From 531761d77331915b3e6495d10e03191ba10c04d2 Mon Sep 17 00:00:00 2001
From: David <david@xagasoft.com>
Date: Tue, 10 Apr 2007 00:26:26 +0000
Subject: david - wow... that seems a little kludgy... see the constsptr test
 for details, but basically i had to make the members of sptr mutable to get
 this to work the way it seems it should... maybe i'm missing something...

---
 src/sptr.h              | 20 ++++++++---
 src/tests/constsptr.cpp | 94 +++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 109 insertions(+), 5 deletions(-)
 create mode 100644 src/tests/constsptr.cpp

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());
+}
+
-- 
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