[unique_ptr] How should I assign unique_ptr returned from a factory function, possibly using boost::move, in C++03

26 Oct 2012

      Hi,

the question is: how should I assign boost::interprocess::unique_ptr 
returned from a factory function, possibly using boost::move, in C++03?

Here's an example:

---
#include <boost/interprocess/smart_ptr/unique_ptr.hpp>
using namespace boost::interprocess;

class my_class {
public:
     my_class() {}
};

struct my_class_deleter {
     void operator()(my_class *p) {}
};

typedef unique_ptr<my_class, my_class_deleter> uptr;

uptr create() {
     return uptr();
}

int main() {
     uptr x;
     x = create();

//

     return 0;
}
---

The problem is that gcc fails to compile the above code saying:

main.cpp:22: error: ambiguous overload for ‘operator=’ in ‘x = create()()’
../../boost_latest/boost/interprocess/smart_ptr/unique_ptr.hpp:211: 
note: candidates are: boost::interprocess::unique_ptr<T, D>& 
boost::interprocess::unique_ptr<T, 
D>::operator=(boost::rv<boost::interprocess::unique_ptr<T, D> >&) [with 
T = my_class, D = my_class_deleter]
../../boost_latest/boost/interprocess/smart_ptr/unique_ptr.hpp:249: 
note:                 boost::interprocess::unique_ptr<T, D>& 
boost::interprocess::unique_ptr<T, D>::operator=(int 
boost::interprocess::unique_ptr<T, D>::nat::*) [with T = my_class, D = 
my_class_deleter]

I use gcc v4.4.3 and Boost v1.51.0.

BTW: I posted the same question on StackOverflow: 
http://stackoverflow.com/questions/13086428/how-should-i-assign-boostinterpr...

Adam Romanek

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