File indexing completed on 2024-05-12 05:55:19
0001 // This file is part of the SpeedCrunch project 0002 // Copyright (C) 2015 Pol Welter <polwelter@gmail.com> 0003 // Copyright (C) 2016 @heldercorreia 0004 // 0005 // This program is free software; you can redistribute it and/or 0006 // modify it under the terms of the GNU General Public License 0007 // as published by the Free Software Foundation; either version 2 0008 // of the License, or (at your option) any later version. 0009 // 0010 // This program is distributed in the hope that it will be useful, 0011 // but WITHOUT ANY WARRANTY; without even the implied warranty of 0012 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 0013 // GNU General Public License for more details. 0014 // 0015 // You should have received a copy of the GNU General Public License 0016 // along with this program; see the file COPYING. If not, write to 0017 // the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, 0018 // Boston, MA 02110-1301, USA. 0019 0020 #include "units.h" 0021 0022 #include "quantity.h" 0023 #include "rational.h" 0024 0025 #include <QLocale> 0026 #include <QString> 0027 #include <QStringList> 0028 0029 // TODO: find out how to get gettext to recognize these (or write a xgettext 0030 // replacement that actually supports C++ properly...) 0031 #define UNIT_CACHE(name, value) \ 0032 const Quantity Units::name() \ 0033 { \ 0034 if (!m_cache.contains(#name)) \ 0035 m_cache[#name] = value; \ 0036 return (m_cache[#name]); \ 0037 } 0038 0039 #define BASE_UNIT_CACHE(name, dimension) \ 0040 const Quantity Units::name() \ 0041 { \ 0042 if (!m_cache.contains(#name)) { \ 0043 Quantity name(1); \ 0044 name.modifyDimension(dimension, 1); \ 0045 m_cache[#name] = name; \ 0046 } \ 0047 return m_cache[#name]; \ 0048 } 0049 0050 QHash<QMap<QString, Rational>, Unit> Units::m_matchLookup; 0051 QMap<QString, Quantity> Units::m_cache; 0052 0053 0054 void Units::pushUnit(Quantity q, QString name) 0055 { 0056 q.cleanDimension(); 0057 Unit u(name, q); 0058 m_matchLookup.insert(q.getDimension(), u); 0059 } 0060 0061 unsigned int qHash(QMap<QString, Rational> dimension) 0062 { 0063 QStringList keyList(dimension.keys()); 0064 QString blob(""); 0065 keyList.sort(); 0066 for (int i = 0; i < keyList.size(); ++i) { 0067 keyList[i].append(dimension[keyList[i]].toString()); 0068 blob.append(keyList[i]); 0069 } 0070 return qHash(blob); 0071 } 0072 0073 /* 0074 * initialize the lookup table for automatic matching 0075 */ 0076 void Units::initTable() 0077 { 0078 m_matchLookup.clear(); 0079 pushUnit(joule(), "newton meter"); // energy or torque 0080 pushUnit(newton(), "newton"); // force 0081 pushUnit(watt(), "watt"); // power 0082 pushUnit(pascal(), "pascal"); // pressure or energy density 0083 pushUnit(coulomb(), "coulomb"); // charge 0084 pushUnit(volt(), "volt"); // electrical potential 0085 pushUnit(ohm(), "ohm"); // el. resistance 0086 pushUnit(siemens(), "siemens"); // el. conductance 0087 pushUnit(ohm()*meter(), "ohm meter"); // el. resistivity 0088 pushUnit(siemens()/meter(), "siemens/meter"); // el. conductivity 0089 pushUnit(siemens()/meter()/mole(), "siemens/(meter mole)"); // molar conductivity 0090 pushUnit(farad(), "farad"); // capacitance 0091 pushUnit(tesla(), "tesla"); // magnetic flux density 0092 pushUnit(weber(), "weber"); // magnetic flux 0093 pushUnit(henry(), "henry"); // inductance 0094 pushUnit(coulomb()/cbmeter(), "coulomb/meter³"); // electric charge density 0095 pushUnit(coulomb()/sqmeter(), "coulomb/meter²"); // surface charge density or el. flux 0096 pushUnit(coulomb()/kilogram(), "coulomb/kilogram"); // exposure 0097 pushUnit(farad()/meter(), "farad/meter"); // permittivity 0098 pushUnit(henry()/meter(), "henry/meter"); // permeability 0099 pushUnit(joule()/kilogram()/kelvin(),"joule/(kilogram kelvin)"); // specific heat capacity 0100 pushUnit(joule()/mole()/kelvin(), "joule/(mole kelvin"); // molar heat capacity 0101 pushUnit(mole()/second()/cbmeter(), "mole/(second meter³)"); // catalytic activity 0102 pushUnit(newton()/meter(), "newton/meter"); // surface tension 0103 pushUnit(pascal()*second(), "pascal second"); // dynamic viscosity 0104 pushUnit(volt()/meter(), "volt/meter"); // el. field 0105 pushUnit(watt()/meter()/kelvin(), "watt/(meter kelvin)"); // thermal conductivity 0106 pushUnit(watt()/sqmeter(), "watt/meter²"); // heat flux 0107 pushUnit(joule()/kelvin(), "joule/kelvin"); // entropy or heat capacity 0108 pushUnit(joule()/kilogram(), "joule/kilogram"); // specific energy 0109 } 0110 0111 void Units::findUnit(Quantity& q) 0112 { 0113 QString unit_name = ""; 0114 CNumber unit(1); 0115 q.cleanDimension(); 0116 0117 if (m_matchLookup.isEmpty()) 0118 initTable(); 0119 0120 // Match derived units. 0121 if (m_matchLookup.contains(q.getDimension())) { 0122 Unit temp(m_matchLookup[q.getDimension()]); 0123 q.setDisplayUnit(temp.value.numericValue(), temp.name); 0124 } else { 0125 // Autogenerate unit name (product of base units). 0126 QMap<QString, Rational> dimension = q.getDimension(); 0127 QMap<QString, Rational>::const_iterator i = dimension.constBegin(); 0128 while (i != dimension.constEnd()) { 0129 QString exponent = i.value().toString(); 0130 if (exponent.contains('/')) 0131 exponent = "^(" + exponent+')'; 0132 else if (exponent == "1") 0133 exponent = ""; 0134 else 0135 exponent = '^' + exponent; 0136 0137 if (exponent == QLatin1String("^0")) exponent = QString::fromUtf8("⁰"); 0138 else if (exponent == QLatin1String("^2")) exponent = QString::fromUtf8("²"); 0139 else if (exponent == QLatin1String("^3")) exponent = QString::fromUtf8("³"); 0140 else if (exponent == QLatin1String("^4")) exponent = QString::fromUtf8("⁴") ; 0141 else if (exponent == QLatin1String("^5")) exponent = QString::fromUtf8("⁵") ; 0142 else if (exponent == QLatin1String("^6")) exponent = QString::fromUtf8("⁶") ; 0143 else if (exponent == QLatin1String("^7")) exponent = QString::fromUtf8("⁷") ; 0144 else if (exponent == QLatin1String("^8")) exponent = QString::fromUtf8("⁸") ; 0145 else if (exponent == QLatin1String("^9")) exponent = QString::fromUtf8("⁹") ; 0146 else if (exponent == QLatin1String("^-1")) exponent = QString::fromUtf8("⁻¹"); 0147 else if (exponent == QLatin1String("^-2")) exponent = QString::fromUtf8("⁻²"); 0148 else if (exponent == QLatin1String("^-3")) exponent = QString::fromUtf8("⁻³"); 0149 else if (exponent == QLatin1String("^-4")) exponent = QString::fromUtf8("⁻⁴") ; 0150 else if (exponent == QLatin1String("^-5")) exponent = QString::fromUtf8("⁻⁵") ; 0151 else if (exponent == QLatin1String("^-6")) exponent = QString::fromUtf8("⁻⁶") ; 0152 else if (exponent == QLatin1String("^-7")) exponent = QString::fromUtf8("⁻⁷") ; 0153 else if (exponent == QLatin1String("^-8")) exponent = QString::fromUtf8("⁻⁸") ; 0154 else if (exponent == QLatin1String("^-9")) exponent = QString::fromUtf8("⁻⁹") ; 0155 0156 // TODO: Replace this with a lookup to a repository. 0157 if (i.key() == "length") 0158 unit_name += " meter"; 0159 else if (i.key() == "time") 0160 unit_name += " second"; 0161 else if (i.key() == "mass") 0162 unit_name += " kilogram"; 0163 else if (i.key() == "el. current") 0164 unit_name += " ampere"; 0165 else if (i.key() == "amount") 0166 unit_name += " mole"; 0167 else if (i.key() == "luminous intensity") 0168 unit_name += " candela"; 0169 else if (i.key() == "temperature") 0170 unit_name += " kelvin"; 0171 else if (i.key() == "information") { 0172 unit_name += " bit"; 0173 } else 0174 unit_name += " " + i.key(); // fall back to the dimension name 0175 unit_name += exponent; 0176 ++i; 0177 } 0178 q.setDisplayUnit(unit, unit_name.trimmed()); 0179 } 0180 } 0181 0182 #define ADD_UNIT(name) result.append(Unit(#name, name())) 0183 #define ADD_UNIT_ALIAS(name, alias) result.append(Unit(#alias, name())) 0184 0185 // This list contains the units that wil be set as builtin variables by the evaluator. 0186 const QList<Unit> Units::getList() 0187 { 0188 QList<Unit> result; 0189 0190 ADD_UNIT(meter); 0191 ADD_UNIT_ALIAS(meter, meters); 0192 ADD_UNIT(second); 0193 ADD_UNIT_ALIAS(second, seconds); 0194 ADD_UNIT(kilogram); 0195 ADD_UNIT_ALIAS(kilogram, kilograms); 0196 ADD_UNIT(ampere); 0197 ADD_UNIT_ALIAS(ampere, amperes); 0198 ADD_UNIT(mole); 0199 ADD_UNIT(candela); 0200 ADD_UNIT(kelvin); 0201 ADD_UNIT(bit); 0202 0203 ADD_UNIT(yocto); 0204 ADD_UNIT(zepto); 0205 ADD_UNIT(atto); 0206 ADD_UNIT(femto); 0207 ADD_UNIT(pico); 0208 ADD_UNIT(nano); 0209 ADD_UNIT(micro); 0210 ADD_UNIT(milli); 0211 ADD_UNIT(centi); 0212 ADD_UNIT(deci); 0213 ADD_UNIT(deca); 0214 ADD_UNIT(hecto); 0215 ADD_UNIT(kilo); 0216 ADD_UNIT(mega); 0217 ADD_UNIT(giga); 0218 ADD_UNIT(tera); 0219 ADD_UNIT(peta); 0220 ADD_UNIT(exa); 0221 ADD_UNIT(zetta); 0222 ADD_UNIT(yotta); 0223 ADD_UNIT(kibi); 0224 ADD_UNIT(mebi); 0225 ADD_UNIT(gibi); 0226 ADD_UNIT(tebi); 0227 ADD_UNIT(pebi); 0228 ADD_UNIT(exbi); 0229 ADD_UNIT(zebi); 0230 ADD_UNIT(yobi); 0231 0232 ADD_UNIT(sqmeter); 0233 ADD_UNIT(cbmeter); 0234 ADD_UNIT(newton); 0235 ADD_UNIT(hertz); 0236 ADD_UNIT(joule); 0237 ADD_UNIT(watt); 0238 ADD_UNIT(pascal); 0239 ADD_UNIT(coulomb); 0240 ADD_UNIT(volt); 0241 ADD_UNIT(ohm); 0242 ADD_UNIT(farad); 0243 ADD_UNIT(tesla); 0244 ADD_UNIT(weber); 0245 ADD_UNIT(henry); 0246 ADD_UNIT(siemens); 0247 ADD_UNIT(becquerel); 0248 ADD_UNIT(gray); 0249 ADD_UNIT(sievert); 0250 ADD_UNIT(katal); 0251 ADD_UNIT(steradian); 0252 ADD_UNIT(lumen); 0253 ADD_UNIT(lux); 0254 0255 ADD_UNIT(metric_ton); 0256 ADD_UNIT(short_ton); 0257 ADD_UNIT(long_ton); 0258 ADD_UNIT(pound); 0259 ADD_UNIT(ounce); 0260 ADD_UNIT(grain); 0261 ADD_UNIT(gram); 0262 ADD_UNIT(atomic_mass_unit); 0263 ADD_UNIT(carat); 0264 0265 ADD_UNIT(micron); 0266 ADD_UNIT(angstrom); 0267 ADD_UNIT(astronomical_unit); 0268 ADD_UNIT(lightyear); 0269 ADD_UNIT(lightsecond); 0270 ADD_UNIT(lightminute); 0271 ADD_UNIT(parsec); 0272 ADD_UNIT(inch); 0273 ADD_UNIT(foot); 0274 ADD_UNIT_ALIAS(foot, feet); 0275 ADD_UNIT(yard); 0276 ADD_UNIT_ALIAS(yard, yards); 0277 ADD_UNIT(mile); 0278 ADD_UNIT_ALIAS(mile, miles); 0279 ADD_UNIT(rod); 0280 ADD_UNIT(furlong); 0281 ADD_UNIT(fathom); 0282 ADD_UNIT(nautical_mile); 0283 ADD_UNIT(cable); 0284 0285 ADD_UNIT(UK_gallon); 0286 ADD_UNIT(US_gallon); 0287 ADD_UNIT_ALIAS(US_gallon, gallon_US); 0288 ADD_UNIT_ALIAS(UK_gallon, gallon_UK); 0289 ADD_UNIT_ALIAS(UK_gallon, imperial_gallon); 0290 ADD_UNIT(UK_quart); 0291 ADD_UNIT(US_quart); 0292 ADD_UNIT_ALIAS(US_quart, quart_US); 0293 ADD_UNIT_ALIAS(UK_quart, quart_UK); 0294 ADD_UNIT(UK_pint); 0295 ADD_UNIT(US_pint); 0296 ADD_UNIT_ALIAS(US_pint, pint_US); 0297 ADD_UNIT_ALIAS(UK_pint, pint_UK); 0298 ADD_UNIT(UK_fluid_ounce); 0299 ADD_UNIT(US_fluid_ounce); 0300 ADD_UNIT_ALIAS(US_fluid_ounce, us_fl_oz); 0301 ADD_UNIT_ALIAS(US_fluid_ounce, us_floz); 0302 ADD_UNIT_ALIAS(US_fluid_ounce, fluid_ounce_US); 0303 ADD_UNIT_ALIAS(UK_fluid_ounce, uk_fl_oz); 0304 ADD_UNIT_ALIAS(UK_fluid_ounce, uk_floz); 0305 ADD_UNIT_ALIAS(UK_fluid_ounce, fluid_ounce_UK); 0306 ADD_UNIT(liter); 0307 ADD_UNIT_ALIAS(liter, litre); 0308 ADD_UNIT_ALIAS(liter, liters); 0309 ADD_UNIT_ALIAS(liter, litres); 0310 0311 // Time 0312 ADD_UNIT(minute); 0313 ADD_UNIT_ALIAS(minute, minutes); 0314 0315 ADD_UNIT(hour); 0316 ADD_UNIT_ALIAS(hour, hours); 0317 ADD_UNIT_ALIAS(hour, h); // so sue me 0318 0319 ADD_UNIT(day); 0320 ADD_UNIT_ALIAS(day, days); 0321 0322 ADD_UNIT(week); 0323 ADD_UNIT_ALIAS(week, weeks); 0324 0325 ADD_UNIT(julian_year); 0326 ADD_UNIT(tropical_year); 0327 ADD_UNIT(sidereal_year); 0328 ADD_UNIT_ALIAS(julian_year, year_julian); 0329 ADD_UNIT_ALIAS(tropical_year, year_tropical); 0330 ADD_UNIT_ALIAS(sidereal_year, year_sidereal); 0331 0332 ADD_UNIT(percent); 0333 ADD_UNIT(ppm); 0334 ADD_UNIT(ppb); 0335 ADD_UNIT(karat); 0336 0337 ADD_UNIT(bar); 0338 ADD_UNIT(atmosphere); 0339 ADD_UNIT(torr); 0340 ADD_UNIT(pounds_per_sqinch); 0341 0342 ADD_UNIT(electron_volt); 0343 ADD_UNIT(calorie); 0344 ADD_UNIT(british_thermal_unit); 0345 0346 ADD_UNIT(nat); 0347 ADD_UNIT(hartley); 0348 ADD_UNIT(byte); 0349 ADD_UNIT_ALIAS(byte, bytes); 0350 0351 ADD_UNIT(exabyte); 0352 ADD_UNIT(terabyte); 0353 ADD_UNIT(gigabyte); 0354 ADD_UNIT(megabyte); 0355 ADD_UNIT(kilobyte); 0356 ADD_UNIT_ALIAS(exabyte, exabytes); 0357 ADD_UNIT_ALIAS(terabyte, terabytes); 0358 ADD_UNIT_ALIAS(gigabyte, gigabytes); 0359 ADD_UNIT_ALIAS(megabyte, megabytes); 0360 ADD_UNIT_ALIAS(kilobyte, kilobytes); 0361 0362 ADD_UNIT(exbibyte); 0363 ADD_UNIT(tebibyte); 0364 ADD_UNIT(gibibyte); 0365 ADD_UNIT(mebibyte); 0366 ADD_UNIT(kibibyte); 0367 ADD_UNIT_ALIAS(exbibyte, exbibytes); 0368 ADD_UNIT_ALIAS(tebibyte, tebibytes); 0369 ADD_UNIT_ALIAS(gibibyte, gibibytes); 0370 ADD_UNIT_ALIAS(mebibyte, mebibytes); 0371 ADD_UNIT_ALIAS(kibibyte, kibibytes); 0372 ADD_UNIT_ALIAS(exbibyte, eb); 0373 ADD_UNIT_ALIAS(tebibyte, tb); 0374 ADD_UNIT_ALIAS(gibibyte, gb); 0375 ADD_UNIT_ALIAS(mebibyte, mb); 0376 ADD_UNIT_ALIAS(kibibyte, kb); 0377 0378 ADD_UNIT(bps); 0379 ADD_UNIT(tbps); 0380 ADD_UNIT(gbps); 0381 ADD_UNIT(mbps); 0382 ADD_UNIT(kbps); 0383 0384 ADD_UNIT(tablespoon); 0385 ADD_UNIT_ALIAS(tablespoon, tablespoons); 0386 ADD_UNIT(teaspoon); 0387 ADD_UNIT_ALIAS(teaspoon, teaspoons); 0388 ADD_UNIT(cup); 0389 ADD_UNIT_ALIAS(cup, cups); 0390 0391 ADD_UNIT(gravity); 0392 ADD_UNIT_ALIAS(gravity, force); 0393 ADD_UNIT(speed_of_light); 0394 ADD_UNIT(speed_of_sound_STP); 0395 ADD_UNIT(elementary_charge); 0396 ADD_UNIT(knot); 0397 ADD_UNIT(horsepower); 0398 0399 switch(QLocale::system().measurementSystem()) { 0400 case QLocale::ImperialUSSystem: 0401 ADD_UNIT_ALIAS(US_pint, pint); 0402 ADD_UNIT_ALIAS(US_gallon, gallon); 0403 ADD_UNIT_ALIAS(US_quart, quart); 0404 ADD_UNIT_ALIAS(US_pint, pint); 0405 ADD_UNIT_ALIAS(US_fluid_ounce, fl_oz); 0406 ADD_UNIT_ALIAS(US_fluid_ounce, floz); 0407 break; 0408 case QLocale::ImperialUKSystem: 0409 ADD_UNIT_ALIAS(UK_pint, pint); 0410 ADD_UNIT_ALIAS(UK_gallon, gallon); 0411 ADD_UNIT_ALIAS(UK_quart, quart); 0412 ADD_UNIT_ALIAS(UK_pint, pint); 0413 ADD_UNIT_ALIAS(UK_fluid_ounce, fl_oz); 0414 ADD_UNIT_ALIAS(UK_fluid_ounce, floz); 0415 break; 0416 default: 0417 break; 0418 } 0419 0420 return result; 0421 } 0422 0423 BASE_UNIT_CACHE(meter, "length") 0424 BASE_UNIT_CACHE(second, "time") 0425 BASE_UNIT_CACHE(kilogram, "mass") 0426 BASE_UNIT_CACHE(ampere, "el. current") 0427 BASE_UNIT_CACHE(mole, "amount") 0428 BASE_UNIT_CACHE(kelvin, "temperature") 0429 BASE_UNIT_CACHE(candela, "luminous intensity") 0430 BASE_UNIT_CACHE(bit, "information") 0431 0432 UNIT_CACHE(yocto, HNumber("1e-24")) 0433 UNIT_CACHE(zepto, HNumber("1e-21")) 0434 UNIT_CACHE(atto, HNumber("1e-18")) 0435 UNIT_CACHE(femto, HNumber("1e-15")) 0436 UNIT_CACHE(pico, HNumber("1e-12")) 0437 UNIT_CACHE(nano, HNumber("1e-9")) 0438 UNIT_CACHE(micro, HNumber("1e-6")) 0439 UNIT_CACHE(milli, HNumber("1e-3")) 0440 UNIT_CACHE(centi, HNumber("1e-2")) 0441 UNIT_CACHE(deci, HNumber("1e-1")) 0442 0443 UNIT_CACHE(deca, HNumber("1e1")) 0444 UNIT_CACHE(hecto, HNumber("1e2")) 0445 UNIT_CACHE(kilo, HNumber("1e3")) 0446 UNIT_CACHE(mega, HNumber("1e6")) 0447 UNIT_CACHE(giga, HNumber("1e9")) 0448 UNIT_CACHE(tera, HNumber("1e12")) 0449 UNIT_CACHE(peta, HNumber("1e15")) 0450 UNIT_CACHE(exa, HNumber("1e18")) 0451 UNIT_CACHE(zetta, HNumber("1e21")) 0452 UNIT_CACHE(yotta, HNumber("1e24")) 0453 0454 UNIT_CACHE(kibi, HNumber("1024")) 0455 UNIT_CACHE(mebi, kibi()*kibi()) 0456 UNIT_CACHE(gibi, kibi()*mebi()) 0457 UNIT_CACHE(tebi, kibi()*gibi()) 0458 UNIT_CACHE(pebi, kibi()*tebi()) 0459 UNIT_CACHE(exbi, kibi()*pebi()) 0460 UNIT_CACHE(zebi, kibi()*exbi()) 0461 UNIT_CACHE(yobi, kibi()*zebi()) 0462 0463 UNIT_CACHE(newton, meter() * kilogram() / (second()*second())) 0464 UNIT_CACHE(hertz, Quantity(1) / second()) 0465 UNIT_CACHE(pascal, newton() / sqmeter()) 0466 UNIT_CACHE(joule, newton() * meter()) 0467 UNIT_CACHE(watt, joule() / second()) 0468 UNIT_CACHE(coulomb, ampere() * second()) 0469 UNIT_CACHE(volt, watt() / ampere()) 0470 UNIT_CACHE(farad, coulomb() / volt()) 0471 UNIT_CACHE(ohm, volt() / ampere()) 0472 UNIT_CACHE(siemens, ampere() / volt()) 0473 UNIT_CACHE(weber, volt() * second()) 0474 UNIT_CACHE(tesla, weber() / sqmeter()) 0475 UNIT_CACHE(henry, weber() / ampere()) 0476 UNIT_CACHE(becquerel, Quantity(1) / second()) 0477 UNIT_CACHE(gray, joule() / kilogram()) 0478 UNIT_CACHE(sievert, joule() / kilogram()) 0479 UNIT_CACHE(katal, mole() / second()) 0480 UNIT_CACHE(steradian, 1) 0481 UNIT_CACHE(lumen, candela()*steradian()) 0482 UNIT_CACHE(lux, lumen()/sqmeter()) 0483 0484 UNIT_CACHE(sqmeter, meter() * meter()) 0485 UNIT_CACHE(cbmeter, sqmeter() * meter()) 0486 0487 UNIT_CACHE(metric_ton, mega()*gram()) 0488 UNIT_CACHE(gram, milli()*kilogram()) 0489 UNIT_CACHE(pound, HNumber("0.45359237") * kilogram()) 0490 UNIT_CACHE(ounce, pound() / HNumber(16)) 0491 UNIT_CACHE(grain, pound() / HNumber(7000)) 0492 UNIT_CACHE(short_ton, HNumber(2000) * pound()) 0493 UNIT_CACHE(long_ton, HNumber(2240) * pound()) 0494 UNIT_CACHE(atomic_mass_unit, HNumber("1.660539040e-27") * kilogram()) // http://physics.nist.gov/cgi-bin/cuu/Value?tukg 0495 UNIT_CACHE(carat, HNumber(200) * milli()*gram()) // Do not confuse with karat below. 0496 0497 UNIT_CACHE(micron, micro()*meter()) 0498 UNIT_CACHE(angstrom, HNumber("1e-10") * meter()) 0499 UNIT_CACHE(astronomical_unit, HNumber("149597870700") * meter()) // IAU 2012 Resolution B2. 0500 UNIT_CACHE(lightyear, speed_of_light() * julian_year()) 0501 UNIT_CACHE(lightminute, speed_of_light() * minute()) 0502 UNIT_CACHE(lightsecond, speed_of_light() * second()) 0503 UNIT_CACHE(parsec, HNumber(648000)/HMath::pi() * astronomical_unit()) // IAU 2015 Resolution B2. 0504 UNIT_CACHE(inch, HNumber("0.0254") * meter()) // International inch. 0505 UNIT_CACHE(foot, HNumber(12) * inch()) 0506 UNIT_CACHE(yard, HNumber(36) * inch()) 0507 UNIT_CACHE(mile, HNumber(1760) * yard()) 0508 UNIT_CACHE(rod, HNumber("5.5") * yard()) 0509 UNIT_CACHE(furlong, HNumber(40) * rod()) 0510 UNIT_CACHE(fathom, HNumber(6) * foot()) 0511 UNIT_CACHE(nautical_mile, HNumber("1852") * meter()) 0512 UNIT_CACHE(cable, HNumber("0.1") * nautical_mile()) 0513 0514 UNIT_CACHE(are, HNumber(100) * sqmeter()) 0515 UNIT_CACHE(hectare, HNumber(100) * are()) 0516 UNIT_CACHE(acre, mile()*mile() / HNumber(640)) 0517 0518 UNIT_CACHE(US_gallon, HNumber("3.785") * liter()) 0519 UNIT_CACHE(UK_gallon, HNumber("4.54609") * liter()) 0520 UNIT_CACHE(US_quart, US_gallon() / HNumber(4)) 0521 UNIT_CACHE(UK_quart, UK_gallon() / HNumber(4)) 0522 UNIT_CACHE(US_pint, US_gallon() / HNumber(8)) 0523 UNIT_CACHE(UK_pint, UK_gallon() / HNumber(8)) 0524 UNIT_CACHE(US_fluid_ounce, US_gallon() / HNumber(128)) 0525 UNIT_CACHE(UK_fluid_ounce, UK_gallon() / HNumber(160)) 0526 UNIT_CACHE(liter, milli() * cbmeter()) 0527 0528 0529 UNIT_CACHE(minute, HNumber(60) * second()) 0530 UNIT_CACHE(hour, HNumber(60) * minute()) 0531 UNIT_CACHE(day, HNumber(24) * hour()) 0532 UNIT_CACHE(week, HNumber(7) * day()) 0533 UNIT_CACHE(julian_year, HNumber("365.25") * day()) 0534 UNIT_CACHE(tropical_year, HNumber("365.24219") * day()) // Approx.: changes over time due to Earth's precession. 0535 UNIT_CACHE(sidereal_year, HNumber("365.25636") * day()) // http://hpiers.obspm.fr/eop-pc/models/constants.html 0536 0537 UNIT_CACHE(percent, HNumber("0.01")) 0538 UNIT_CACHE(ppm, HNumber("1e-6")) 0539 UNIT_CACHE(ppb, HNumber("1e-9")) 0540 UNIT_CACHE(karat, Rational(1,24).toHNumber()) // Do not confuse with carat above. 0541 0542 UNIT_CACHE(bar, HNumber("1e5") * pascal()) 0543 UNIT_CACHE(atmosphere, HNumber("1.01325") * bar()) 0544 UNIT_CACHE(torr, atmosphere() / HNumber(760)) 0545 UNIT_CACHE(pounds_per_sqinch, pound() * gravity() / (inch()*inch())) 0546 0547 UNIT_CACHE(electron_volt, elementary_charge() * volt()) 0548 UNIT_CACHE(calorie, HNumber("4.1868") * joule()) // International Table calorie. 0549 UNIT_CACHE(british_thermal_unit, HNumber("1055.056") * joule()) // International standard ISO 31-4. 0550 0551 UNIT_CACHE(nat, bit() / HMath::ln(2)) 0552 UNIT_CACHE(hartley, HMath::ln(10) * nat()) 0553 UNIT_CACHE(byte, HNumber(8) * bit()) 0554 0555 UNIT_CACHE(exbibyte, exbi() * byte()) 0556 UNIT_CACHE(tebibyte, tebi() * byte()) 0557 UNIT_CACHE(gibibyte, gibi() * byte()) 0558 UNIT_CACHE(mebibyte, mebi() * byte()) 0559 UNIT_CACHE(kibibyte, kibi() * byte()) 0560 0561 UNIT_CACHE(bps, bit() / second()) 0562 UNIT_CACHE(tbps, tebi() * bps()) 0563 UNIT_CACHE(gbps, gibi() * bps()) 0564 UNIT_CACHE(mbps, mebi() * bps()) 0565 UNIT_CACHE(kbps, kibi() * bps()) 0566 0567 UNIT_CACHE(exabyte, exa() * HNumber(8) * bit()) 0568 UNIT_CACHE(terabyte, tera() * HNumber(8) * bit()) 0569 UNIT_CACHE(gigabyte, giga() * HNumber(8) * bit()) 0570 UNIT_CACHE(megabyte, mega() * HNumber(8) * bit()) 0571 UNIT_CACHE(kilobyte, kilo() * HNumber(8) * bit()) 0572 0573 UNIT_CACHE(tablespoon, HNumber(15) * milli()*liter()) 0574 UNIT_CACHE(teaspoon, HNumber(5) * milli()*liter()) 0575 UNIT_CACHE(cup, HNumber(240) * milli()*liter()) 0576 0577 UNIT_CACHE(gravity, HNumber("9.80665") * newton() / kilogram()) // 3rd CGPM (1901, CR 70). 0578 UNIT_CACHE(speed_of_light, HNumber(299792458) * meter() / second()) 0579 UNIT_CACHE(elementary_charge, HNumber("1.6021766208e-19") * coulomb()) // http://physics.nist.gov/cgi-bin/cuu/Value?e 0580 UNIT_CACHE(speed_of_sound_STP, HNumber(331) * meter()/second()) 0581 UNIT_CACHE(knot, nautical_mile()/hour()) 0582 UNIT_CACHE(horsepower, HNumber(550) * foot() * pound() * gravity() / second()) // Imperial horsepower.