member

In pre-C++11 code, if I'm looking for a member variable whose type I don't know, how can I use SFINAE to check if the member exists? Here's an example using Member detector idiom that you asked for: template<typename T> struct has_x { typedef char(&yes)[1]; typedef char(&no)[2]; // this creates an ambiguous &Derived::x if T has got member x struct Fallback { char x; }; struct Derived : T, Fallback { }; template<typename U, U> struct Check; template<typename U> static no test(Check<char Fallback::*, &U::x>*); template<typename U> static yes test(...); static const bool value = sizeof(test

How do I set_cookie with the username of the member that is logged in to my site? Thanks you can implement this by using the session middleware , make sure to enable it in your project. I recommend you to use django.contrib.auth to manage sessions though. It manages sessions in the database which is a lot safer than just saving the username in a cookie Here is an example of how to do it using middleware class UserCookieMiddleWare(object): """ Middleware to set user cookie If user is authenticated and there is no cookie, set the cookie, If the user is not authenticated and the cookie remains,

I have got two classes. The first class (A) is builded with an template. template <class T> class A { public: T value; }; The second class (B) should have an object of class A as member variable. Like this: class B { public: A<int> value; }; But now i want to use any kind of template-class in class A. Not only int . Apparent I can't declare a (member-)variable which contains any kind of a class. So, I need something like this: class B { public: A<*> value; }; Is there any (clean) solution for this problem? -- Greeting from Germany, Bastian You cannot have a single class B with "any" member

This question already has an answer here: problem sorting using member function as comparator 7 answers I have something like this: class Bar { public: pair<string,string> one; std::vector<string> cars; Bar(string one, string two, string car); }; class Car { public: string rz; Bar* owner; Car(string car, Bar* p); }; class Foo { public: Foo ( void ); ~Foo ( void ); int Count ( const string & one, const string & two) const; int comparator (const Bar & first, const Bar & second) const; std::vector<Bar> bars; }; int Foo::comparator(const Bar & first, const Bar & second) const{ return first.name <

I would like to iterate through members of any class in a referenced library much like is done using the Object Browser. How can this be done using VBA? Actually, how to do this is undocumented, but is possible. If your looking to implement a for..Each syntax for a collection, then you can do the following: Option Compare Database Option Explicit Public colT As New Collection Public Function NewEnum() As IUnknown Set NewEnum = colT.[_NewEnum] End Function Public Property Get NextItem() As IUnknown Attribute NextItem.VB_UserMemId = -4 Attribute NextItem.VB_MemberFlags = "40" Set NextItem = colT

I know it's possible to separate to create a pointer to member function like this struct K { void func() {} }; typedef void FuncType(); typedef FuncType K::* MemFuncType; MemFuncType pF = &K::func; Is there similar way to construct a pointer to a const function? I've tried adding const in various places with no success. I've played around with gcc some and if you do template deduction on something like template <typename Sig, typename Klass> void deduce(Sig Klass::*); It will show Sig with as a function signature with const just tacked on the end. If to do this in code it will complain that