zio.test.poly.GenIntegralPoly.scala Maven / Gradle / Ivy
/*
* Copyright 2020-2021 John A. De Goes and the ZIO Contributors
*
* 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.
*/
package zio.test.poly
import zio.random.Random
import zio.test.{Gen, Sized}
/**
* `GenIntegralPoly` provides evidence that instances of `Gen[T]` and
* `Integral[T]` exist for some concrete but unknown type `T`.
*/
trait GenIntegralPoly extends GenNumericPoly {
override val numT: Integral[T]
}
object GenIntegralPoly {
/**
* Constructs an instance of `GenIntegralPoly` using the specified `Gen` and
* `Integral` instances, existentially hiding the underlying type.
*/
def apply[A](gen: Gen[Random with Sized, A], num: Integral[A]): GenIntegralPoly =
new GenIntegralPoly {
type T = A
val genT = gen
val numT = num
}
/**
* Provides evidence that instances of `Gen` and `Integral` exist for bytes.
*/
val byte: GenIntegralPoly =
GenIntegralPoly(Gen.anyByte, Numeric.ByteIsIntegral)
/**
* Provides evidence that instances of `Gen` and `Integral` exist for
* characters.
*/
val char: GenIntegralPoly =
GenIntegralPoly(Gen.anyChar, Numeric.CharIsIntegral)
/**
* A generator of polymorphic values constrainted to have an `Integral`
* instance.
*/
lazy val genIntegralPoly: Gen[Random, GenIntegralPoly] =
Gen.elements(byte, char, int, long, short)
/**
* Provides evidence that instances of `Gen` and `Integral` exist for
* integers.
*/
val int: GenIntegralPoly =
GenIntegralPoly(Gen.anyInt, Numeric.IntIsIntegral)
/**
* Provides evidence that instances of `Gen` and `Integral` exist for longs.
*/
val long: GenIntegralPoly =
GenIntegralPoly(Gen.anyLong, Numeric.LongIsIntegral)
/**
* Provides evidence that instances of `Gen` and `Integral` exist for shorts.
*/
val short: GenIntegralPoly =
GenIntegralPoly(Gen.anyShort, Numeric.ShortIsIntegral)
}