polymorphic use problem

[Angus]

If I have these classes:
class TBase
{
public:
virtual int Execute(Server* srv) = 0;
virtual ~TFunction() {}
};

class Derived : public TBase
{
public:
Derived(const std::string& strA, int ia1)
: m_strA(strA), m_ia1(ia1){
}

virtual int Execute(TServer srv)
{
return SomeFunction(srv, m_strA, m_ia1);
}
~TRegister() { }
private:
std::string m_strA;
int m_ia1;
};
I want to call the Execute function on a Derived object. How can I
call it?

[Joe Greer]

Angus <an*********@gmail.comwrote in news:67a176cb-5052-45d3-9dc4-
6b**********@27g2000hsf.googlegroups.com:

If I have these classes:
class TBase
{
public:
virtual int Execute(Server* srv) = 0;
virtual ~TFunction() {}
};

class Derived : public TBase
{
public:
Derived(const std::string& strA, int ia1)
: m_strA(strA), m_ia1(ia1){
}

virtual int Execute(TServer srv)
{
return SomeFunction(srv, m_strA, m_ia1);
}
~TRegister() { }
private:
std::string m_strA;
int m_ia1;
};
I want to call the Execute function on a Derived object. How can I
call it?

Derived d("blah", 5);

TServer s;
d.Execute(s);

joe

[Joe Greer]

Angus <an*********@gmail.comwrote in news:67a176cb-5052-45d3-9dc4-
6b**********@27g2000hsf.googlegroups.com:

If I have these classes:
class TBase
{
public:
virtual int Execute(Server* srv) = 0;
virtual ~TFunction() {}
};

class Derived : public TBase
{
public:
Derived(const std::string& strA, int ia1)
: m_strA(strA), m_ia1(ia1){
}

virtual int Execute(TServer srv)
{
return SomeFunction(srv, m_strA, m_ia1);
}
~TRegister() { }
private:
std::string m_strA;
int m_ia1;
};
I want to call the Execute function on a Derived object. How can I
call it?

I have to point out that as written this won't compile because int
Execute(Server *) isn't implemented any where (unless TServer is a
typedef for a Server *). However, assuming you meant them to be the
same...

If you had:

void f(TBase & t)
{
Server s;
t.Execute(&s);
}
..
..
..

int main()
{
Derived d("blah", 4);

f(d);
}
Is that what you have in mind? Or was it more like:

void f(TBase * t)
{
Server s;
t->Execute(&s);
}

int main()
{
Derived d("blah", 3);
TBase * pT = &d;

f(pT);
}

Either way works. Polymorphism requires a pointer or reference at some
point or you aren't really polymorphic.

joe

[red floyd]

On Jul 10, 9:55*am, Joe Greer <[e-mail]:

Angus <[e-mail] in news:67a176cb-5052-45d3-9dc4-
[e-mail]:

If I have these classes:

class TBase
{
public:
* * virtual int Execute(Server* srv) = 0;
* * virtual ~TFunction() {}
};

class Derived : public TBase
{
public:
* * Derived(const std::string& strA, int ia1)
* * : m_strA(strA), m_ia1(ia1){
* * }

* * virtual int Execute(TServer srv)
* * {
* * * * return SomeFunction(srv, m_strA, m_ia1);
* * }
* * ~TRegister() { }
private:
* * std::string m_strA;
* * int m_ia1;
};

I want to call the Execute function on a Derived object. *How can I
call it?

I have to point out that as written this won't compile because int
Execute(Server *) isn't implemented any where (unless TServer is a
typedef for a Server *). *However, assuming you meant them to be the
same...

I also have to point out that these won't compile because the
destructors are improperly named.

[Joe Greer]

red floyd <re******@gmail.comwrote in news:11d9e89e-6410-44ad-9675-
db**********@m36g2000hse.googlegroups.com:

On Jul 10, 9:55*am, Joe Greer <[e-mail]:

>I have to point out that as written this won't compile because int
Execute(Server *) isn't implemented any where (unless TServer is a
typedef for a Server *). *However, assuming you meant them to be the
same...

I also have to point out that these won't compile because the
destructors are improperly named.

There is that too. :)

joe