Member to pointer as template argument

[LionAM]

Hello, is there a convenient way to pass a pointer to a data member so that it is recognized as a template argument? The following does not compile under VC++ 2008:

template
void AddMember(Type Parent::*Member)
{
return true;
}

...

AddMember(&TestObject::i);
//error C2783: could not deduce template argument "Member"

Alex

[Albert Holguin]

Not completely sure... but did you try just this:

void AddMember(Type *Member)

If you're calling a method for it, no need to specify Parent::*Member, where the pointer comes from is up to the caller.

[_Superman_]

Try this -

template<class Parent, typename Type>
void AddMember(Type Parent::*Member)
{
return true;
}

«_Superman_»  _I love work. It gives me something to do between weekends.

_Microsoft MVP (Visual C++)

Polymorphism in C

[LionAM]

Thank you for your answers. Please look at this example:

struct TestObject
{
int i;
};

template
void test() {}

...

test<&TestObject::i>();

This way, I can call the function template so that the member pointer is passed as a (non-type) template argument. However, in my case, I would like that parent and type are template parameters, too:

struct TestObject
{
int i;
};

template
void test() {}

...

test();

However, this is not very convenient to call test() as you have to specify all template arguments manually. If you pass &TestObj::i as a argument to the function, Parent and Type are deduced - but not the Member... Alex

[_Superman_]

I understand that you want the parent and type to be template parameters. So let me repeat my earlier code snippet -

template<class Parent, typename Type>
void AddMember(Type Parent::*Member)
{
return true;
}

Here Parent and Type are template parameters and the calling is also convenient - AddMember(&TestObject::i); Here Parent will be deduced to TestObject and Type will be deduced to int. And Member will point to i. I think this is as convenient as it can get.

«_Superman_»  _I love work. It gives me something to do between weekends.

_Microsoft MVP (Visual C++)

Polymorphism in C