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SymbolInstances.scala
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SymbolInstances.scala
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/*
* Copyright (c) 2015 Typelevel
*
* Permission is hereby granted, free of charge, to any person obtaining a copy of
* this software and associated documentation files (the "Software"), to deal in
* the Software without restriction, including without limitation the rights to
* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of
* the Software, and to permit persons to whom the Software is furnished to do so,
* subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
* FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
* COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
* IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
*/
package cats.kernel
package instances
trait SymbolInstances {
implicit val catsKernelStdOrderForSymbol: Order[Symbol] with Hash[Symbol] with LowerBounded[Symbol] = new SymbolOrder
}
trait SymbolLowerBounded extends LowerBounded[Symbol] {
override def minBound: Symbol = Symbol("")
}
class SymbolOrder extends Order[Symbol] with Hash[Symbol] with SymbolLowerBounded { self =>
def hash(x: Symbol): Int = x.hashCode()
override def eqv(x: Symbol, y: Symbol): Boolean =
// Symbols are interned
x eq y
def compare(x: Symbol, y: Symbol): Int =
if (x eq y) 0 else x.name.compareTo(y.name)
override val partialOrder: PartialOrder[Symbol] = self
}