fork(1) download

copy

#include <memory>
class A; // fwd declaration
 
class AUser
{
  std::unique_ptr<A> m_a;
};
 
int main() {
	AUser a;
	return 0;
}

In file included from /usr/include/c++/4.8/memory:81:0,
                 from prog.cpp:1:
/usr/include/c++/4.8/bits/unique_ptr.h: In instantiation of ‘void std::default_delete<_Tp>::operator()(_Tp*) const [with _Tp = A]’:
/usr/include/c++/4.8/bits/unique_ptr.h:184:16:   required from ‘std::unique_ptr<_Tp, _Dp>::~unique_ptr() [with _Tp = A; _Dp = std::default_delete<A>]’
prog.cpp:4:7:   required from here
/usr/include/c++/4.8/bits/unique_ptr.h:65:22: error: invalid application of ‘sizeof’ to incomplete type ‘A’
  static_assert(sizeof(_Tp)>0,
                      ^

Standard output is empty