const..ant problems

[Gernot Frisch]

Hi,

assume:

MyClass mc;
const MyClass& Rmc = mc;

mc->GetPtr()->AlterData();
Rmc->GetPtr()->ReadData(); // Here's the error

now: I have defines MyClass as:

class MyClass
{
public:
MyClass() {};
MyClass* GetPtr() {return this;}
const MyClass* GetPtr() const {return this;}

void AlterData() {}
void ReadData() const {}
};

However, this does not work.

Error C2440: 'const class MyClass*' cannot be converted to 'class
MyClass *'

What did I do wrong? Is the compiler always using the first one? Do I
have to use 2 function names?

--
-Gernot
int main(int argc, char** argv) {printf
("%silto%c%cf%cgl%ssic%ccom%c", "ma", 58, 'g', 64, "ba", 46, 10);}

________________________________________
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[Gernot Frisch]

Hi,

assume:

MyClass mc;
const MyClass& Rmc = mc;

mc->GetPtr()->AlterData();
Rmc->GetPtr()->ReadData(); // Here's the error

now: I have defines MyClass as:

class MyClass
{
public:
MyClass() {};
MyClass* GetPtr() {return this;}
const MyClass* GetPtr() const {return this;}

void AlterData() {}
void ReadData() const {}
};

However, this does not work.

Error C2440: 'const class MyClass*' cannot be converted to 'class
MyClass *'

What did I do wrong? Is the compiler always using the first one? Do
I have to use 2 function names?

Doh! The error was there:
MyClass* pC = Rmc->GetPtr();


I've not done much with const, so I got confused by the error, sorry
for wasting your time.

 

[Ioannis Vranos]

Hi,

assume:

MyClass mc;
const MyClass& Rmc = mc;

mc->GetPtr()->AlterData();
Rmc->GetPtr()->ReadData(); // Here's the error

now: I have defines MyClass as:

class MyClass
{
public:
MyClass() {};
MyClass* GetPtr() {return this;}
const MyClass* GetPtr() const {return this;}

void AlterData() {}
void ReadData() const {}
};

However, this does not work.

Error C2440: 'const class MyClass*' cannot be converted to 'class
MyClass *'

What did I do wrong? Is the compiler always using the first one? Do I
have to use 2 function names?

mc.GetPtr()->AlterData();
Rmc.GetPtr()->ReadData();