Simple const-related question

[nsdevelop12@yahoo.com]

Is "const Object* pA = new Object(1)" the same as "const Object A(1)"
in terms of creating const objects that should not be modified through
cast-to-non-const pointers. See the following example:


const int* createInt()
{
return new int(1);
}

void myFunc( const int* const_param )
{
cout << "const_para m == " << *const_param << endl;

int *non_const_para m = const_cast<int* >( const_param );
*non_const_para m = 999;

cout << "const_para m == " << *const_param << endl;
}

int main(int argc, char* argv[])
{
int a = 1;
const int b = 1;
int* c = new int(1);
const int* d = new int(1);
const int* e = createInt();

myFunc( &a ); // ok
myFunc( &b ); // bad
myFunc( c ); // ok
myFunc( d ); // bad (?)
myFunc( e ); // bad (?)

return 0;
}

[nsdevelop12@yahoo.com]

Re: Simple const-related question

On Feb 18, 6:30 pm, nsdevelo...@yah oo.com wrote:

Is "const Object* pA = new Object(1)" the same as "const Object A(1)"
in terms of creating const objects that should not be modified through
cast-to-non-const pointers. See the following example:
>
const int* createInt()
{
return new int(1);
>
}
>
void myFunc( const int* const_param )
{
cout << "const_para m == " << *const_param << endl;
>
int *non_const_para m = const_cast<int* >( const_param );
*non_const_para m = 999;
>
cout << "const_para m == " << *const_param << endl;
>
}
>
int main(int argc, char* argv[])
{
int a = 1;
const int b = 1;
int* c = new int(1);
const int* d = new int(1);
const int* e = createInt();
>
myFunc( &a ); // ok
myFunc( &b ); // bad
myFunc( c ); // ok
myFunc( d ); // bad (?)
myFunc( e ); // bad (?)
>
return 0;
>
}

I guess my real question is what does "new int(1)" or "new MyObject()"
create - is it always non-const object, or does it depend on the
context as in the following:

MyObject *p1 = new MyObject(); // p1 is non-const
const MyObject *p2 = new MyObject(); // p2 is ???

What about:

MyObject* myFunction()
{
return new MyObject();
}

MyObject* p1 = myFunction(); // p1 is non-const
const MyObject *p2 = myFunction(); // p2 is ???