How to disable some base class method?

[Peter Lee]

class Base {
public:
void t1() {}
void t2() {}
void t3() {};

};
class Derived : public Base
{
public:

private:
using Base::t1;
using Base::t3;

};

Derived d;

d.t1(); // error, this is what I want
d.t3(); // error, this is what I want
d.Base::t1(); // ok <== I don't want user call method this way

my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?

[Ian Collins]

Peter Lee wrote:

class Base {
public:
void t1() {}
void t2() {}
void t3() {};

};
class Derived : public Base
{
public:

private:
using Base::t1;
using Base::t3;

};

Derived d;

d.t1(); // error, this is what I want
d.t3(); // error, this is what I want
d.Base::t1(); // ok <== I don't want user call method this way

my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?

There's nothing to stop them doing

Base& b(d);
b.t1();

why do you want to do this?

--
Ian Collins.

[Peter Lee]

Ian Collins ¼g¹D¡G

I just wanto to disable Derived object call t1(); and t3();

so this way is OK
Base& b(d);
b.t1();

somethimes I want to inherit Base class that has many method
but some Base class's method I don't want it ( the reason is maybe I
think those method is NOT good or NOT safe .. etc)

If I use the following way, it's waste time to copy and paste when Base
class has many method
But I just don't want some of them

class D
{
public:
void t2() { m_base.t2(); }

private:
Base m_base;
};

Peter Lee wrote:

class Base {
public:
void t1() {}
void t2() {}
void t3() {};

};
class Derived : public Base
{
public:

private:
using Base::t1;
using Base::t3;

};

Derived d;

d.t1(); // error, this is what I want
d.t3(); // error, this is what I want
d.Base::t1(); // ok <== I don't want user call method this way

my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?

There's nothing to stop them doing

Base& b(d);
b.t1();

why do you want to do this?

--
Ian Collins.

[Ian Collins]

Peter Lee wrote:

Ian Collins ¼g¹D¡G

Please don't top-post.

>>Peter Lee wrote:

>>>my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?

There's nothing to stop them doing

Base& b(d);
b.t1();

why do you want to do this?

I just wanto to disable Derived object call t1(); and t3();

so this way is OK
Base& b(d);
b.t1();

somethimes I want to inherit Base class that has many method
but some Base class's method I don't want it ( the reason is maybe I
think those method is NOT good or NOT safe .. etc)

If I use the following way, it's waste time to copy and paste when Base
class has many method
But I just don't want some of them

Sounds a bit of a design smell to me. If that's what you want, make
them private in Base and public in Derived.

--
Ian Collins.

[Peter Lee]

Ian Collins ¼g¹D¡G

Peter Lee wrote:

Ian Collins ¼g¹D¡G

Please don't top-post.

>Peter Lee wrote:

>>my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?
There's nothing to stop them doing

Base& b(d);
b.t1();

why do you want to do this?

I just wanto to disable Derived object call t1(); and t3();

so this way is OK
Base& b(d);
b.t1();

somethimes I want to inherit Base class that has many method
but some Base class's method I don't want it ( the reason is maybe I
think those method is NOT good or NOT safe .. etc)

If I use the following way, it's waste time to copy and paste when Base
class has many method
But I just don't want some of them

Sounds a bit of a design smell to me. If that's what you want, make
them private in Base and public in Derived.

--
Ian Collins.

Base class is not mine... it's maybe a system class framework...

[Ian Collins]

Peter Lee wrote:

Ian Collins ¼g¹D¡G

>>Peter Lee wrote:

>>>If I use the following way, it's waste time to copy and paste when Base
class has many method
But I just don't want some of them

Sounds a bit of a design smell to me. If that's what you want, make
them private in Base and public in Derived.

Base class is not mine... it's maybe a system class framework...

The make it a private base of Derived and expose the methods you want
through Derived.

--
Ian Collins.

[Grizlyk]

Peter Lee wrote:

d.t1(); // error, this is what I want
d.t3(); // error, this is what I want
d.Base::t1(); // ok <== I don't want user call method this way

my question:
I don't want user to call t1(); and t3(); from class Derived
Is there any way?

class Derived : protected Base
{
public:
using Base::t2;
};