C++ .NET class member initialization

[Hans-Christian Stadler]

Hi,

I'm wondering how C++ .NET initializes class members. I have code that
looks aproximately like this:

_gc class SuperClass;

// Factory object creates instances
_gc class Factory {
public:
virtual SuperClass* createInstance( ) = 0;
};

// Common interface
_gc class SuperClass {
public:
// available class factories
static ArrayList *factories = new ArrayList();

static SuperClass* createInstance( int factory) {
return dynamic_cast<Fa ctory*>
(factories[factory])->createInstance ()
}

virtual void doSomething(voi d) = 0;
};

// Class implementating SuperClass interface
_gc class BaseClass : public SuperClass {
public:
virtual void doSomething(voi d) {
Console::WriteL ine(S"Hello");
}
};

// Factory object for BaseClass
_gc class BaseClassFactor y {
private:
static BaseClassFactor y *theInstance = new BaseClassFactor y();

BaseClassFactor y(void) {
SuperClass::fac tories->Add(this);
}
public:
virtual SuperClass* createInstance( ) {
return new BaseClass();
}
};

Client code would look like this:

SuperClass *sc = SuperClass::cre ateInstance(0);
sc->doSomething( );
The problem is, the BaseClassFactor y constructor is never executed!

Hans

[Ioannis Vranos]

"Hans-Christian Stadler" <no**@none.none > wrote in message
news:c5******** ***@news.cyberc ity.dk...

Hi,

I'm wondering how C++ .NET initializes class members. I have code that
looks aproximately like this:

_gc class SuperClass;

// Factory object creates instances
_gc class Factory {
public:
virtual SuperClass* createInstance( ) = 0;
};

// Common interface
_gc class SuperClass {
public:
// available class factories
static ArrayList *factories = new ArrayList();

What's this. Myself is using .NET i am not programming this way. Why the
call to default constructor (other than the MS manuals use this way).

static SuperClass* createInstance( int factory) {
return dynamic_cast<Fa ctory*>
(factories[factory])->createInstance ()
}

virtual void doSomething(voi d) = 0;
};

// Class implementating SuperClass interface
_gc class BaseClass : public SuperClass {
public:
virtual void doSomething(voi d) {
Console::WriteL ine(S"Hello");
}
};

// Factory object for BaseClass
_gc class BaseClassFactor y {
private:
static BaseClassFactor y *theInstance = new BaseClassFactor y();

BaseClassFactor y(void) {
SuperClass::fac tories->Add(this);
}
public:
virtual SuperClass* createInstance( ) {
return new BaseClass();
}
};

Client code would look like this:

SuperClass *sc = SuperClass::cre ateInstance(0);
sc->doSomething( );
The problem is, the BaseClassFactor y constructor is never executed!

The problem is that your code does not compile in VS .NET. Post a code that
compiles followed by your questions. Although .NET API is entirely off topic
in comp.lang.c++. Also try microsoft.publi c.dotnet.* newsgroups.


Ioannis Vranos