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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 STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT = BASE_UNIT>
struct LLUnitType : public BASE_UNIT
{
typedef DERIVED_UNIT unit_t;
typedef typename BASE_UNIT::value_t value_t;
typedef void is_unit_t;
LLUnitType()
{}
explicit LLUnitType(value_t value)
: BASE_UNIT(convertToBase(value))
{}
operator unit_t& ()
{
return static_cast<unit_t&>(*this);
}
value_t value() const
{
return convertToDerived(mBaseValue);
}
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 * unit_t::conversionToBaseFactor());
}
static value_t convertToDerived(value_t base_value)
{
return (value_t)((F32)base_value / unit_t::conversionToBaseFactor());
}
unit_t operator + (const unit_t other) const
{
return unit_t(mBaseValue + other.mBaseValue);
}
unit_t operator - (const unit_t other) const
{
return unit_t(mBaseValue - other.mBaseValue);
}
unit_t operator * (value_t multiplicand) const
{
return unit_t(mBaseValue * multiplicand);
}
unit_t operator / (value_t divisor) const
{
return unit_t(mBaseValue / divisor);
}
};
template<typename STORAGE_TYPE, typename T>
struct LLUnitType<STORAGE_TYPE, T, T>
{
typedef T unit_t;
typedef typename STORAGE_TYPE value_t;
typedef void is_unit_t;
LLUnitType()
: mBaseValue()
{}
explicit LLUnitType(value_t value)
: mBaseValue(value)
{}
unit_t& operator=(value_t value)
{
setBaseValue(value);
return *this;
}
operator unit_t& ()
{
return static_cast<unit_t&>(*this);
}
value_t value() const { return mBaseValue; }
static value_t convertToBase(value_t derived_value)
{
return (value_t)derived_value;
}
static value_t convertToDerived(value_t base_value)
{
return (value_t)base_value;
}
unit_t operator + (const unit_t other) const
{
return unit_t(mBaseValue + other.mBaseValue);
}
void operator += (const unit_t other)
{
mBaseValue += other.mBaseValue;
}
unit_t operator - (const unit_t other) const
{
return unit_t(mBaseValue - other.mBaseValue);
}
void operator -= (const unit_t other)
{
mBaseValue -= other.mBaseValue;
}
unit_t operator * (value_t multiplicand) const
{
return unit_t(mBaseValue * multiplicand);
}
void operator *= (value_t multiplicand)
{
mBaseValue *= multiplicand;
}
unit_t operator / (value_t divisor) const
{
return unit_t(mBaseValue / divisor);
}
void operator /= (value_t divisor)
{
mBaseValue /= divisor;
}
protected:
void setBaseValue(value_t value)
{
mBaseValue = value;
}
value_t mBaseValue;
};
#define LL_DECLARE_BASE_UNIT(unit_name) \
struct unit_name : public LLUnitType<F64, unit_name> \
{ \
typedef unit_name base_unit_t; \
typedef LLUnitType<F64, unit_name> unit_t; \
typedef F64 storage_t; \
\
unit_name(F64 value) \
: LLUnitType(value) \
{} \
\
unit_name() \
{} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
unit_name(const LLUnitType<SOURCE_STORAGE_TYPE, unit_name, SOURCE_TYPE>& source) \
{ \
setBaseValue((F64)source.unit_name::unit_t::value()); \
} \
\
using LLUnitType::operator +; \
using LLUnitType::operator +=; \
using LLUnitType::operator -; \
using LLUnitType::operator -=; \
using LLUnitType::operator *; \
using LLUnitType::operator *=; \
using LLUnitType::operator /; \
using LLUnitType::operator /=; \
};
#define LL_DECLARE_DERIVED_UNIT(base_unit, derived_unit, conversion_factor) \
struct derived_unit : public LLUnitType<F64, base_unit, derived_unit> \
{ \
typedef base_unit base_unit_t; \
typedef LLUnitType<F64, base_unit, derived_unit> unit_t; \
typedef F64 storage_t; \
\
derived_unit(value_t value) \
: LLUnitType(value) \
{} \
\
derived_unit() \
{} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
derived_unit(const LLUnitType<SOURCE_STORAGE_TYPE, base_unit, SOURCE_TYPE>& source) \
{ \
setBaseValue((F64)source.base_unit::unit_t::value()); \
} \
\
static F32 conversionToBaseFactor() { return (F32)(conversion_factor); } \
\
using LLUnitType::operator +; \
using LLUnitType::operator +=; \
using LLUnitType::operator -; \
using LLUnitType::operator -=; \
using LLUnitType::operator *; \
using LLUnitType::operator *=; \
using LLUnitType::operator /; \
using LLUnitType::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, Kilobits, (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)));
LL_DECLARE_BASE_UNIT(Meters);
LL_DECLARE_DERIVED_UNIT(Meters, Kilometers, 1000);
LL_DECLARE_DERIVED_UNIT(Meters, Centimeters, 1 / 100);
LL_DECLARE_DERIVED_UNIT(Meters, Millimeters, 1 / 1000);
}
#endif // LL_LLUNIT_H
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