RFC: getting a unique integer value

[Matti Picus]

Generating a unique int ID seems to be faulty in many places in AbiWord. 
The general method is to use the result from UT_rand() and hope that it is 
unique.  I recently modified the RTF importer with a different method: 
using a static member variable.

I hope the construct is portable to all platforms.

Here is what it looks like:
-------- NeedToIncrement.h-----------------
class NeedToIncrement
{
        static UT_uint32 m_incrementer;
        UT_uint32 m_ID;
}
-----------------------------------------

--------NeedToIncrement.cpp---------------
NeedToImcrement::NeedToIncrement()
{
        m_ID = m_incrementer++;
}
// Static data members must be initialized at file scope.
UT_uint32 NeedToImcrement::m_incrementer = 100;
-------------------------------------------

Any comments?
Matti