Use of NULL pointer: reinterpret_cast<Foo*>(0)->foo();

[Alex Vinokur]

struct Foo
{
void foo()
{
// No data members used
}
};

Is this statment correct?
reinterpret_cast<Foo*>(0)->foo();

Alex Vinoku

 

[Ian Collins]

struct Foo
{
void foo()
{
// No data members used
}
};

Is this statment correct?
reinterpret_cast<Foo*>(0)->foo();

It's safe on many implementations but it isn't correct.

 

[Bo Persson]

struct Foo
{
void foo()
{
// No data members used
}
};

Is this statment correct?
reinterpret_cast<Foo*>(0)->foo();

No, it is undefined behavior to use a null pointer.

Some hardware will likely catch the error, some will not.


Bo Persson

 

[Ron]

No, it is undefined behavior to use a null pointer.

Some hardware will likely catch the error, some will not.

Besides, if "no data members are used" why don't you just
make the foo() function a static member. Then you don't
need a pointer (null or otherwise) to call it?