// 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 io import ( "github.com/IBM/fp-go/v2/function" ) // WithResource constructs a function that creates a resource, operates on it, and then releases it. // This is a higher-level abstraction over Bracket that simplifies resource management patterns. // // The resource is guaranteed to be released even if the operation fails or panics. // // Example: // // withFile := io.WithResource( // io.Of(openFile("data.txt")), // func(f *os.File) io.IO[any] { // return io.FromImpure(func() { f.Close() }) // }, // ) // result := withFile(func(f *os.File) io.IO[Data] { // return readData(f) // }) func WithResource[ R, A, ANY any](onCreate IO[R], onRelease func(R) IO[ANY]) Kleisli[Kleisli[R, A], A] { // simply map to implementation of bracket return function.Bind13of3(Bracket[R, A, ANY])(onCreate, function.Ignore2of2[A](onRelease)) }