From d8c41ef38f31a6d4e1f1548b5305099781447040 Mon Sep 17 00:00:00 2001
From: Ingo Weinhold <ingo_weinhold@gmx.de>
Date: Sat, 25 Jul 2009 00:20:53 +0000
Subject: [PATCH] Added support for containing BReferenceables of arbitrary
 actual type.

git-svn-id: file:///srv/svn/repos/haiku/haiku/trunk@31744 a95241bf-73f2-0310-859d-f6bbb57e9c96
---
 headers/private/shared/Variant.h | 27 +++++++++++++++++++++++++--
 src/kits/shared/Variant.cpp      | 19 +++++++++++++++++++
 2 files changed, 44 insertions(+), 2 deletions(-)

diff --git a/headers/private/shared/Variant.h b/headers/private/shared/Variant.h
index 93904972a3..0a1fb80315 100644
--- a/headers/private/shared/Variant.h
+++ b/headers/private/shared/Variant.h
@@ -9,10 +9,13 @@
 #include <SupportDefs.h>
 #include <TypeConstants.h>
 
+#include <Referenceable.h>
+
 
 enum {
-	B_VARIANT_DONT_COPY_DATA	= 0x01,
-	B_VARIANT_OWNS_DATA			= 0x02
+	B_VARIANT_DONT_COPY_DATA		= 0x01,
+	B_VARIANT_OWNS_DATA				= 0x02,
+	B_VARIANT_REFERENCEABLE_DATA	= 0x04
 };
 
 
@@ -33,6 +36,8 @@ public:
 	inline						BVariant(const void* value);
 	inline						BVariant(const char* value,
 									uint32 flags = 0);
+	inline						BVariant(BReferenceable* value, type_code type);
+									// type must be a custom type
 	inline						BVariant(const BVariant& other);
 								~BVariant();
 
@@ -51,6 +56,8 @@ public:
 	inline	void				SetTo(const void* value);
 	inline	void				SetTo(const char* value,
 									uint32 flags = 0);
+	inline	void				SetTo(BReferenceable* value, type_code type);
+									// type must be a custom type
 			status_t			SetToTypedData(const void* data,
 									type_code type);
 			void				Unset();
@@ -102,6 +109,7 @@ private:
 			void				_SetTo(const void* value);
 			bool				_SetTo(const char* value,
 									uint32 flags);
+			void				_SetTo(BReferenceable* value, type_code type);
 
 	template<typename NumberType>
 	inline	NumberType			_ToNumber() const;
@@ -123,6 +131,7 @@ private:
 				double			fDouble;
 				void*			fPointer;
 				char*			fString;
+				BReferenceable*	fReferenceable;
 				uint8			fBytes[8];
 			};
 };
@@ -214,6 +223,12 @@ BVariant::BVariant(const char* value, uint32 flags)
 }
 
 
+BVariant::BVariant(BReferenceable* value, type_code type)
+{
+	_SetTo(value, type);
+}
+
+
 BVariant::BVariant(const BVariant& other)
 {
 	_SetTo(other);
@@ -341,4 +356,12 @@ BVariant::SetTo(const char* value, uint32 flags)
 }
 
 
+void
+BVariant::SetTo(BReferenceable* value, type_code type)
+{
+	Unset();
+	_SetTo(value, type);
+}
+
+
 #endif	// _VARIANT_H
diff --git a/src/kits/shared/Variant.cpp b/src/kits/shared/Variant.cpp
index 3855a208be..980de5b6d7 100644
--- a/src/kits/shared/Variant.cpp
+++ b/src/kits/shared/Variant.cpp
@@ -115,6 +115,9 @@ BVariant::Unset()
 			default:
 				break;
 		}
+	} else if ((fFlags & B_VARIANT_REFERENCEABLE_DATA) != 0) {
+		if (fReferenceable != NULL)
+			fReferenceable->ReleaseReference();
 	}
 
 	fType = 0;
@@ -127,6 +130,8 @@ BVariant::Size() const
 {
 	if (fType == B_STRING_TYPE)
 		return fString != NULL ? strlen(fString) + 1 : 0;
+	if ((fFlags & B_VARIANT_REFERENCEABLE_DATA) != 0)
+		return sizeof(this->fReferenceable);
 	return SizeOfType(fType);
 }
 
@@ -329,6 +334,9 @@ BVariant::_SetTo(const BVariant& other)
 			default:
 				break;
 		}
+	} else if ((other.fFlags & B_VARIANT_REFERENCEABLE_DATA) != 0) {
+		if (other.fReferenceable != NULL)
+			fReferenceable->AcquireReference();
 	}
 
 	memcpy(this, &other, sizeof(BVariant));
@@ -509,3 +517,14 @@ BVariant::_SetTo(const char* value, uint32 flags)
 	return true;
 }
 
+
+void
+BVariant::_SetTo(BReferenceable* value, type_code type)
+{
+	fType = type;
+	fFlags = B_VARIANT_REFERENCEABLE_DATA;
+	fReferenceable = value;
+
+	if (fReferenceable != NULL)
+		fReferenceable->AcquireReference();
+}