see them quite often. My question is, how do you guys see it's effectiveness? If I hit a webpage that's interesting, and I think my friend would enjoy it, I can just copy the URL from my browser bar, paste it into the email and press "Send" button. In my opinion, it's usually faster and less mistake-aware then the button/link like this on the webpage. In addition, I'm not really sure what this website does with the emails I enter there - don't they store it and then sell for $1/100 addresses to spammers? My question is - when you design a website, do you put such links on the pages (it's often seen on sites with some news/articles)? Does it even make sense?

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  • Why we can't we overload "=" using friend function?

    - by ashish-sangwan
    Why it is not allowed to overload "=" using friend function? I have written a small program but it is giving error. class comp { int real; int imaginary; public: comp(){real=0; imaginary=0;} void show(){cout << "Real="<<real<<" Imaginary="<<imaginary<<endl;} void set(int i,int j){real=i;imaginary=j;} friend comp operator=(comp &op1,const comp &op2); }; comp operator=(comp &op1,const comp &op2) { op1.imaginary=op2.imaginary; op1.real=op2.real; return op1; } int main() { comp a,b; a.set(10,20); b=a; b.show(); return 0; } The compilation gives the following error :- [root@dogmatix stackoverflow]# g++ prog4.cpp prog4.cpp:11: error: ‘comp operator=(comp&, const comp&)’ must be a nonstatic member function prog4.cpp:14: error: ‘comp operator=(comp&, const comp&)’ must be a nonstatic member function prog4.cpp: In function ‘int main()’: prog4.cpp:25: error: ambiguous overload for ‘operator=’ in ‘b = a’ prog4.cpp:4: note: candidates are: comp& comp::operator=(const comp&) prog4.cpp:14: note: comp operator=(comp&, const comp&)

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  • How to befriend a templated class's constructor?

    - by Kyle
    Why does class A; template<typename T> class B { private: A* a; public: B(); }; class A : public B<int> { private: friend B<int>::B<int>(); int x; }; template<typename T> B<T>::B() { a = new A; a->x = 5; } int main() { return 0; } result in ../src/main.cpp:15: error: invalid use of constructor as a template ../src/main.cpp:15: note: use ‘B::B’ instead of ‘B::class B’ to name the constructor in a qualified name yet changing friend B<int>::B<int>() to friend B<int>::B() results in ../src/main.cpp:15: error: no ‘void B::B()’ member function declared in class ‘B’ while removing the template completely class A; class B { private: A* a; public: B(); }; class A : public B { private: friend B::B(); int x; }; B::B() { a = new A; a->x = 5; } int main() { return 0; } compiles and executes just fine -- despite my IDE saying friend B::B() is invalid syntax?

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  • Getting a friend count from facebook (possibly using api)

    - by Patrick
    Im used to working with twitter, where friend/follower totals are available in a simple xml request. My goal is a simple "enter your username/user id, and display your friends count". Is there something like this for facebook? From what i gather, ill have to make an application, and have anyone who wants to grab their friends total actually install that app from within their own facebook profile. Anyone have any experience with this?

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  • Google Friend Connect ASP.NET

    - by Amit
    Hi, I am using the JS APIS for Google Friend Connect in my ASP.NET app. I am not able to run the application at all. If any body could please let me know how to get the FriendList and show it in ASP.NET page that will be great help. Thanks very much

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  • FB Developer: Capture POST variables after multi-friend-selector

    - by Faruz
    Using this: http://stackoverflow.com/questions/820421/can-i-use-facebooks-fbfriend-selector-in-an-iframe I created a multi-friend selector in my IFRAME FB application. I want to know if the user selected any users for invite so I can reward him with extra points. In the developer WIKI I saw that [ids] is transferred to requested page via POST. But how I can capture the values if I'm using JS/.NET? (Preferably through .NET so I can easily save values in the DB).

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  • iPhone facebook friend with email address

    - by rajeev87
    Hi all, How do I fetch the email of my friend programmatically in my facebook applicaiton. If facebook don't provide that functionality then can i provide the permission of my facebook application to get email address? If Yes then how? Please can you provide code me. Thanks

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  • Facebook FQL - How do I fetch the posts I made to a friend's wall

    - by simianarmy
    I have a facebook desktop app with some test users all having granted the stream_read & offline access permissions. I can easily retrieve posts to each users' stream & profile. What I cannot do easily is retrieve posts that a user has made to one of their friend's walls. In fact, this used to work with a rather complex multiquery, but has stopped working now, or is working only intermittently... Does anyone care to share their method if one exists or discuss what restrictions there might be to this type of complex querying?

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  • iphone facebook friend status.

    - by Syed Faraz Haider Zaidi
    NSMutableDictionary * params = [[NSMutableDictionary alloc] init]; [params setValue:@"100000********" forKey:@"uid"]; [params setValue:@"1500" forKey:@"limit"]; [params setValue:@"results" forKey:@"callback"]; when im using this coding im getting my friend status... but when im using a dynamic value like this : [params setValue:[NSString stringWithFormat:@"%@", a] forKey:@"uid"]; im getting this error The operation couldn’t be completed. (facebookErrDomain error 10000.) looking forward for your help guys....

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