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#include <boost/interprocess/smart_ptr/unique_ptr.hpp>
using namespace boost::interprocess;
 
struct poly_deleter
{
    template<typename T>
	void operator()(T *p)
	{
		delete p;
	}
};
 
typedef unique_ptr<int, poly_deleter> u_ptr;
 
u_ptr func()
{
	return u_ptr();
}
 
int main()
{
	u_ptr u;
	u = func();
}
 

prog.cpp: In function ‘int main()’:
prog.cpp:23: error: ambiguous overload for ‘operator=’ in ‘u = func()()’
/usr/include/boost/interprocess/smart_ptr/unique_ptr.hpp:212: note: candidates are: boost::interprocess::unique_ptr<T, D>& boost::interprocess::unique_ptr<T, D>::operator=(boost::interprocess::rv<boost::interprocess::unique_ptr<T, D> >&) [with T = int, D = poly_deleter]
/usr/include/boost/interprocess/smart_ptr/unique_ptr.hpp:250: note:                 boost::interprocess::unique_ptr<T, D>& boost::interprocess::unique_ptr<T, D>::operator=(int boost::interprocess::unique_ptr<T, D>::nat::*) [with T = int, D = poly_deleter]

Standard output is empty