| /* |
| * Licensed to the Apache Software Foundation (ASF) under one or more |
| * contributor license agreements. See the NOTICE file distributed with |
| * this work for additional information regarding copyright ownership. |
| * The ASF licenses this file to You 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 org.apache.daffodil.debugger.dap |
| |
| import cats.effect._ |
| |
| /** Produce the next value in a series, like for data identifiers. */ |
| trait Next[A] { |
| def next(): IO[A] |
| |
| def map[B](f: A => B): Next[B] = |
| () => next().map(f) |
| } |
| |
| object Next { |
| // TODO: optional starting value |
| def int: IO[Next[Int]] = |
| for { |
| ids <- Ref[IO].of(0) |
| } yield new Next[Int] { |
| def next: IO[Int] = ids.getAndUpdate(_ + 1) |
| } |
| } |
