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102
core/src/main/scala/coulomb/conversion/coefficient.scala
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| /* | ||
| * Copyright 2022 Erik Erlandson | ||
| * | ||
| * Licensed under the Apache License, Version 2.0 (the "License"); | ||
| * you may not use this file except in compliance with the License. | ||
| * You may obtain a copy of the License at | ||
| * | ||
| * http://www.apache.org/licenses/LICENSE-2.0 | ||
| * | ||
| * Unless required by applicable law or agreed to in writing, software | ||
| * distributed under the License is distributed on an "AS IS" BASIS, | ||
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| * See the License for the specific language governing permissions and | ||
| * limitations under the License. | ||
| */ | ||
|
|
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| package coulomb.conversion | ||
|
|
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| import scala.annotation.implicitNotFound | ||
|
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| /** | ||
| * A typeclass representing a unit conversion coefficient. | ||
| * @tparam V | ||
| * the value type the unit conversion is operating on | ||
| * @tparam UF | ||
| * the unit being converted from | ||
| * @tparam UT | ||
| * the unit being converted to | ||
| * @param value | ||
| * the value of the conversion coefficient | ||
| */ | ||
| @implicitNotFound( | ||
| "No coefficient could be derived for value type ${V}, unit types ${UF} => ${UT}" | ||
| ) | ||
| class Coefficient[V, UF, UT](val value: V) | ||
|
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| /** unit conversion companion methods and definitions */ | ||
| object Coefficient: | ||
| import scala.compiletime.* | ||
| import algebra.ring.* | ||
| import spire.math.* | ||
| import coulomb.infra.typeexpr | ||
| import coulomb.conversion.coefficients.* | ||
|
|
||
| /** | ||
| * Obtain the coefficient of conversion from one unit expression to another | ||
| * @tparam UF | ||
| * the input unit expression | ||
| * @tparam UT | ||
| * the output unit expression | ||
| * @tparam V | ||
| * the value type to return | ||
| * @return | ||
| * The coefficient of conversion from UF to UT. | ||
| * @note | ||
| * If UF and UT are not convertible, or if a coefficient | ||
| * cannot be constructed for value type `V`, then a | ||
| * compilation failure will result. | ||
| */ | ||
| inline def apply[V, UF, UT]: V = | ||
| inline erasedValue[V] match | ||
| case _: Float => coefficientFloat[UF, UT].asInstanceOf[V] | ||
| case _: Double => coefficientDouble[UF, UT].asInstanceOf[V] | ||
| case _: BigDecimal => coefficientBigDecimal[UF, UT].asInstanceOf[V] | ||
| case _: Rational => coefficientRational[UF, UT].asInstanceOf[V] | ||
| case _: java.lang.Float => | ||
| coefficientFloatJ[UF, UT].asInstanceOf[V] | ||
| case _: java.lang.Double => | ||
| coefficientDoubleJ[UF, UT].asInstanceOf[V] | ||
| case _ => | ||
| summonInline[Coefficient[V, UF, UT]].value | ||
|
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| inline given g_Coefficient[V, UF, UT]: Coefficient[V, UF, UT] = | ||
| inline erasedValue[V] match | ||
| case _: Float => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientFloat[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _: Double => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientDouble[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _: BigDecimal => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientBigDecimal[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _: Rational => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientRational[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _: java.lang.Float => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientFloatJ[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _: java.lang.Double => | ||
| new Coefficient[V, UF, UT]( | ||
| coefficientDoubleJ[UF, UT].asInstanceOf[V] | ||
| ) | ||
| case _ => | ||
| val (_, vc) = | ||
| summonAll[(Fractional[V], ValueConversion[Rational, V])] | ||
| new Coefficient[V, UF, UT](vc(coefficientRational[UF, UT])) |
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