Re: [Boost-users] Nesting bind with shared_ptr<T>::operator* and ref

4 Jun 2013

      AMDG

On 06/04/2013 10:36 AM, Chris Stankevitz wrote:
...
On Mon, Jun 3, 2013 at 5:33 PM, Steven Watanabe  wrote:
...
using boost::phoenix::bind;
using boost::phoenix::placeholders::_1;
bind(x, *bind(GetC, _1))
Steven,
Thank you, I did not know about phoenix's operator capability.
Do you agree with this statement:
GetC increments the shared_ptr's reference count when it returns a
shared_ptr to operator*.  After operator* dereferences, it decrements
the shared_ptr reference count.  Then the function "x" is executed.
Hence nobody is holding a reference count on behalf of function "x".
I think that's correct.  Boost.Phoenix doesn't
try to mimic built-in temporary lifetime rules.
I suppose you could get around it like this:

let(_a = bind(GetC, _1)) [ bind(x, _a) ]

In Christ,
Steven Watanabe