2 files changed, 109 insertions, 5 deletions

diff --git a/src/sptr.h b/src/sptr.h
index 0ea8bca..9a6a2d6 100644
--- a/src/sptr.h
+++ b/src/sptr.h
@@ -40,7 +40,7 @@ public:
                 (*pRefCnt) = 1;
         }
 
-        int32_t count()
+        int32_t count() const
         {
                 return *pRefCnt;
         }
@@ -65,7 +65,17 @@ public:
                 return *this;
         }
 
-        bool operator==( const SPtr<T> &src )
+        const SPtr<T> operator=( const SPtr<T> &src ) const
+        {
+                decCount();
+                pRefCnt = src.pRefCnt;
+                pData = src.pData;
+                (*pRefCnt) += 1;
+
+                return *this;
+        }
+
+        bool operator==( const SPtr<T> &src ) const
         {
                 return pData == src.pData;
         }
@@ -81,7 +91,7 @@ public:
         }
 
 private:
-        void decCount()
+        void decCount() const
         {
                 if( pRefCnt )
                 {
@@ -97,8 +107,8 @@ private:
                 }
         }
 
-        int32_t *pRefCnt;
-        T *pData;
+        mutable int32_t *pRefCnt;
+        mutable T *pData;
 };
 
 template< typename Tb, typename Ta > SPtr<Tb> SPtrCast( SPtr<Ta> src )
diff --git a/src/tests/constsptr.cpp b/src/tests/constsptr.cpp
new file mode 100644
index 0000000..e6f87c7
--- /dev/null
+++ b/src/tests/constsptr.cpp
@@ -0,0 +1,94 @@
+#include <stdio.h>
+#include "sptr.h"
+
+template <typename T>
+class DataBase
+{
+public:
+        DataBase():
+                _bHas(false)
+        {
+        }
+        
+        virtual ~DataBase()
+        {
+                clr();
+        }
+        
+        virtual bool has() const
+        {
+                return _bHas;
+        }
+        
+        virtual void clr()
+        {
+                _bHas = false;
+        }
+
+        virtual void set(T d)
+        {
+                _tVal = d;
+                _bHas = true;
+        }
+
+        virtual T const &get() const
+        {
+                if(!has())
+                        throw "no data";
+                return _tVal;
+        }
+
+        virtual T &get()
+        {
+                if(!has())
+                        throw "no data";
+                return _tVal;
+        }
+        
+protected:
+        bool _bHas;
+        T _tVal;
+};
+
+
+class Test
+{
+public:
+        Test(){};
+        virtual ~Test(){};
+
+        void set(int i)
+        {
+                _i = i;
+        }
+        
+        int get() const
+        {
+                return _i;
+        }
+        
+private:
+        int _i;
+};
+
+int main()
+{
+        typedef SPtr<Test> TestPtr;
+
+        TestPtr t1(new Test);
+        t1->set(42);
+
+        printf("t1: %d.\n", t1->get());
+
+        const TestPtr t2 = t1;
+
+        printf("t2: %d.\n", t2->get());
+
+        typedef DataBase<const TestPtr> DBTP;
+
+        DBTP db;
+        db.set(t1);
+
+        printf("dbt1: %d.\n", db.get()->get());
+}
+