IntValue/IntValue.swift at main · byvf/IntValue · GitHub

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//
//  IntValue.swift
//  ListBook
//
//  Created by Vladylav Filippov on 29.06.2021.
//

import Foundation

@propertyWrapper struct IntValue {

    private var _wrappedValue: Int = 0

    var wrappedValue: Int {
        get {
            return _wrappedValue
        } set {
            _wrappedValue = newValue
        }
    }

    init(wrappedValue: Int = 0) {
        self.wrappedValue = wrappedValue
    }

    init() {
        self.wrappedValue = 0
    }
}

extension IntValue: Codable {

    init(from decoder: Decoder) throws {
        let container = try decoder.singleValueContainer()
        if container.decodeNil() {
            _wrappedValue = 0
        } else {
            _wrappedValue = try container.decode(Int.self)
        }
    }

    func encode(to encoder: Encoder) throws {
        var container = encoder.singleValueContainer()
        try container.encode(_wrappedValue)
    }
}