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

Subject: Re: [Boost-users] [intrusive_ptr] Strange ternary op behavior with MSVC14
From: TONGARI J (tongari95_at_[hidden])
Date: 2015-08-11 09:31:56

2015-08-11 17:39 GMT+08:00 Stephan Bergmann <sbergman_at_[hidden]>:

> 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.