Loïc Joly wrote:
Hello everybody,
In boost::shared_ptr, there is a trick to get a type convertible to bool that is not a bool... unspecified_bool_type is a function pointer.
However, with MSVC8.0, and at least when I compile with /clr, I seem to have some problem with it : The null fct ptr seems to be coded 0xffffffff. That is just fine in non /clr compilation, where it gets evaluated as false when converted in boolean. But in /clr mode, it is converted to true.
I can't reproduce this problem with the following code: #include <boost/shared_ptr.hpp> #include <iostream> int main() { boost::shared_ptr<int> px; std::cout << ( px? true: false ) << std::endl; } compiled as /clr. The compiler does seem to encode a NULL member pointer as -1, but the example prints 0, as it should.