fp-go/v2/io/resource.go

// 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]) func(func(R) IO[A]) IO[A] {
	// simply map to implementation of bracket
	return function.Bind13of3(Bracket[R, A, ANY])(onCreate, function.Ignore2of2[A](onRelease))
}