Generic class inheritance

.swift

import Foundation

protocol Network {
    typealias SuccessHandler = (Array<Response>) -> Void
    associatedtype Response: Codable
    var payloads: Array<Response> { get }
    func fire(onSuccess: SuccessHandler)
}

extension NetworkParent where Response == Int {
    func fire(onSuccess: SuccessHandler) {
        // Special Response type case
    }
}

class NetworkParent<Response: Codable> {
    var payloads: Array<Response> = []
    init(type: Response.Type) { }
    func fire(onSuccess: SuccessHandler) {
        // General case
    }
}

extension NetworkChild where Response == String {
    func fire(onSuccess: SuccessHandler) {
         // Special Response type case on Child class
    }
}

final class NetworkChild<Response: Codable>: NetworkParent<Response> { }

struct Payload: Codable { let head: String, body: String }

let networkChild = NetworkChild(type: Payload.self)
print(type(of: networkChild.payloads))




import Foundation

protocol Network {
    typealias SuccessHandler = (Array<Response>) -> Void
    associatedtype Response: Codable, PayloadProtocol
    var payloads: Array<Response> { get }
    func fire(onSuccess: SuccessHandler)
}

extension NetworkParent where Response.Body == Int {
    func fire(onSuccess: SuccessHandler) {
        // Special Response type case
    }
}

class NetworkParent<Response: Codable & PayloadProtocol>: Network {
    var payloads: Array<Response> = []
    init(type: Response.Type) { }
    func fire(onSuccess: SuccessHandler) {
        // General case
    }
}

extension NetworkChild where Response.Body == String {

//    func fire(onSuccess: SuccessHandler) {
//         // Special Response type case on Child class
//    }
}

final class NetworkChild<Response: Codable & PayloadProtocol>: NetworkParent<Response> { }

protocol PayloadProtocol {
    associatedtype Body: Codable
    var body: Body { get }
}

struct Payload<Body: Codable>: Codable, PayloadProtocol {
    let head: String, body: Body }

let networkChild = NetworkChild(type: Payload<Int>.self)
print(type(of: networkChild.payloads))