From e19acafd485a1c6a027bc967945d914fa5ed38b9 Mon Sep 17 00:00:00 2001
From: Mike Buland <eichlan@xagasoft.com>
Date: Fri, 24 Nov 2006 10:40:34 +0000
Subject: Added a simple smart-pointer.  It deletes what's in it automatically
 and does ref-counting.  You just have to be careful to not hand it an
 array...

---
 src/sptr.cpp       |  1 +
 src/sptr.h         | 85 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 src/tests/sptr.cpp | 55 +++++++++++++++++++++++++++++++++++
 3 files changed, 141 insertions(+)
 create mode 100644 src/sptr.cpp
 create mode 100644 src/sptr.h
 create mode 100644 src/tests/sptr.cpp

diff --git a/src/sptr.cpp b/src/sptr.cpp
new file mode 100644
index 0000000..7f5e894
--- /dev/null
+++ b/src/sptr.cpp
@@ -0,0 +1 @@
+#include "sptr.h"
diff --git a/src/sptr.h b/src/sptr.h
new file mode 100644
index 0000000..c711a89
--- /dev/null
+++ b/src/sptr.h
@@ -0,0 +1,85 @@
+#ifndef SPTR_H
+#define SPTR_H
+
+#include <stdint.h>
+#include <stdio.h>
+
+template<typename T>
+class SPtr
+{
+public:
+	SPtr() :
+		pRefCnt( NULL ),
+		pData( NULL )
+	{
+	}
+
+	~SPtr()
+	{
+		decCount();
+	}
+
+	SPtr( SPtr<T> &src ) :
+		pRefCnt( src.pRefCnt ),
+		pData( src.pData )
+	{
+		(*pRefCnt) += 1;
+	}
+
+	SPtr( T *pSrc ) :
+		pRefCnt( NULL ),
+		pData( pSrc )
+	{
+		pRefCnt = new uint32_t;
+		(*pRefCnt) = 1;
+	}
+
+	uint32_t count()
+	{
+		return *pRefCnt;
+	}
+
+	T *operator->() const
+	{
+		return pData;
+	}
+
+	T *operator*() const
+	{
+		return pData;
+	}
+
+	SPtr<T> operator=( const SPtr<T> &src )
+	{
+		decCount();
+		pRefCnt = src.pRefCnt;
+		pData = src.pData;
+		(*pRefCnt) += 1;
+	}
+
+	bool operator==( const SPtr<T> &src )
+	{
+		return pData == src.pData;
+	}
+
+private:
+	void decCount()
+	{
+		if( pRefCnt )
+		{
+			(*pRefCnt) -= 1;
+			if( (*pRefCnt) == 0 )
+			{
+				delete pRefCnt;
+				delete pData;
+				pRefCnt = NULL;
+				pData = NULL;
+			}
+		}
+	}
+
+	uint32_t *pRefCnt;
+	T *pData;
+};
+
+#endif
diff --git a/src/tests/sptr.cpp b/src/tests/sptr.cpp
new file mode 100644
index 0000000..38d3675
--- /dev/null
+++ b/src/tests/sptr.cpp
@@ -0,0 +1,55 @@
+#include <stdio.h>
+#include "sptr.h"
+
+class Annoy
+{
+public:
+	Annoy() : nCnt( 0 )
+	{
+		printf("Created.\n");
+	}
+
+	~Annoy()
+	{
+		printf("Destroyed.\n");
+	}
+
+	void go()
+	{
+		printf("%d: I'm annoying.\n", ++nCnt);
+	}
+
+	int nCnt;
+};
+
+void beAnnoying( SPtr<Annoy> bob )
+{
+	printf("bob-Count: %d\n", bob.count() );
+	bob->go();
+}
+
+int main()
+{
+	SPtr<Annoy> pt( new Annoy );
+	printf("Count: %d\n", pt.count() );
+	pt->go();
+
+	{
+		SPtr<Annoy> pt2 = pt;
+		printf("Count: %d\n", pt2.count() );
+
+		pt2->go();
+
+		{
+			SPtr<Annoy> pt3( pt2 );
+			printf("Count: %d\n", pt3.count() );
+
+			pt3->go();
+
+			beAnnoying( pt3 );
+		}
+		printf("Count: %d\n", pt.count() );
+	}
+	printf("Count: %d\n", pt.count() );
+}
+
-- 
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