element-ios/RiotSwiftUI/Modules/Common/Util/SafeBindingCollectionEnumerator.swift

// 
// Copyright 2021 New Vector Ltd
//
// 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.
//

import SwiftUI

/**
 Used to avoid crashes when enumerating through bindings in the AnswerOptions ForEach
 https://stackoverflow.com/q/65375372
 Replace with Swift 5.5 bindings enumerator later.
 */
struct SafeBindingCollectionEnumerator<T: RandomAccessCollection & MutableCollection, C: View>: View {
    
    typealias BoundElement = Binding<T.Element>
    private let binding: BoundElement
    private let content: (BoundElement) -> C
    
    init(_ binding: Binding<T>, index: T.Index, @ViewBuilder content: @escaping (BoundElement) -> C) {
        self.content = content
        self.binding = .init(get: { binding.wrappedValue[index] },
                             set: { binding.wrappedValue[index] = $0 })
    }
    
    var body: some View {
        content(binding)
    }
}