Move llhandle.h into llcommon; same generality as llpointer.h.

Leaving llhandle.h in llui restricts the set of viewer project directories
which could potentially use it, and there's nothing whatsoever UI-specific
about it.

2 files changed, 182 insertions, 0 deletions

diff --git a/indra/llcommon/CMakeLists.txt b/indra/llcommon/CMakeLists.txt
index dd7b8c6eb8..36a8319189 100644
--- a/indra/llcommon/CMakeLists.txt
+++ b/indra/llcommon/CMakeLists.txt
@@ -174,6 +174,7 @@ set(llcommon_HEADER_FILES
     llfoldertype.h
     llformat.h
     llframetimer.h
+    llhandle.h
     llhash.h
     llheartbeat.h
     llhttpstatuscodes.h
diff --git a/indra/llcommon/llhandle.h b/indra/llcommon/llhandle.h
new file mode 100644
index 0000000000..37c657dd92
--- /dev/null
+++ b/indra/llcommon/llhandle.h
@@ -0,0 +1,181 @@
+/** 
+* @file llhandle.h
+* @brief "Handle" to an object (usually a floater) whose lifetime you don't
+* control.
+*
+* $LicenseInfo:firstyear=2001&license=viewerlgpl$
+* Second Life Viewer Source Code
+* Copyright (C) 2010, Linden Research, Inc.
+* 
+* This library is free software; you can redistribute it and/or
+* modify it under the terms of the GNU Lesser General Public
+* License as published by the Free Software Foundation;
+* version 2.1 of the License only.
+* 
+* This library is distributed in the hope that it will be useful,
+* but WITHOUT ANY WARRANTY; without even the implied warranty of
+* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+* Lesser General Public License for more details.
+* 
+* You should have received a copy of the GNU Lesser General Public
+* License along with this library; if not, write to the Free Software
+* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
+* 
+* Linden Research, Inc., 945 Battery Street, San Francisco, CA  94111  USA
+* $/LicenseInfo$
+*/
+#ifndef LLHANDLE_H
+#define LLHANDLE_H
+
+#include "llpointer.h"
+#include <boost/type_traits/is_convertible.hpp>
+#include <boost/utility/enable_if.hpp>
+
+class LLTombStone : public LLRefCount
+{
+public:
+	LLTombStone(void* target = NULL) : mTarget(target) {}
+
+	void setTarget(void* target) { mTarget = target; }
+	void* getTarget() const { return mTarget; }
+private:
+	mutable void* mTarget;
+};
+
+//	LLHandles are used to refer to objects whose lifetime you do not control or influence.  
+//	Calling get() on a handle will return a pointer to the referenced object or NULL, 
+//	if the object no longer exists.  Note that during the lifetime of the returned pointer, 
+//	you are assuming that the object will not be deleted by any action you perform, 
+//	or any other thread, as normal when using pointers, so avoid using that pointer outside of
+//	the local code block.
+// 
+//  https://wiki.lindenlab.com/mediawiki/index.php?title=LLHandle&oldid=79669
+
+template <typename T>
+class LLHandle
+{
+	template <typename U> friend class LLHandle;
+	template <typename U> friend class LLHandleProvider;
+public:
+	LLHandle() : mTombStone(getDefaultTombStone()) {}
+
+	template<typename U>
+	LLHandle(const LLHandle<U>& other, typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0)
+	: mTombStone(other.mTombStone)
+	{}
+
+	bool isDead() const 
+	{ 
+		return mTombStone->getTarget() == NULL; 
+	}
+
+	void markDead() 
+	{ 
+		mTombStone = getDefaultTombStone();
+	}
+
+	T* get() const
+	{
+		return reinterpret_cast<T*>(mTombStone->getTarget());
+	}
+
+	friend bool operator== (const LLHandle<T>& lhs, const LLHandle<T>& rhs)
+	{
+		return lhs.mTombStone == rhs.mTombStone;
+	}
+	friend bool operator!= (const LLHandle<T>& lhs, const LLHandle<T>& rhs)
+	{
+		return !(lhs == rhs);
+	}
+	friend bool	operator< (const LLHandle<T>& lhs, const LLHandle<T>& rhs)
+	{
+		return lhs.mTombStone < rhs.mTombStone;
+	}
+	friend bool	operator> (const LLHandle<T>& lhs, const LLHandle<T>& rhs)
+	{
+		return lhs.mTombStone > rhs.mTombStone;
+	}
+
+protected:
+	LLPointer<LLTombStone> mTombStone;
+
+private:
+	typedef T* pointer_t;
+	static LLPointer<LLTombStone>& getDefaultTombStone()
+	{
+		static LLPointer<LLTombStone> sDefaultTombStone = new LLTombStone;
+		return sDefaultTombStone;
+	}
+};
+
+template <typename T>
+class LLRootHandle : public LLHandle<T>
+{
+public:
+	typedef LLRootHandle<T> self_t;
+	typedef LLHandle<T> base_t;
+
+	LLRootHandle(T* object) { bind(object); }
+	LLRootHandle() {};
+	~LLRootHandle() { unbind(); }
+
+	// this is redundant, since an LLRootHandle *is* an LLHandle
+	//LLHandle<T> getHandle() { return LLHandle<T>(*this); }
+
+	void bind(T* object) 
+	{ 
+		// unbind existing tombstone
+		if (LLHandle<T>::mTombStone.notNull())
+		{
+			if (LLHandle<T>::mTombStone->getTarget() == (void*)object) return;
+			LLHandle<T>::mTombStone->setTarget(NULL);
+		}
+		// tombstone reference counted, so no paired delete
+		LLHandle<T>::mTombStone = new LLTombStone((void*)object);
+	}
+
+	void unbind() 
+	{
+		LLHandle<T>::mTombStone->setTarget(NULL);
+	}
+
+	//don't allow copying of root handles, since there should only be one
+private:
+	LLRootHandle(const LLRootHandle& other) {};
+};
+
+// Use this as a mixin for simple classes that need handles and when you don't
+// want handles at multiple points of the inheritance hierarchy
+template <typename T>
+class LLHandleProvider
+{
+public:
+	LLHandle<T> getHandle() const
+	{ 
+		// perform lazy binding to avoid small tombstone allocations for handle
+		// providers whose handles are never referenced
+		mHandle.bind(static_cast<T*>(const_cast<LLHandleProvider<T>* >(this))); 
+		return mHandle; 
+	}
+
+protected:
+	typedef LLHandle<T> handle_type_t;
+	LLHandleProvider() 
+	{
+		// provided here to enforce T deriving from LLHandleProvider<T>
+	} 
+
+	template <typename U>
+	LLHandle<U> getDerivedHandle(typename boost::enable_if< typename boost::is_convertible<U*, T*> >::type* dummy = 0) const
+	{
+		LLHandle<U> downcast_handle;
+		downcast_handle.mTombStone = getHandle().mTombStone;
+		return downcast_handle;
+	}
+
+
+private:
+	mutable LLRootHandle<T> mHandle;
+};
+
+#endif