error C2440: 'type cast' : cannot convert from 'std::stringstream' to 'void *'

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Hello,

I don't understand why I cannot do the following with vs7:

-----------------------------------
#include <iostream>
#include <sstream>

int main ()
{
std::stringstream ss;
if ( (void*)ss == 0) {
std::cerr << "zero\n";
}
return 0;
}
-----------------------------------

The compiler is returning:

ss.cxx(7) : error C2440: 'type cast' : cannot convert from
'std::stringstream' to 'void *'
Ambiguous user-defined-conversion

But stringstream should inherit this from its parent ios, right ?

http://cplusplus.com/ref/iostream/ios/operatorvoidpt.html

Thanks
Mathieu

.

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