Pull merge from lindenlab/viewer-release. Fixed some conflicts and compile errors

1 files changed, 836 insertions, 0 deletions

diff --git a/indra/llcommon/llunittype.h b/indra/llcommon/llunittype.h
new file mode 100644
index 0000000000..0e05ecd683
--- /dev/null
+++ b/indra/llcommon/llunittype.h
@@ -0,0 +1,836 @@
+/** 
+ * @file llunit.h
+ * @brief Unit conversion classes
+ *
+ * $LicenseInfo:firstyear=2001&license=viewerlgpl$
+ * Second Life Viewer Source Code
+ * Copyright (C) 2012, 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 LL_UNITTYPE_H
+#define LL_UNITTYPE_H
+
+#include "stdtypes.h"
+#include "llpreprocessor.h"
+#include "llerror.h"
+
+//lightweight replacement of type traits for simple type equality check
+template<typename S, typename T> 
+struct LLIsSameType
+{
+	static const bool value = false;
+};
+
+template<typename T>
+struct LLIsSameType<T, T>
+{
+	static const bool value = true;
+};
+
+// workaround for decltype() not existing and typeof() not working inline in gcc 4.2
+template<typename S, typename T>
+struct LLResultTypeAdd
+{
+	typedef LL_TYPEOF(S() + T()) type_t;
+};
+
+template<typename S, typename T>
+struct LLResultTypeSubtract
+{
+	typedef LL_TYPEOF(S() - T()) type_t;
+};
+
+template<typename S, typename T>
+struct LLResultTypeMultiply
+{
+	typedef LL_TYPEOF(S() * T()) type_t;
+};
+
+template<typename S, typename T>
+struct LLResultTypeDivide
+{
+	typedef LL_TYPEOF(S() / T(1)) type_t;
+};
+
+template<typename S, typename T>
+struct LLResultTypePromote
+{
+	typedef LL_TYPEOF((true) ? S() : T()) type_t;
+};
+
+template<typename STORAGE_TYPE, typename UNITS>
+struct LLUnit
+{
+	typedef LLUnit<STORAGE_TYPE, UNITS> self_t;
+	typedef STORAGE_TYPE storage_t;
+	typedef void is_unit_t;
+
+	// value initialization
+	LL_FORCE_INLINE explicit LLUnit(storage_t value = storage_t())
+	:	mValue(value)
+	{}
+
+	// unit initialization and conversion
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE LLUnit(LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other)
+	:	mValue(convert(other).mValue)
+	{}
+	
+	LL_FORCE_INLINE storage_t value() const
+	{
+		return mValue;
+	}
+
+	LL_FORCE_INLINE void value(storage_t value)
+	{
+		mValue = value;
+	}
+
+	template<typename NEW_UNITS> 
+	storage_t valueInUnits()
+	{
+		return LLUnit<storage_t, NEW_UNITS>(*this).value();
+	}
+
+	template<typename NEW_UNITS> 
+	void valueInUnits(storage_t value)
+	{
+		*this = LLUnit<storage_t, NEW_UNITS>(value);
+	}
+
+	LL_FORCE_INLINE void operator += (self_t other)
+	{
+		mValue += convert(other).mValue;
+	}
+
+	LL_FORCE_INLINE void operator -= (self_t other)
+	{
+		mValue -= convert(other).mValue;
+	}
+
+	LL_FORCE_INLINE void operator *= (storage_t multiplicand)
+	{
+		mValue *= multiplicand;
+	}
+
+	LL_FORCE_INLINE void operator *= (self_t multiplicand)
+	{
+		// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
+		LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "Multiplication of unit types not supported.");
+	}
+
+	LL_FORCE_INLINE void operator /= (storage_t divisor)
+	{
+		mValue /= divisor;
+	}
+
+	void operator /= (self_t divisor)
+	{
+		// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
+		LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "Illegal in-place division of unit types.");
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator == (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue == convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator != (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue != convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator < (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue < convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator <= (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue <= convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator > (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue > convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator >= (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return mValue >= convert(other).value();
+	}
+
+	LL_FORCE_INLINE static self_t convert(self_t v) 
+	{ 
+		return v;
+	}
+
+	template<typename FROM_STORAGE_TYPE>
+	LL_FORCE_INLINE static self_t convert(LLUnit<FROM_STORAGE_TYPE, UNITS> v) 
+	{
+		self_t result;
+		result.mValue = (STORAGE_TYPE)v.value();
+		return result;
+	}
+
+	template<typename FROM_UNITS>
+	LL_FORCE_INLINE static self_t convert(LLUnit<STORAGE_TYPE, FROM_UNITS> v) 
+	{
+		self_t result;
+		STORAGE_TYPE divisor = ll_convert_units(v, result);
+		result.mValue /= divisor;
+		return result;
+	}
+
+	template<typename FROM_STORAGE_TYPE, typename FROM_UNITS>
+	LL_FORCE_INLINE static self_t convert(LLUnit<FROM_STORAGE_TYPE, FROM_UNITS> v) 
+	{ 
+		typedef typename LLResultTypePromote<FROM_STORAGE_TYPE, STORAGE_TYPE>::type_t result_storage_t;
+		LLUnit<result_storage_t, UNITS> result;
+		result_storage_t divisor = ll_convert_units(v, result);
+		result.value(result.value() / divisor);
+		return self_t(result.value());
+	}
+
+protected:
+	storage_t mValue;
+};
+
+template<typename STORAGE_TYPE, typename UNITS>
+std::ostream& operator <<(std::ostream& s, const LLUnit<STORAGE_TYPE, UNITS>& unit)
+{
+        s << unit.value() << UNITS::getUnitLabel();
+        return s;
+}
+
+template<typename STORAGE_TYPE, typename UNITS>
+std::istream& operator >>(std::istream& s, LLUnit<STORAGE_TYPE, UNITS>& unit)
+{
+        STORAGE_TYPE val;
+        s >> val;
+        unit.value(val);
+        return s;
+}
+
+template<typename STORAGE_TYPE, typename UNITS>
+struct LLUnitImplicit : public LLUnit<STORAGE_TYPE, UNITS>
+{
+	typedef LLUnitImplicit<STORAGE_TYPE, UNITS> self_t;
+	typedef typename LLUnit<STORAGE_TYPE, UNITS>::storage_t storage_t;
+	typedef LLUnit<STORAGE_TYPE, UNITS> base_t;
+
+	LL_FORCE_INLINE LLUnitImplicit(storage_t value = storage_t())
+	:	base_t(value)
+	{}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE LLUnitImplicit(LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other)
+	:	base_t(other)
+	{}
+
+	// unlike LLUnit, LLUnitImplicit is *implicitly* convertable to a POD value (F32, S32, etc)
+	// this allows for interoperability with legacy code
+	LL_FORCE_INLINE operator storage_t() const
+	{
+		return base_t::value();
+	}
+
+	using base_t::operator +=;
+	LL_FORCE_INLINE void operator += (storage_t value)
+	{
+        base_t::mValue += value;
+	}
+
+	// this overload exists to explicitly catch use of another implicit unit
+	// without ambiguity between conversion to storage_t vs conversion to base_t
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE void operator += (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other)
+	{
+        base_t::mValue += convert(other).value();
+	}
+
+	using base_t::operator -=;
+	LL_FORCE_INLINE void operator -= (storage_t value)
+	{
+        base_t::mValue -= value;
+	}
+
+	// this overload exists to explicitly catch use of another implicit unit
+	// without ambiguity between conversion to storage_t vs conversion to base_t
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE void operator -= (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other)
+	{
+        base_t::mValue -= convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator == (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue == convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator == (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue == convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator == (STORAGE_T other) const
+	{
+		return base_t::mValue == other;
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator != (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue != convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator != (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue != convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator != (STORAGE_T other) const
+	{
+		return base_t::mValue != other;
+	}
+	
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator < (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue < convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator < (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue < convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator < (STORAGE_T other) const
+	{
+		return base_t::mValue < other;
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator <= (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue <= convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator <= (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue <= convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator <= (STORAGE_T other) const
+	{
+		return base_t::mValue <= other;
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator > (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue > convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator > (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue > convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator > (STORAGE_T other) const
+	{
+		return base_t::mValue > other;
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator >= (LLUnit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue >= convert(other).value();
+	}
+
+	template<typename OTHER_STORAGE_TYPE, typename OTHER_UNITS>
+	LL_FORCE_INLINE bool operator >= (LLUnitImplicit<OTHER_STORAGE_TYPE, OTHER_UNITS> other) const
+	{
+		return base_t::mValue >= convert(other).value();
+	}
+
+	template<typename STORAGE_T>
+	LL_FORCE_INLINE bool operator >= (STORAGE_T other) const
+	{
+		return base_t::mValue >= other;
+	}
+};
+
+template<typename STORAGE_TYPE, typename UNITS>
+std::ostream& operator <<(std::ostream& s, const LLUnitImplicit<STORAGE_TYPE, UNITS>& unit)
+{
+        s << unit.value() << UNITS::getUnitLabel();
+        return s;
+}
+
+template<typename STORAGE_TYPE, typename UNITS>
+std::istream& operator >>(std::istream& s, LLUnitImplicit<STORAGE_TYPE, UNITS>& unit)
+{
+        STORAGE_TYPE val;
+        s >> val;
+        unit = val;
+        return s;
+}
+
+template<typename S1, typename T1, typename S2, typename T2>
+LL_FORCE_INLINE S2 ll_convert_units(LLUnit<S1, T1> in, LLUnit<S2, T2>& out)
+{
+	S2 divisor(1);
+
+	LL_STATIC_ASSERT((LLIsSameType<T1, T2>::value 
+						|| !LLIsSameType<T1, typename T1::base_unit_t>::value 
+						|| !LLIsSameType<T2, typename T2::base_unit_t>::value), 
+						"conversion requires compatible units");
+
+	if (LLIsSameType<T1, T2>::value)
+	{
+		// T1 and T2 same type, just assign
+		out.value((S2)in.value());
+	}
+	else if (T1::sLevel > T2::sLevel)
+	{
+		// reduce T1
+		LLUnit<S2, typename T1::base_unit_t> new_in;
+		divisor *= (S2)ll_convert_units(in, new_in);
+		divisor *= (S2)ll_convert_units(new_in, out);
+	}
+	else
+	{
+		// reduce T2
+		LLUnit<S2, typename T2::base_unit_t> new_out;
+		divisor *= (S2)ll_convert_units(in, new_out);
+		divisor *= (S2)ll_convert_units(new_out, out);
+	}
+	return divisor;
+}
+
+template<typename T>
+struct LLStorageType
+{
+	typedef T type_t;
+};
+
+template<typename STORAGE_TYPE, typename UNITS>
+struct LLStorageType<LLUnit<STORAGE_TYPE, UNITS> >
+{
+	typedef STORAGE_TYPE type_t;
+};
+
+// all of these operators need to perform type promotion on the storage type of the units, so they 
+// cannot be expressed as operations on identical types with implicit unit conversion 
+// e.g. typeof(S32Bytes(x) + F32Megabytes(y)) <==> F32Bytes
+
+//
+// operator +
+//
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator + (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result += second;
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS>
+LLUnit<STORAGE_TYPE, UNITS> operator + (LLUnit<STORAGE_TYPE, UNITS> first, UNITLESS second)
+{
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "operator + requires compatible unit types");
+	return LLUnit<STORAGE_TYPE, UNITS>(0);
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS>
+LLUnit<STORAGE_TYPE, UNITS> operator + (UNITLESS first, LLUnit<STORAGE_TYPE, UNITS> second)
+{
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "operator + requires compatible unit types");
+	return LLUnit<STORAGE_TYPE, UNITS>(0);
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator + (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result += second;
+	return result;
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator + (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result += second;
+	return result;
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator + (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result += LLUnitImplicit<STORAGE_TYPE1, UNITS1>(second);
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator + (LLUnitImplicit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	LLUnitImplicit<typename LLResultTypeAdd<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> result(first);
+	result += second;
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeAdd<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::
+	type_t, UNITS> operator + (UNITLESS_TYPE first, LLUnitImplicit<STORAGE_TYPE, UNITS> second)
+{
+	LLUnitImplicit<typename LLResultTypeAdd<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS> result(first);
+	result += second;
+	return result;
+}
+
+//
+// operator -
+//
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator - (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result -= second;
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS>
+LLUnit<STORAGE_TYPE, UNITS> operator - (LLUnit<STORAGE_TYPE, UNITS> first, UNITLESS second)
+{
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "operator - requires compatible unit types");
+	return LLUnit<STORAGE_TYPE, UNITS>(0);
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS>
+LLUnit<STORAGE_TYPE, UNITS> operator - (UNITLESS first, LLUnit<STORAGE_TYPE, UNITS> second)
+{
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE, "operator - requires compatible unit types");
+	return LLUnit<STORAGE_TYPE, UNITS>(0);
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator - (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result -= second;
+	return result;
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator - (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result -= second;
+	return result;
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> operator - (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE1, STORAGE_TYPE2>::type_t, UNITS1> result(first);
+	result -= LLUnitImplicit<STORAGE_TYPE1, UNITS1>(second);
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator - (LLUnitImplicit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	LLUnitImplicit<typename LLResultTypeSubtract<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> result(first);
+	result -= second;
+	return result;
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeSubtract<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS> operator - (UNITLESS_TYPE first, LLUnitImplicit<STORAGE_TYPE, UNITS> second)
+{
+	LLUnitImplicit<typename LLResultTypeSubtract<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS> result(first);
+	result -= second;
+	return result;
+}
+
+//
+// operator *
+//
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LLUnit<STORAGE_TYPE1, UNITS1> operator * (LLUnit<STORAGE_TYPE1, UNITS1>, LLUnit<STORAGE_TYPE2, UNITS2>)
+{
+	// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE1, "multiplication of unit types results in new unit type - not supported.");
+	return LLUnit<STORAGE_TYPE1, UNITS1>();
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnit<typename LLResultTypeMultiply<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator * (LLUnit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	return LLUnit<typename LLResultTypeMultiply<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS>(first.value() * second);
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnit<typename LLResultTypeMultiply<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS> operator * (UNITLESS_TYPE first, LLUnit<STORAGE_TYPE, UNITS> second)
+{
+	return LLUnit<typename LLResultTypeMultiply<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS>(first * second.value());
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LLUnitImplicit<STORAGE_TYPE1, UNITS1> operator * (LLUnitImplicit<STORAGE_TYPE1, UNITS1>, LLUnitImplicit<STORAGE_TYPE2, UNITS2>)
+{
+	// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
+	LL_BAD_TEMPLATE_INSTANTIATION(STORAGE_TYPE1, "multiplication of unit types results in new unit type - not supported.");
+	return LLUnitImplicit<STORAGE_TYPE1, UNITS1>();
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeMultiply<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator * (LLUnitImplicit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	return LLUnitImplicit<typename LLResultTypeMultiply<STORAGE_TYPE, UNITLESS_TYPE>::type_t, UNITS>(first.value() * second);
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeMultiply<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS> operator * (UNITLESS_TYPE first, LLUnitImplicit<STORAGE_TYPE, UNITS> second)
+{
+	return LLUnitImplicit<typename LLResultTypeMultiply<typename LLStorageType<UNITLESS_TYPE>::type_t, STORAGE_TYPE>::type_t, UNITS>(first * second.value());
+}
+
+
+//
+// operator /
+//
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnit<typename LLResultTypeDivide<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator / (LLUnit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	return LLUnit<typename LLResultTypeDivide<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS>(first.value() / second);
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t operator / (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	return first.value() / first.convert(second).value();
+}
+
+template<typename STORAGE_TYPE, typename UNITS, typename UNITLESS_TYPE>
+LL_FORCE_INLINE LLUnitImplicit<typename LLResultTypeDivide<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS> operator / (LLUnitImplicit<STORAGE_TYPE, UNITS> first, UNITLESS_TYPE second)
+{
+	return LLUnitImplicit<typename LLResultTypeDivide<STORAGE_TYPE, typename LLStorageType<UNITLESS_TYPE>::type_t>::type_t, UNITS>(first.value() / second);
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t operator / (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	return (typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t)(first.value() / first.convert(second).value());
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t operator / (LLUnit<STORAGE_TYPE1, UNITS1> first, LLUnitImplicit<STORAGE_TYPE2, UNITS2> second)
+{
+	return (typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t)(first.value() / first.convert(second).value());
+}
+
+template<typename STORAGE_TYPE1, typename UNITS1, typename STORAGE_TYPE2, typename UNITS2>
+LL_FORCE_INLINE typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t operator / (LLUnitImplicit<STORAGE_TYPE1, UNITS1> first, LLUnit<STORAGE_TYPE2, UNITS2> second)
+{
+	return (typename LLResultTypeDivide<STORAGE_TYPE1, STORAGE_TYPE2>::type_t)(first.value() / first.convert(second).value());
+}
+
+template<typename T> 
+struct LLGetUnitLabel
+{
+	static const char* getUnitLabel() { return ""; }
+};
+
+template<typename T, typename STORAGE_T>
+struct LLGetUnitLabel<LLUnit<STORAGE_T, T> >
+{
+	static const char* getUnitLabel() { return T::getUnitLabel(); }
+};
+
+template<typename T>
+struct LLUnitLinearOps
+{
+	typedef LLUnitLinearOps<T> self_t;
+
+	LLUnitLinearOps(T val) 
+	:	mValue(val),
+		mDivisor(1)
+	{}
+
+	template<typename OTHER_T>
+	self_t operator * (OTHER_T other)
+	{
+		return mValue * other;
+	}
+
+	template<typename OTHER_T>
+	self_t operator / (OTHER_T other)
+	{
+		mDivisor *= other;
+		return *this;
+	}
+
+	template<typename OTHER_T>
+	self_t operator + (OTHER_T other)
+	{
+		mValue += other * mDivisor;
+		return *this;
+	}
+
+	template<typename OTHER_T>
+	self_t operator - (OTHER_T other)
+	{
+		mValue -= other * mDivisor;
+		return *this;
+	}
+
+	T mValue;
+	T mDivisor;
+};
+
+template<typename T>
+struct LLUnitInverseLinearOps
+{
+	typedef LLUnitInverseLinearOps<T> self_t;
+
+	LLUnitInverseLinearOps(T val) 
+	:	mValue(val),
+		mDivisor(1),
+		mMultiplicand(1)
+	{}
+
+	template<typename OTHER_T>
+	self_t operator * (OTHER_T other)
+	{
+		mDivisor *= other;
+		return *this;
+	}
+
+	template<typename OTHER_T>
+	self_t operator / (OTHER_T other)
+	{
+		mValue *= other;
+		mMultiplicand *= other;
+		return *this;
+	}
+
+	template<typename OTHER_T>
+	self_t operator + (OTHER_T other)
+	{
+		mValue -= other * mMultiplicand;
+		return *this;
+	}
+
+	template<typename OTHER_T>
+	self_t operator - (OTHER_T other)
+	{
+		mValue += other * mMultiplicand;
+		return *this;
+	}
+
+	T mValue;
+	T mDivisor;
+	T mMultiplicand;
+};
+
+#define LL_DECLARE_BASE_UNIT(base_unit_name, unit_label)                                             \
+struct base_unit_name                                                                                \
+{                                                                                                    \
+	static const int sLevel = 0;                                                                     \
+	typedef base_unit_name base_unit_t;                                                              \
+	static const char* getUnitLabel() { return unit_label; }                                         \
+	template<typename T>                                                                             \
+	static LLUnit<T, base_unit_name> fromValue(T value) { return LLUnit<T, base_unit_name>(value); } \
+	template<typename STORAGE_T, typename UNIT_T>                                                    \
+	static LLUnit<STORAGE_T, base_unit_name> fromValue(LLUnit<STORAGE_T, UNIT_T> value)              \
+	{ return LLUnit<STORAGE_T, base_unit_name>(value); }                                             \
+}
+
+
+#define LL_DECLARE_DERIVED_UNIT(unit_name, unit_label, base_unit_name, conversion_operation)	 \
+struct unit_name                                                                                 \
+{                                                                                                \
+	static const int sLevel = base_unit_name::sLevel + 1;                                        \
+	typedef base_unit_name base_unit_t;                                                          \
+	static const char* getUnitLabel() { return unit_label; }									 \
+	template<typename T>                                                                         \
+	static LLUnit<T, unit_name> fromValue(T value) { return LLUnit<T, unit_name>(value); }		 \
+	template<typename STORAGE_T, typename UNIT_T>                                                \
+	static LLUnit<STORAGE_T, unit_name> fromValue(LLUnit<STORAGE_T, UNIT_T> value)				 \
+	{ return LLUnit<STORAGE_T, unit_name>(value); }												 \
+};                                                                                               \
+	                                                                                             \
+template<typename S1, typename S2>                                                               \
+LL_FORCE_INLINE S2 ll_convert_units(LLUnit<S1, unit_name> in, LLUnit<S2, base_unit_name>& out)   \
+{                                                                                                \
+	typedef typename LLResultTypePromote<S1, S2>::type_t result_storage_t;                       \
+	LLUnitInverseLinearOps<result_storage_t> result =                                            \
+		LLUnitInverseLinearOps<result_storage_t>(in.value()) conversion_operation;               \
+	out = LLUnit<S2, base_unit_name>((S2)result.mValue);	                                     \
+	return result.mDivisor;                                                                      \
+}                                                                                                \
+                                                                                                 \
+template<typename S1, typename S2>                                                               \
+LL_FORCE_INLINE S2 ll_convert_units(LLUnit<S1, base_unit_name> in, LLUnit<S2, unit_name>& out)   \
+{                                                                                                \
+	typedef typename LLResultTypePromote<S1, S2>::type_t result_storage_t;                       \
+	LLUnitLinearOps<result_storage_t> result =                                                   \
+		LLUnitLinearOps<result_storage_t>(in.value()) conversion_operation;				         \
+	out = LLUnit<S2, unit_name>((S2)result.mValue);                                              \
+	return result.mDivisor;                                                                      \
+}                                                                                               
+
+#define LL_DECLARE_UNIT_TYPEDEFS(ns, unit_name)                         \
+	typedef LLUnit<F32, ns::unit_name> F32##unit_name;                  \
+	typedef LLUnitImplicit<F32, ns::unit_name> F32##unit_name##Implicit;\
+	typedef LLUnit<F64, ns::unit_name> F64##unit_name;                  \
+	typedef LLUnitImplicit<F64, ns::unit_name> F64##unit_name##Implicit;\
+	typedef LLUnit<S32, ns::unit_name> S32##unit_name;                  \
+	typedef LLUnitImplicit<S32, ns::unit_name> S32##unit_name##Implicit;\
+	typedef LLUnit<S64, ns::unit_name> S64##unit_name;                  \
+	typedef LLUnitImplicit<S64, ns::unit_name> S64##unit_name##Implicit;\
+	typedef LLUnit<U32, ns::unit_name> U32##unit_name;                  \
+	typedef LLUnitImplicit<U32, ns::unit_name> U32##unit_name##Implicit;\
+	typedef LLUnit<U64, ns::unit_name> U64##unit_name;                  \
+	typedef LLUnitImplicit<U64, ns::unit_name> U64##unit_name##Implicit
+
+#endif //LL_UNITTYPE_H