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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"
#include "llerrorlegacy.h"
namespace LLUnits
{
template<typename DERIVED_UNITS_TAG, typename BASE_UNITS_TAG, typename VALUE_TYPE>
struct Convert
{
static VALUE_TYPE get(VALUE_TYPE val)
{
// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
llstatic_assert_template(DERIVED_UNITS_TAG, false, "Cannot convert between types.");
return val;
}
};
template<typename BASE_UNITS_TAG, typename VALUE_TYPE>
struct Convert<BASE_UNITS_TAG, BASE_UNITS_TAG, VALUE_TYPE>
{
static VALUE_TYPE get(VALUE_TYPE val)
{
return val;
}
};
}
template<typename STORAGE_TYPE, typename UNIT_TYPE>
struct LLUnit
{
typedef LLUnit<STORAGE_TYPE, UNIT_TYPE> self_t;
typedef STORAGE_TYPE storage_t;
// value initialization
LLUnit(storage_t value = storage_t())
: mValue(value)
{}
// unit initialization and conversion
template<typename OTHER_STORAGE, typename OTHER_UNIT>
LLUnit(LLUnit<OTHER_STORAGE, OTHER_UNIT> other)
: mValue(convert(other))
{}
bool operator == (const self_t& other)
{
return mValue = other.mValue;
}
// value assignment
self_t& operator = (storage_t value)
{
mValue = value;
return *this;
}
// unit assignment
template<typename OTHER_STORAGE, typename OTHER_UNIT>
self_t& operator = (LLUnit<OTHER_STORAGE, OTHER_UNIT> other)
{
mValue = convert(other);
return *this;
}
storage_t value() const
{
return mValue;
}
template<typename NEW_UNIT_TYPE> LLUnit<STORAGE_TYPE, NEW_UNIT_TYPE> as()
{
return LLUnit<STORAGE_TYPE, NEW_UNIT_TYPE>(*this);
}
void operator += (storage_t value)
{
mValue += value;
}
template<typename OTHER_STORAGE, typename OTHER_UNIT>
void operator += (LLUnit<OTHER_STORAGE, OTHER_UNIT> other)
{
mValue += convert(other);
}
void operator -= (storage_t value)
{
mValue -= value;
}
template<typename OTHER_STORAGE, typename OTHER_UNIT>
void operator -= (LLUnit<OTHER_STORAGE, OTHER_UNIT> other)
{
mValue -= convert(other);
}
void operator *= (storage_t multiplicand)
{
mValue *= multiplicand;
}
template<typename OTHER_UNIT, typename OTHER_STORAGE>
void operator *= (LLUnit<OTHER_STORAGE, OTHER_UNIT> multiplicand)
{
// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
llstatic_assert_template(OTHER_UNIT, false, "Multiplication of unit types not supported.");
}
void operator /= (storage_t divisor)
{
mValue /= divisor;
}
template<typename OTHER_UNIT, typename OTHER_STORAGE>
void operator /= (LLUnit<OTHER_STORAGE, OTHER_UNIT> divisor)
{
// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
llstatic_assert_template(OTHER_UNIT, false, "Illegal in-place division of unit types.");
}
template<typename SOURCE_STORAGE, typename SOURCE_UNITS>
static storage_t convert(LLUnit<SOURCE_STORAGE, SOURCE_UNITS> v)
{
return (storage_t)LLUnits::Convert<typename UNIT_TYPE::base_unit_t, UNIT_TYPE, STORAGE_TYPE>::get((STORAGE_TYPE)
LLUnits::Convert<SOURCE_UNITS, typename UNIT_TYPE::base_unit_t, SOURCE_STORAGE>::get(v.value()));
}
template<typename SOURCE_STORAGE>
static storage_t convert(LLUnit<SOURCE_STORAGE, UNIT_TYPE> v)
{
return (storage_t)(v.value());
}
protected:
storage_t mValue;
};
template<typename STORAGE_TYPE, typename UNIT_TYPE>
struct LLUnitImplicit : public LLUnit<STORAGE_TYPE, UNIT_TYPE>
{
typedef LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> self_t;
typedef typename LLUnit<STORAGE_TYPE, UNIT_TYPE>::storage_t storage_t;
typedef LLUnit<STORAGE_TYPE, UNIT_TYPE> base_t;
LLUnitImplicit(storage_t value = storage_t())
: base_t(value)
{}
template<typename OTHER_STORAGE, typename OTHER_UNIT>
LLUnitImplicit(LLUnit<OTHER_STORAGE, OTHER_UNIT> other)
: base_t(convert(other))
{}
// unlike LLUnit, LLUnitImplicit is *implicitly* convertable to a POD scalar (F32, S32, etc)
// this allows for interoperability with legacy code
operator storage_t() const
{
return base_t::value();
}
};
//
// operator +
//
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnit<STORAGE_TYPE1, UNIT_TYPE1> operator + (LLUnit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
LLUnit<STORAGE_TYPE1, UNIT_TYPE1> result(first);
result += second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator + (LLUnit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
LLUnit<STORAGE_TYPE, UNIT_TYPE> result(first);
result += second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator + (SCALAR_TYPE first, LLUnit<STORAGE_TYPE, UNIT_TYPE> second)
{
LLUnit<STORAGE_TYPE, UNIT_TYPE> result(first);
result += second;
return result;
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> operator + (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> result(first);
result += second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator + (LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> result(first);
result += second;
return result;
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> operator + (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnitImplicit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> result(first);
result += second;
return result;
}
//
// operator -
//
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnit<STORAGE_TYPE1, UNIT_TYPE1> operator - (LLUnit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
LLUnit<STORAGE_TYPE1, UNIT_TYPE1> result(first);
result -= second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator - (LLUnit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
LLUnit<STORAGE_TYPE, UNIT_TYPE> result(first);
result -= second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator - (SCALAR_TYPE first, LLUnit<STORAGE_TYPE, UNIT_TYPE> second)
{
LLUnit<STORAGE_TYPE, UNIT_TYPE> result(first);
result -= second;
return result;
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> operator - (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnitImplicit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> result(first);
result -= second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator - (LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> result(first);
result -= second;
return result;
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator - (SCALAR_TYPE first, LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> second)
{
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> result(first);
result -= second;
return result;
}
//
// operator *
//
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator * (SCALAR_TYPE first, LLUnit<STORAGE_TYPE, UNIT_TYPE> second)
{
return LLUnit<STORAGE_TYPE, UNIT_TYPE>((STORAGE_TYPE)(first * second.value()));
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator * (LLUnit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
return LLUnit<STORAGE_TYPE, UNIT_TYPE>((STORAGE_TYPE)(first.value() * second));
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnit<STORAGE_TYPE1, UNIT_TYPE1> operator * (LLUnit<STORAGE_TYPE1, UNIT_TYPE1>, LLUnit<STORAGE_TYPE2, UNIT_TYPE2>)
{
// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
llstatic_assert_template(STORAGE_TYPE1, false, "Multiplication of unit types results in new unit type - not supported.");
return LLUnit<STORAGE_TYPE1, UNIT_TYPE1>();
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator * (SCALAR_TYPE first, LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> second)
{
return LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE>(first * second.value());
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator * (LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
return LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE>(first.value() * second);
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> operator * (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1>, LLUnitImplicit<STORAGE_TYPE2, UNIT_TYPE2>)
{
// spurious use of dependent type to stop gcc from triggering the static assertion before instantiating the template
llstatic_assert_template(STORAGE_TYPE1, false, "Multiplication of unit types results in new unit type - not supported.");
return LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1>();
}
//
// operator /
//
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
SCALAR_TYPE operator / (SCALAR_TYPE first, LLUnit<STORAGE_TYPE, UNIT_TYPE> second)
{
return SCALAR_TYPE(first / second.value());
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnit<STORAGE_TYPE, UNIT_TYPE> operator / (LLUnit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
return LLUnit<STORAGE_TYPE, UNIT_TYPE>((STORAGE_TYPE)(first.value() / second));
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
STORAGE_TYPE1 operator / (LLUnit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
return STORAGE_TYPE1(first.value() / first.convert(second));
}
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE>
LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> operator / (LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second)
{
return LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE>((STORAGE_TYPE)(first.value() / second));
}
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2>
STORAGE_TYPE1 operator / (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnitImplicit<STORAGE_TYPE2, UNIT_TYPE2> second)
{
return STORAGE_TYPE1(first.value() / first.convert(second));
}
#define COMPARISON_OPERATORS(op) \
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE> \
bool operator op (SCALAR_TYPE first, LLUnit<STORAGE_TYPE, UNIT_TYPE> second) \
{ \
return first op second.value(); \
} \
\
template<typename STORAGE_TYPE, typename UNIT_TYPE, typename SCALAR_TYPE> \
bool operator op (LLUnit<STORAGE_TYPE, UNIT_TYPE> first, SCALAR_TYPE second) \
{ \
return first.value() op second; \
} \
\
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2> \
bool operator op (LLUnitImplicit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnitImplicit<STORAGE_TYPE2, UNIT_TYPE2> second) \
{ \
return first.value() op first.convert(second); \
} \
\
template<typename STORAGE_TYPE1, typename UNIT_TYPE1, typename STORAGE_TYPE2, typename UNIT_TYPE2> \
bool operator op (LLUnit<STORAGE_TYPE1, UNIT_TYPE1> first, LLUnit<STORAGE_TYPE2, UNIT_TYPE2> second) \
{ \
return first.value() op first.convert(second); \
}
COMPARISON_OPERATORS(<)
COMPARISON_OPERATORS(<=)
COMPARISON_OPERATORS(>)
COMPARISON_OPERATORS(>=)
COMPARISON_OPERATORS(==)
COMPARISON_OPERATORS(!=)
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(); }
};
//
// Unit declarations
//
namespace LLUnits
{
template<typename VALUE_TYPE>
struct LinearOps
{
typedef LinearOps<VALUE_TYPE> self_t;
LinearOps(VALUE_TYPE val) : mValue (val) {}
operator VALUE_TYPE() const { return mValue; }
VALUE_TYPE mValue;
template<typename T>
self_t operator * (T other)
{
return mValue * other;
}
template<typename T>
self_t operator / (T other)
{
return mValue / other;
}
template<typename T>
self_t operator + (T other)
{
return mValue + other;
}
template<typename T>
self_t operator - (T other)
{
return mValue - other;
}
};
template<typename VALUE_TYPE>
struct InverseLinearOps
{
typedef InverseLinearOps<VALUE_TYPE> self_t;
InverseLinearOps(VALUE_TYPE val) : mValue (val) {}
operator VALUE_TYPE() const { return mValue; }
VALUE_TYPE mValue;
template<typename T>
self_t operator * (T other)
{
return mValue / other;
}
template<typename T>
self_t operator / (T other)
{
return mValue * other;
}
template<typename T>
self_t operator + (T other)
{
return mValue - other;
}
template<typename T>
self_t operator - (T other)
{
return mValue + other;
}
};
template<typename T>
T storageValue(T val) { return val; }
template<typename UNIT_TYPE, typename STORAGE_TYPE>
STORAGE_TYPE storageValue(LLUnit<STORAGE_TYPE, UNIT_TYPE> val) { return val.value(); }
template<typename UNIT_TYPE, typename STORAGE_TYPE>
STORAGE_TYPE storageValue(LLUnitImplicit<STORAGE_TYPE, UNIT_TYPE> val) { return val.value(); }
#define LL_DECLARE_BASE_UNIT(base_unit_name, unit_label) \
struct base_unit_name { typedef base_unit_name base_unit_t; static const char* getUnitLabel() { return unit_label; }}
#define LL_DECLARE_DERIVED_UNIT(unit_name, unit_label, base_unit_name, conversion_operation) \
struct unit_name \
{ \
typedef base_unit_name base_unit_t; \
static const char* getUnitLabel() { return unit_label; } \
}; \
template<typename STORAGE_TYPE> \
struct Convert<unit_name, base_unit_name, STORAGE_TYPE> \
{ \
static STORAGE_TYPE get(STORAGE_TYPE val) \
{ \
return (LinearOps<STORAGE_TYPE>(val) conversion_operation).mValue; \
} \
}; \
\
template<typename STORAGE_TYPE> \
struct Convert<base_unit_name, unit_name, STORAGE_TYPE> \
{ \
static STORAGE_TYPE get(STORAGE_TYPE val) \
{ \
return (InverseLinearOps<STORAGE_TYPE>(val) conversion_operation).mValue; \
} \
}
LL_DECLARE_BASE_UNIT(Bytes, "B");
LL_DECLARE_DERIVED_UNIT(Kilobytes, "KB", Bytes, * 1000);
LL_DECLARE_DERIVED_UNIT(Megabytes, "MB", Bytes, * 1000 * 1000);
LL_DECLARE_DERIVED_UNIT(Gigabytes, "GB", Bytes, * 1000 * 1000 * 1000);
LL_DECLARE_DERIVED_UNIT(Kibibytes, "KiB", Bytes, * 1024);
LL_DECLARE_DERIVED_UNIT(Mibibytes, "MiB", Bytes, * 1024 * 1024);
LL_DECLARE_DERIVED_UNIT(Gibibytes, "GiB", Bytes, * 1024 * 1024 * 1024);
LL_DECLARE_DERIVED_UNIT(Bits, "b", Bytes, / 8);
LL_DECLARE_DERIVED_UNIT(Kilobits, "Kb", Bytes, * (1000 / 8));
LL_DECLARE_DERIVED_UNIT(Megabits, "Mb", Bytes, * (1000 / 8));
LL_DECLARE_DERIVED_UNIT(Gigabits, "Gb", Bytes, * (1000 * 1000 * 1000 / 8));
LL_DECLARE_DERIVED_UNIT(Kibibits, "Kib", Bytes, * (1024 / 8));
LL_DECLARE_DERIVED_UNIT(Mibibits, "Mib", Bytes, * (1024 / 8));
LL_DECLARE_DERIVED_UNIT(Gibibits, "Gib", Bytes, * (1024 * 1024 * 1024 / 8));
LL_DECLARE_BASE_UNIT(Seconds, "s");
LL_DECLARE_DERIVED_UNIT(Minutes, "min", Seconds, * 60);
LL_DECLARE_DERIVED_UNIT(Hours, "h", Seconds, * 60 * 60);
LL_DECLARE_DERIVED_UNIT(Milliseconds, "ms", Seconds, / 1000);
LL_DECLARE_DERIVED_UNIT(Microseconds, "\x09\x3cs", Seconds, / 1000000);
LL_DECLARE_DERIVED_UNIT(Nanoseconds, "ns", Seconds, / 1000000000);
LL_DECLARE_BASE_UNIT(Meters, "m");
LL_DECLARE_DERIVED_UNIT(Kilometers, "km", Meters, * 1000);
LL_DECLARE_DERIVED_UNIT(Centimeters, "cm", Meters, * 100);
LL_DECLARE_DERIVED_UNIT(Millimeters, "mm", Meters, * 1000);
LL_DECLARE_BASE_UNIT(Hertz, "Hz");
LL_DECLARE_DERIVED_UNIT(Kilohertz, "KHz", Hertz, * 1000);
LL_DECLARE_DERIVED_UNIT(Megahertz, "MHz", Hertz, * 1000 * 1000);
LL_DECLARE_DERIVED_UNIT(Gigahertz, "GHz", Hertz, * 1000 * 1000 * 1000);
LL_DECLARE_BASE_UNIT(Radians, "rad");
LL_DECLARE_DERIVED_UNIT(Degrees, "deg", Radians, * 0.01745329251994);
} // namespace LLUnits
#endif // LL_LLUNIT_H
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