[Monotone-devel] pointer arithmetics in C++

[Markus Schiltknecht]

Hi,

I know, I know, it's evil. I want to do some pointer arithmetics 
anyway... I need to build a hash or digest or something from three 
'unsigned int' values and a pointer.

The simplest thing I came up with is XORing all four values. But I've 
had a hard time convincing the compiler to do what I wanted...

I came up with that (simplified):

int
get_digest(int foo, shared_ptr<struct bar> baz)
{
        return foo | *reinterpret_cast<int*>(b.get())
}

Is reinterpret_cast right here? What does that mean? Where can I find 
documentation about all the different _cast methods? Should I use a 
by-reference argument, i.e.:

int
get_digest(int foo, shared_ptr<struct bar> & const baz)
....

Help greatly appreciated.

Regards

Markus