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/**
* @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_LLUNIT_H
#define LL_LLUNIT_H
#include "stdtypes.h"
#include "llpreprocessor.h"
template<typename BASE_UNIT, typename DERIVED_UNIT = BASE_UNIT>
struct LLUnit : public BASE_UNIT
{
typedef LLUnit<BASE_UNIT, DERIVED_UNIT> unit_t;
typedef typename BASE_UNIT::value_t value_t;
typedef void is_unit_t;
LLUnit()
{}
explicit LLUnit(value_t value)
: BASE_UNIT(convertToBase(value))
{}
operator value_t() { return value(); }
value_t value() const
{
return convertToDerived(mValue);
}
template<typename CONVERTED_TYPE>
value_t value() const
{
return CONVERTED_TYPE(*this).value();
}
static value_t convertToBase(value_t derived_value)
{
return (value_t)((F32)derived_value * DERIVED_UNIT::conversionToBaseFactor());
}
static value_t convertToDerived(value_t base_value)
{
return (value_t)((F32)base_value / DERIVED_UNIT::conversionToBaseFactor());
}
};
template<typename T>
struct LLUnit<T, T>
{
typedef LLUnit<T, T> unit_t;
typedef T value_t;
typedef void is_unit_t;
LLUnit()
: mValue()
{}
explicit LLUnit(T value)
: mValue(value)
{}
unit_t& operator=(T value)
{
setBaseValue(value);
return *this;
}
value_t value() { return mValue; }
static value_t convertToBase(value_t derived_value)
{
return (value_t)1;
}
static value_t convertToDerived(value_t base_value)
{
return (value_t)1;
}
unit_t operator + (const unit_t other) const
{
return unit_t(mValue + other.mValue);
}
void operator += (const unit_t other)
{
mValue += other.mValue;
}
unit_t operator - (const unit_t other) const
{
return unit_t(mValue - other.mValue);
}
void operator -= (const unit_t other)
{
mValue -= other.mValue;
}
unit_t operator * (value_t multiplicand) const
{
return unit_t(mValue * multiplicand);
}
void operator *= (value_t multiplicand)
{
mValue *= multiplicand;
}
unit_t operator / (value_t divisor) const
{
return unit_t(mValue / divisor);
}
void operator /= (value_t divisor)
{
mValue /= divisor;
}
protected:
void setBaseValue(T value)
{
mValue = value;
}
T mValue;
};
#define LL_DECLARE_BASE_UNIT(unit_name) \
template<typename STORAGE_TYPE> \
struct unit_name : public LLUnit<STORAGE_TYPE> \
{ \
unit_name(STORAGE_TYPE value) \
: LLUnit(value) \
{} \
\
unit_name() \
{} \
\
template <typename T> \
unit_name(const LLUnit<unit_name, T>& other) \
{ \
setBaseValue(other.unit_name::get()); \
} \
\
using LLUnit<STORAGE_TYPE>::operator +; \
using LLUnit<STORAGE_TYPE>::operator +=; \
using LLUnit<STORAGE_TYPE>::operator -; \
using LLUnit<STORAGE_TYPE>::operator -=; \
using LLUnit<STORAGE_TYPE>::operator *; \
using LLUnit<STORAGE_TYPE>::operator *=; \
using LLUnit<STORAGE_TYPE>::operator /; \
using LLUnit<STORAGE_TYPE>::operator /=; \
};
#define LL_DECLARE_DERIVED_UNIT(base_unit, derived_unit, conversion_factor) \
template<typename STORAGE_TYPE> \
struct derived_unit : public LLUnit<base_unit<STORAGE_TYPE>, derived_unit<STORAGE_TYPE> > \
{ \
derived_unit(value_t value) \
: LLUnit(value) \
{} \
\
derived_unit() \
{} \
\
template <typename T> \
derived_unit(const LLUnit<base_unit<STORAGE_TYPE>, T>& other) \
{ \
setBaseValue(other.base_unit<STORAGE_TYPE>::get()); \
} \
\
static F32 conversionToBaseFactor() { return (F32)(conversion_factor); } \
\
using LLUnit<STORAGE_TYPE>::operator +; \
using LLUnit<STORAGE_TYPE>::operator +=; \
using LLUnit<STORAGE_TYPE>::operator -; \
using LLUnit<STORAGE_TYPE>::operator -=; \
using LLUnit<STORAGE_TYPE>::operator *; \
using LLUnit<STORAGE_TYPE>::operator *=; \
using LLUnit<STORAGE_TYPE>::operator /; \
using LLUnit<STORAGE_TYPE>::operator /=; \
};
namespace LLUnits
{
LL_DECLARE_BASE_UNIT(Bytes);
LL_DECLARE_DERIVED_UNIT(Bytes, Kilobytes, 1024);
LL_DECLARE_DERIVED_UNIT(Bytes, Megabytes, 1024 * 1024);
LL_DECLARE_DERIVED_UNIT(Bytes, Gigabytes, 1024 * 1024 * 1024);
LL_DECLARE_DERIVED_UNIT(Bytes, Bits, (1.f / 8.f));
LL_DECLARE_DERIVED_UNIT(Bytes, Kilobit, (1024 / 8));
LL_DECLARE_DERIVED_UNIT(Bytes, Megabits, (1024 / 8));
LL_DECLARE_DERIVED_UNIT(Bytes, Gigabits, (1024 * 1024 * 1024 / 8));
LL_DECLARE_BASE_UNIT(Seconds);
LL_DECLARE_DERIVED_UNIT(Seconds, Minutes, 60);
LL_DECLARE_DERIVED_UNIT(Seconds, Hours, 60 * 60);
LL_DECLARE_DERIVED_UNIT(Seconds, Days, 60 * 60 * 24);
LL_DECLARE_DERIVED_UNIT(Seconds, Weeks, 60 * 60 * 24 * 7);
LL_DECLARE_DERIVED_UNIT(Seconds, Milliseconds, (1.f / 1000.f));
LL_DECLARE_DERIVED_UNIT(Seconds, Microseconds, (1.f / (1000000.f)));
LL_DECLARE_DERIVED_UNIT(Seconds, Nanoseconds, (1.f / (1000000000.f)));
}
#endif // LL_LLUNIT_H
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