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template<typename T>
class out
{
    T* _p;
    std::shared_ptr<T>& _sp;
public:
    out(std::shared_ptr<T>& sp) : _p(nullptr) , _sp(sp) {}
    ~out() { _sp.reset(_p); }
    T** operator&() { _ASSERT(nullptr == _p); return &_p; }
};
 
template <class T>
out<T> make_out(std::shared_ptr<T> ptr)
{
	return (out<T>(ptr));
}

prog.cpp:5:10: error: 'shared_ptr' in namespace 'std' does not name a template type
     std::shared_ptr<T>& _sp;
          ^
prog.cpp:7:24: error: expected ')' before '<' token
     out(std::shared_ptr<T>& sp) : _p(nullptr) , _sp(sp) {}
                        ^
prog.cpp: In destructor 'out<T>::~out()':
prog.cpp:8:14: error: '_sp' was not declared in this scope
     ~out() { _sp.reset(_p); }
              ^
prog.cpp: At global scope:
prog.cpp:13:22: error: template declaration of 'out<T> make_out'
 out<T> make_out(std::shared_ptr<T> ptr)
                      ^
prog.cpp:13:17: error: 'shared_ptr' is not a member of 'std'
 out<T> make_out(std::shared_ptr<T> ptr)
                 ^
prog.cpp:13:34: error: expected primary-expression before '>' token
 out<T> make_out(std::shared_ptr<T> ptr)
                                  ^
prog.cpp:13:36: error: 'ptr' was not declared in this scope
 out<T> make_out(std::shared_ptr<T> ptr)
                                    ^

Standard output is empty