Re: [Boost-users] [intrusive_ptr] Strange ternary op behavior with MSVC14

11 Aug 2015


      2015-08-11 17:39 GMT+08:00 Stephan Bergmann :
...
On 08/11/2015 10:27 AM, TONGARI J wrote:
...
template<class T>
struct wrapper
{
     wrapper() = default;
wrapper(boost::intrusive_ptr<T> const& p) : _p(p) {}
boost::intrusive_ptr<T> const& get_ptr() const
     {
#if 0
         // This is OK.
         if (_p)
             return _p;
         return nullptr;
#else
         // Strange behavior.
         return _p ? _p : nullptr;
#endif
     }
In both cases, you return a reference to a temporary, incurring undefined
behavior.
Ah damn! You're right, how could I overlook the const& part!?
Sorry for the noise.