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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 STORAGE_TYPE storage_t;
typedef void is_unit_tag_t;
LLUnitType()
{}
LLUnitType(storage_t value)
: BASE_UNIT(convertToBase(value))
{}
// implicit downcast
operator unit_t& ()
{
return static_cast<unit_t&>(*this);
}
operator storage_t () const
{
return value();
}
storage_t value() const
{
return convertToDerived(mBaseValue);
}
template<typename CONVERTED_TYPE>
storage_t as() const
{
return CONVERTED_TYPE(*this).value();
}
protected:
static storage_t convertToBase(storage_t derived_value)
{
return (storage_t)((F32)derived_value * unit_t::conversionToBaseFactor());
}
static storage_t convertToDerived(storage_t base_value)
{
return (storage_t)((F32)base_value / unit_t::conversionToBaseFactor());
}
};
template<typename STORAGE_TYPE, typename T>
struct LLUnitType<STORAGE_TYPE, T, T>
{
typedef T unit_t;
typedef STORAGE_TYPE storage_t;
typedef void is_unit_tag_t;
LLUnitType()
: mBaseValue()
{}
LLUnitType(storage_t value)
: mBaseValue(value)
{}
unit_t& operator=(storage_t value)
{
setBaseValue(value);
return *this;
}
//implicit downcast
operator unit_t& ()
{
return static_cast<unit_t&>(*this);
}
operator storage_t () const
{
return value();
}
storage_t value() const { return mBaseValue; }
template<typename CONVERTED_TYPE>
storage_t as() const
{
return CONVERTED_TYPE(*this).value();
}
static storage_t convertToBase(storage_t derived_value)
{
return (storage_t)derived_value;
}
static storage_t convertToDerived(storage_t base_value)
{
return (storage_t)base_value;
}
void operator += (const unit_t other)
{
mBaseValue += other.mBaseValue;
}
void operator -= (const unit_t other)
{
mBaseValue -= other.mBaseValue;
}
void operator *= (storage_t multiplicand)
{
mBaseValue *= multiplicand;
}
void operator /= (storage_t divisor)
{
mBaseValue /= divisor;
}
protected:
void setBaseValue(storage_t value)
{
mBaseValue = value;
}
storage_t mBaseValue;
};
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
struct LLUnitTypeWrapper
: public LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>
{
typedef LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> unit_t;
LLUnitTypeWrapper(const unit_t& other)
: unit_t(other)
{}
};
//
// operator +
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT, typename STORAGE_TYPE2, typename BASE_UNIT2, typename DERIVED_UNIT2>
DERIVED_UNIT operator + (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE2, BASE_UNIT2, DERIVED_UNIT2> second)
{
return DERIVED_UNIT(first + LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>(second).value());
}
//
// operator -
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT, typename STORAGE_TYPE2, typename BASE_UNIT2, typename DERIVED_UNIT2>
DERIVED_UNIT operator - (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return DERIVED_UNIT(first - LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>(second).value());
}
//
// operator *
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
DERIVED_UNIT operator * (STORAGE_TYPE first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return DERIVED_UNIT(first * second.value());
}
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
DERIVED_UNIT operator * (LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> first, STORAGE_TYPE second)
{
return DERIVED_UNIT(first.value() * second);
}
//
// operator /
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
DERIVED_UNIT operator / (STORAGE_TYPE first, LLUnitTypeWrapper<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return DERIVED_UNIT(first / second.value());
}
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
DERIVED_UNIT operator / (LLUnitTypeWrapper<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> first, STORAGE_TYPE second)
{
return DERIVED_UNIT(first.value() / second);
}
//
// operator <
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT, typename STORAGE_TYPE2, typename BASE_UNIT2, typename DERIVED_UNIT2>
bool operator < (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first < second.value();
}
//
// operator <=
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
bool operator <= (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first <= second.value();
}
//
// operator >
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
bool operator > (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first > second.value();
}
//
// operator >=
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
bool operator >= (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first >= second.value();
}
//
// operator ==
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
bool operator == (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first == second.value();
}
//
// operator !=
//
template<typename STORAGE_TYPE, typename BASE_UNIT, typename DERIVED_UNIT>
bool operator != (typename LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT>::storage_t first, LLUnitType<STORAGE_TYPE, BASE_UNIT, DERIVED_UNIT> second)
{
return first != second.value();
}
#define LL_DECLARE_BASE_UNIT(unit_name) \
template<typename STORAGE> \
struct unit_name : public LLUnitType<STORAGE, unit_name<STORAGE>, unit_name<STORAGE> > \
{ \
typedef LLUnitType<STORAGE, unit_name> unit_t; \
\
unit_name(storage_t value = 0) \
: LLUnitType(value) \
{} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
unit_name(LLUnitType<SOURCE_STORAGE_TYPE, unit_name<SOURCE_STORAGE_TYPE>, SOURCE_TYPE> source) \
{ \
assignFrom(source); \
} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
void assignFrom(LLUnitType<SOURCE_STORAGE_TYPE, unit_name<SOURCE_STORAGE_TYPE>, SOURCE_TYPE> source) \
{ \
setBaseValue((storage_t)source.unit_name<SOURCE_STORAGE_TYPE>::unit_t::value()); \
} \
\
}; \
#define LL_DECLARE_DERIVED_UNIT(base_unit, derived_unit, conversion_factor) \
template<typename STORAGE> \
struct derived_unit : public LLUnitType<STORAGE, base_unit<STORAGE>, derived_unit<STORAGE> > \
{ \
typedef LLUnitType<STORAGE, base_unit<STORAGE>, derived_unit<STORAGE> > unit_t; \
\
derived_unit(storage_t value = 0) \
: LLUnitType(value) \
{} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
derived_unit(LLUnitType<SOURCE_STORAGE_TYPE, base_unit<SOURCE_STORAGE_TYPE>, SOURCE_TYPE> source) \
{ \
assignFrom(source); \
} \
\
template <typename SOURCE_STORAGE_TYPE, typename SOURCE_TYPE> \
void assignFrom(LLUnitType<SOURCE_STORAGE_TYPE, base_unit<SOURCE_STORAGE_TYPE>, SOURCE_TYPE> source) \
{ \
setBaseValue((storage_t)source.base_unit<SOURCE_STORAGE_TYPE>::unit_t::value()); \
} \
\
static F32 conversionToBaseFactor() { return (F32)(conversion_factor); } \
\
}; \
namespace LLUnit
{
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
|
