Compiler output compiling unique_ptr_fail1.cpp

gistfile1.txt

$ g++ -std=c++11 -g -fPIC ptr.cpp -o ptr
ptr.cpp: In constructor ‘A::A(std::unique_ptr<int>)’:
ptr.cpp:6:44: 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>]’
In file included from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from ptr.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:256:7: error: declared here
ptr.cpp: In function ‘int main(int, char**)’:
ptr.cpp:14:12: 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>]’
In file included from /usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/memory:86:0,
                 from ptr.cpp:1:
/usr/lib/gcc/x86_64-redhat-linux/4.7.0/../../../../include/c++/4.7.0/bits/unique_ptr.h:256:7: error: declared here
ptr.cpp:6:5: error:   initializing argument 1 of ‘A::A(std::unique_ptr<int>)’