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#include <iostream>
#include <memory>
 
 
class badass {
	std::unique_ptr<int> ptr;
public:
	badass(std::unique_ptr<int>&& ptr) : ptr(ptr) {}
};
 
 
int main()
{
	badass dawg(std::make_unique<int>(2));
}

prog.cpp: In constructor ‘badass::badass(std::unique_ptr<int>&&)’:
prog.cpp:8:46: error: use of deleted function ‘std::unique_ptr<_Tp, _Dp>::unique_ptr(const std::unique_ptr<_Tp, _Dp>&) [with _Tp = int; _Dp = std::default_delete<int>]’
  badass(std::unique_ptr<int>&& ptr) : ptr(ptr) {}
                                              ^
In file included from /usr/include/c++/6/memory:81:0,
                 from prog.cpp:2:
/usr/include/c++/6/bits/unique_ptr.h:359:7: note: declared here
       unique_ptr(const unique_ptr&) = delete;
       ^~~~~~~~~~

Standard output is empty