zio.test.poly.GenNumericPoly.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}
/**
* `GenNumericPoly` provides evidence that instances of `Gen[T]` and
* `Numeric[T]` exist for some concrete but unknown type `T`.
*/
trait GenNumericPoly extends GenOrderingPoly {
val numT: Numeric[T]
override final val ordT: Ordering[T] = numT
}
object GenNumericPoly {
/**
* Constructs an instance of `GenIntegralPoly` using the specified `Gen` and
* `Numeric` instances, existentially hiding the underlying type.
*/
def apply[A](gen: Gen[Random with Sized, A], num: Numeric[A]): GenNumericPoly =
new GenNumericPoly {
type T = A
val genT = gen
val numT = num
}
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for bytes.
*/
val byte: GenNumericPoly =
GenIntegralPoly.byte
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for
* characters.
*/
val char: GenNumericPoly =
GenIntegralPoly.char
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for doubles.
*/
val double: GenNumericPoly =
GenFractionalPoly.double
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for floats.
*/
val float: GenNumericPoly =
GenFractionalPoly.float
/**
* A generator of polymorphic values constrainted to have a `Numeric`
* instance.
*/
lazy val genNumericPoly: Gen[Random, GenNumericPoly] =
Gen.elements(
byte,
char,
double,
float,
int,
long,
short
)
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for integers.
*/
val int: GenNumericPoly =
GenIntegralPoly.int
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for longs.
*/
val long: GenNumericPoly =
GenIntegralPoly.long
/**
* Provides evidence that instances of `Gen` and `Numeric` exist for shorts.
*/
val short: GenNumericPoly =
GenIntegralPoly.long
}