├── project ├── build.properties └── plugins.sbt ├── src └── main │ └── scala │ └── implicitlogic │ ├── package.scala │ ├── typehelpers.scala │ ├── Not.scala │ ├── And.scala │ ├── Xor.scala │ ├── Optional.scala │ └── Or.scala ├── README.md └── LICENSE /project/build.properties: -------------------------------------------------------------------------------- 1 | sbt.version=0.13.13 2 | -------------------------------------------------------------------------------- /project/plugins.sbt: -------------------------------------------------------------------------------- 1 | addSbtPlugin("de.heikoseeberger" % "sbt-header" % "1.5.0") 2 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/package.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package object implicitlogic { 18 | type &&[A,B] = A And B 19 | type ||[A,B] = A Or B 20 | type ![A] = Not[A] 21 | } 22 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/typehelpers.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | object typehelpers { 20 | type Union[X,A,B] = (X <:< A) Or (X <:< B) 21 | type U[A,B] = { type lambda[X] = Union[X,A,B] } 22 | type <:!<[A,B] = Not[A <:< B] 23 | type NotSubtypeOf[A] = { type lambda[X] = X <:!< A } 24 | type NotSupertypeOf[A] = { type lambda[X] = A <:!< X } 25 | type =:!=[A,B] = Not[A =:= B] 26 | type NotType[A] = { type lambda[X] = X =:!= A } 27 | } 28 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/Not.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | //import scala.annotation.compileTimeOnly 20 | 21 | sealed trait Not[A] { 22 | override def toString: String = "Not" 23 | } 24 | 25 | object Not { 26 | private val notInstance = new Not[Any] { } 27 | 28 | implicit def makeNot[A]: Not[A] = notInstance.asInstanceOf[Not[A]] 29 | //@compileTimeOnly("The method `makeNotAmbig` should never be called.") 30 | implicit def makeNotAmbig[A](implicit a: A): Not[A] = sys.error("this method should never be called") 31 | } 32 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/And.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | sealed trait And[A,B] { 20 | def result: (A,B) 21 | 22 | override def toString = s"And($result)" 23 | override def equals(that: Any) = that match { 24 | case and: And[_,_] => result.equals(and.result) 25 | case _ => false 26 | } 27 | override def hashCode = 13 * 7 + result.hashCode 28 | } 29 | 30 | object And { 31 | private def apply[A,B](ab: (A,B)) = new And[A,B] { 32 | val result = ab 33 | } 34 | 35 | implicit def makeAnd[A,B](implicit a: A, b: B): And[A,B] = And((a,b)) 36 | } 37 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/Xor.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | sealed trait Xor[A,B] { 20 | def result: Either[A,B] 21 | 22 | override def toString = s"Xor($result)" 23 | override def equals(that: Any) = that match { 24 | case xor: Xor[_,_] => result.equals(xor.result) 25 | case _ => false 26 | } 27 | override def hashCode = 13 * 7 + result.hashCode 28 | } 29 | 30 | object Xor { 31 | private def apply[A,B](ab: Either[A,B]) = new Xor[A,B] { 32 | val result = ab 33 | } 34 | 35 | implicit def makeXor[A,B](implicit ev : (A || B) && ![A && B]): Xor[A,B] = { 36 | val (or, _) = ev.result 37 | Xor(or.result) 38 | } 39 | } 40 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/Optional.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | sealed trait Optional[A] { 20 | def result: Option[A] 21 | 22 | override def toString = s"Optional($result)" 23 | override def equals(that: Any) = that match { 24 | case opt: Optional[_] => result.equals(opt.result) 25 | case _ => false 26 | } 27 | override def hashCode = 13 * 19 + result.hashCode 28 | } 29 | 30 | object Optional { 31 | private def apply[A](ab: Option[A]) = new Optional[A] { 32 | val result = ab 33 | } 34 | 35 | implicit def makeOptional[A](implicit ev : (![A] || A)): Optional[A] = { 36 | val result = ev.result match { 37 | case Left(_) => None 38 | case Right(a) => Some(a) 39 | } 40 | Optional(result) 41 | } 42 | } 43 | -------------------------------------------------------------------------------- /src/main/scala/implicitlogic/Or.scala: -------------------------------------------------------------------------------- 1 | /* 2 | * Copyright 2016 Jasper Moeys 3 | * 4 | * Licensed under the Apache License, Version 2.0 (the "License"); 5 | * you may not use this file except in compliance with the License. 6 | * You may obtain a copy of the License at 7 | * 8 | * http://www.apache.org/licenses/LICENSE-2.0 9 | * 10 | * Unless required by applicable law or agreed to in writing, software 11 | * distributed under the License is distributed on an "AS IS" BASIS, 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | * See the License for the specific language governing permissions and 14 | * limitations under the License. 15 | */ 16 | 17 | package implicitlogic 18 | 19 | /* 20 | * Equivalent but without "result" value: type Or[A,B] = Not[Not[A] And Not[B]] 21 | */ 22 | sealed trait Or[A,B] { 23 | def result: Either[A,B] 24 | 25 | override def toString = s"Or($result)" 26 | override def equals(that: Any) = that match { 27 | case or: Or[_,_] => result.equals(or.result) 28 | case _ => false 29 | } 30 | override def hashCode = 13 * 17 + result.hashCode 31 | } 32 | 33 | protected sealed trait LowerPriorityOr { this: OrFactory => 34 | implicit def makeOrRight[A,B](implicit b: B): Or[A,B] = createOr(Right(b)) 35 | } 36 | 37 | protected sealed trait OrFactory { 38 | protected[this] def createOr[A,B](ab: Either[A,B]) = new Or[A,B] { 39 | val result = ab 40 | } 41 | } 42 | 43 | object Or extends LowerPriorityOr with OrFactory { 44 | 45 | implicit def makeOrLeft[A,B](implicit a: A): Or[A, B] = createOr(Left(a)) 46 | } 47 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # implicitlogic 2 | 3 | This is a simple toy project for playing around with some implicit resolution tricks. 4 | 5 | 6 | ### Examples 7 | 8 | ```scala 9 | scala> import implicitlogic._ 10 | import implicitlogic._ 11 | 12 | scala> def stringIntSymbol[A](a: A)(implicit ev: (A <:< String) Or (A <:< Int) Or (A <:< Symbol)): A = a 13 | stringIntSymbol: [A](a: A)(implicit ev: implicitlogic.Or[implicitlogic.Or[<:<[A,String],<:<[A,Int]],<:<[A,Symbol]])A 14 | 15 | scala> stringIntSymbol(42) 16 | res8: Int = 42 17 | 18 | scala> stringIntSymbol("foo") 19 | res9: String = foo 20 | 21 | scala> stringIntSymbol('bar) 22 | res10: Symbol = 'bar 23 | 24 | scala> stringIntSymbol(42.5) 25 | :16: error: could not find implicit value for parameter ev: implicitlogic.Or[implicitlogic.Or[<:<[Double,String],<:<[Double,Int]],<:<[Double,Symbol]] 26 | stringIntSymbol(42.5) 27 | ^ 28 | 29 | scala> def noAnyTypes[A](x: A, y: A)(implicit ev: Not[(AnyVal <:< A) Or (AnyRef <:< A)]) = List(x,y) 30 | noAnyTypes: [A](x: A, y: A)(implicit ev: implicitlogic.Not[implicitlogic.Or[<:<[AnyVal,A],<:<[AnyRef,A]]])List[A] 31 | 32 | scala> noAnyTypes(3, "foo") 33 | :16: error: ambiguous implicit values: 34 | both method makeNot in object Not of type [A]=> implicitlogic.Not[A] 35 | and method makeNotAmbig in object Not of type [A](implicit a: A)implicitlogic.Not[A] 36 | match expected type implicitlogic.Not[implicitlogic.Or[<:<[AnyVal,Any],<:<[AnyRef,Any]]] 37 | noAnyTypes(3, "foo") 38 | ^ 39 | 40 | scala> noAnyTypes(BigInt(4), 7) 41 | :16: error: ambiguous implicit values: 42 | both method makeNot in object Not of type [A]=> implicitlogic.Not[A] 43 | and method makeNotAmbig in object Not of type [A](implicit a: A)implicitlogic.Not[A] 44 | match expected type implicitlogic.Not[implicitlogic.Or[<:<[AnyVal,Any],<:<[AnyRef,Any]]] 45 | noAnyTypes(BigInt(4), 7) 46 | ^ 47 | 48 | scala> noAnyTypes(Some(5), None) 49 | res23: List[Option[Int]] = List(Some(5), None) 50 | 51 | scala> def noIntegralFractions[A](a: A)(implicit ev: Not[Integral[A] And Fractional[A]]): A = a 52 | noIntegralFractions: [A](a: A)(implicit ev: implicitlogic.Not[implicitlogic.And[Integral[A],Fractional[A]]])A 53 | ``` 54 | 55 | The underlying values of `And` and `Or` can be accessed through their `result` attribute. `Not` obviously has no result. You can also use the aliases `&&`, `||` and `!`. 56 | 57 | ```scala 58 | scala> val (numeric, ordering) = implicitly[Numeric[Int] && Ordering[Int]].result 59 | numeric: Numeric[Int] = scala.math.Numeric$IntIsIntegral$@21d0366 60 | ordering: Ordering[Int] = scala.math.Ordering$Int$@11507b97 61 | 62 | scala> val Left(numeric) = implicitly[Numeric[Int] || Ordering[Int]].result 63 | numeric: Numeric[Int] = scala.math.Numeric$IntIsIntegral$@21d0366 64 | ``` 65 | 66 | `Xor` is [defined](https://github.com/Jasper-M/implicitlogic/blob/master/src/main/scala/implicitlogic/Xor.scala#L35) in function of `And`, `Or` and `Not`. 67 | 68 | ```scala 69 | scala> implicitly[Numeric[Int] Xor Ordering[Int]] 70 | :15: error: could not find implicit value for parameter e: implicitlogic.Xor[Numeric[Int],Ordering[Int]] 71 | implicitly[Numeric[Int] Xor Ordering[Int]] 72 | ^ 73 | 74 | scala> trait Foo[T] 75 | defined trait Foo 76 | 77 | scala> implicitly[Numeric[Int] Xor Foo[Int]] 78 | res2: implicitlogic.Xor[Numeric[Int],Foo[Int]] = Xor(Left(scala.math.Numeric$IntIsIntegral$@60a53041)) 79 | 80 | scala> implicitly[Foo[Int] Xor Ordering[Int]] 81 | res3: implicitlogic.Xor[Foo[Int],Ordering[Int]] = Xor(Right(scala.math.Ordering$Int$@69c31872)) 82 | ``` 83 | 84 | There are also some helpful type aliases in [the `typehelpers` object](https://github.com/Jasper-M/implicitlogic/blob/master/src/main/scala/implicitlogic/typehelpers.scala). 85 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | Apache License 2 | Version 2.0, January 2004 3 | http://www.apache.org/licenses/ 4 | 5 | TERMS AND CONDITIONS FOR USE, REPRODUCTION, AND DISTRIBUTION 6 | 7 | 1. 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