swift - 类协议(protocol) : Cannot use mutating member on immutable value: 'self' is immutable

Question

我有来自框架的协议(protocol)

public protocol BaseMappable {
    /// This function is where all variable mappings should occur. It is executed by Mapper during the mapping (serialization and deserialization) process.
    mutating func mapping(map: Map)
}

我有我的扩展协议(protocol)(默认实现)

public protocol DtoResponseRequestActionable: class {
    func transferToResponceAction(_ dto: TransferToResponce)
}

extension DtoResponseRequestActionable where Self: BaseMappable {

    func transferToResponceAction(_ dto: TransferToResponce) {
        var map = Map(mappingType: .toJSON, JSON: [:])
        dto.transfering(map: map)
        let json = map.JSON
        map = Map(mappingType: .fromJSON, JSON: json)
        mapping(map: map) // <<< ERROR
    }

}

但是我有错误

Cannot use mutating member on immutable value: 'self' is immutable

对于默认 imp，我该如何修复它。如果我将代码从扩展复制/粘贴到每个类，效果很好，但我需要默认 imp。任何解决方案？

Answer 1

这可能有帮助

public protocol BaseMappable : class {
    /// This function is where all variable mappings should occur. It is executed by Mapper during the mapping (serialization and deserialization) process.
   func mapping(map: Map)
}

另一种方法是从

中删除类

public protocol DtoResponseRequestActionable {
    mutating func transferToResponceAction(_ dto: TransferToResponce)
}

并将变异添加到

mutating func transferToResponceAction(_ dto: TransferToResponce) {