Implicit cast to bool of basic_istream/ifstream/ofstream doesn't work in Visual Studio 2013

Question

The code below compiles in VS 2012 but not in VS 2013

std::ofstream stm;
if(stm != NULL)
{
}

In VS 2013 you get this compilation error:

Answer 1

If you have a lot of legacy code, you could probably add a custom operator!= (and operator==) function which takes the correct arguments:

bool operator!=(std::basic_ios const& ios, const void* ptr);
bool operator!=(const void* ptr, std::basic_ios const& ios);