// Copyright (c) 2023 - 2025 IBM Corp. // All rights reserved. // // 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 result import ( "github.com/IBM/fp-go/v2/either" ) // WithResource constructs a function that creates a resource, operates on it, and then releases it. // This ensures proper resource cleanup even if operations fail. // The resource is released immediately after the operation completes. // // Parameters: // - onCreate: Function to create/acquire the resource // - onRelease: Function to release/cleanup the resource // // Returns a function that takes an operation to perform on the resource. // // Example: // // withFile := either.WithResource( // func() either.Result[*os.File] { // return either.TryCatchError(os.Open("file.txt")) // }, // func(f *os.File) either.Result[any] { // return either.TryCatchError(f.Close()) // }, // ) // result := withFile(func(f *os.File) either.Result[string] { // // Use file here // return either.Right[error]("data") // }) func WithResource[R, A, ANY any](onCreate func() Result[R], onRelease Kleisli[R, ANY]) Kleisli[Kleisli[R, A], A] { return either.WithResource[error, R, A, ANY](onCreate, onRelease) }