Experimental smart pointer support.

Cython/Includes/libcpp/memory.pxd

+from libcpp cimport bool
+    
+cdef extern from "<memory>" namespace "std" nogil:
+    ctypedef void* nullptr_t; # Should be decltype(nullptr)
+    
+    cdef cppclass unique_ptr[T]:
+        unique_ptr()
+        unique_ptr(nullptr_t)
+        unique_ptr(T*)
+        unique_ptr(unique_ptr[T]&)
+        
+        # Modifiers
+        T* release()
+        void reset()
+        void reset(nullptr_t)
+        void reset(T*)
+        void swap(unique_ptr&)
+        
+        # Observers
+        T* get()
+        T& operator*()
+        #T* operator->() # Not Supported
+        #bool operator bool() # Not Supported
+        
+        bool operator==(const unique_ptr&)
+        bool operator!=(const unique_ptr&)
+        bool operator<(const unique_ptr&)
+        bool operator>(const unique_ptr&)
+        bool operator<=(const unique_ptr&)
+        bool operator>=(const unique_ptr&)
+        
+        bool operator==(nullptr_t)
+        bool operator!=(nullptr_t)
+    
+    # Forward Declaration not working ("Compiler crash in AnalyseDeclarationsTransform")
+    #cdef cppclass weak_ptr[T]
+    
+    cdef cppclass shared_ptr[T]:
+        shared_ptr()
+        shared_ptr(nullptr_t)
+        shared_ptr(T*)
+        shared_ptr(shared_ptr[T]&)
+        shared_ptr(shared_ptr[T]&, T*)
+        shared_ptr(unique_ptr[T]&)
+        #shared_ptr(weak_ptr[T]&) # Not Supported
+        
+        # Modifiers
+        void reset()
+        void reset(T*)
+        void swap(shared_ptr&)
+        
+        # Observers
+        T* get()
+        T& operator*()
+        #T* operator->() # Not Supported
+        long use_count()
+        bool unique()
+        #bool operator bool() # Not Supported
+        #bool owner_before[Y](const weak_ptr[Y]&) # Not Supported
+        bool owner_before[Y](const shared_ptr[Y]&)
+        
+        bool operator==(const shared_ptr&)
+        bool operator!=(const shared_ptr&)
+        bool operator<(const shared_ptr&)
+        bool operator>(const shared_ptr&)
+        bool operator<=(const shared_ptr&)
+        bool operator>=(const shared_ptr&)
+        
+        bool operator==(nullptr_t)
+        bool operator!=(nullptr_t)
+    
+    cdef cppclass weak_ptr[T]:
+        weak_ptr()
+        weak_ptr(weak_ptr[T]&)
+        weak_ptr(shared_ptr[T]&)
+        
+        # Modifiers
+        void reset()
+        void swap(weak_ptr&)
+        
+        # Observers
+        long use_count()
+        bool expired()
+        shared_ptr[T] lock()
+        bool owner_before[Y](const weak_ptr[Y]&)
+        bool owner_before[Y](const shared_ptr[Y]&)
+    
+    
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