protected

问题 This might be a dumb question, but I don't get it: I have a class called Card. I want to do a shallow clone using MemberWiseClone(). In Theory Card inherits from Object. So it should be able to use MemberWiseClone(), even if MWC() is protected ?? Am I missing/forgetting something? 回答1: Card can use it. class Card { public Card Clone() { return (Card)MemberwiseClone(); } } 回答2: You can only call a protected method on an object of the (compile-time) type of the class that your code is in.

问题 I am trying to avoid multiple instances of a class being created with the same internal data. I tried an implementation with a separate class for building the MCode but trying to protect the MCode constructor did not work so I have come back to this implementation. I wonder if this is good design or what better solution there may be? public class MCode : IEquatable<MCode> { private readonly static List<MCode> Instances; public AEnum AE { get; } public byte C { get; } public BEnum BE { get; }

问题 The 2011 C++ Standard states in section 11.4 that An additional access check beyond those described earlier in Clause 11 is applied when a non-static data member or non-static member function is a protected member of its naming class ( 11.2 ) 115 As described earlier, access to a protected member is granted because the reference occurs in a friend or member of some class C . If the access is to form a pointer to member ( 5.3.1 ), the nested-name-specifier shall denote C or a class derived

问题 I have abstract class A, from which I inherit a number of classes. In the derived classes I am trying to access protected function in A trough A pointer. But I get a compiler error. class A { protected: virtual void f()=0; }; class D : public A { public: D(A* aa) :mAPtr(aa){} void g(); protected: virtual void f(); private: A* mAPtr; // ptr shows to some derived class instance }; void D::f(){ } void D::g() { mAPtr->f(); } The compiler error says : cannot access protected member A::f declared

问题 World.cpp: World::World() { //something } World::~World() { //something } void World::doSomething(Organism *organisms[20][20]) { cout << organisms[1][1]->Key(); // example of what I need to do here } int main() { World *world = new World(); World::doSomething(world->organisms); return 0; } world.h class World { public: static void doSomething(Organism *organisms[20][20]); World(); ~World(); Organism *organisms[20][20]; }; Organism.cpp Organism::Organism(){ } Organism::~Organism(){ } char

问题 Hi I have an abstract class in which I have some public methods and some abstract ones. I have the public so that they implement the common methods for the derived classes. What is confusing me is why I will want to define a public abstract method instead of protected abstract. That makes no sense to me to define a public abstract method in abstract class.... because if is an abstract will be overridden, in the derived classes, but the same is if is defined as public but somehow it makes more

问题 I'm trying to write an abstract class (or interface) which forces the extending class to implement a protected static function. But this is neither possible with an abstract class nor an interface. Errors: static functions should not be abstract access type for interface members must be omitted Any ideas how to accomplish that? UPDATE The purpose is basically to call the public function statically. This way the class does not need to be instanciated. It is also not necessary to make

问题 I have documents in Solr/Lucene (3.x) with a special copy field facet_headline in order to have an unstemmed field for faceting. Sometimes 2 ore more words are belong together, and this should be handled/counted as one word, for example "kim jong il". So the headline "Saturday: kim jong il had died" should be split into: Saturday kim jong il had died For this reason I decided to use protected words (protwords), where I add kim jong il . The schema.xml looks like this. <fieldType name="facet

问题 I have a parent object that I use for general CRUD in my applications - it has basic save & retrieve methods so I can don't have to reinclude them them in all my objects. Most of my child objects extend this base object. This has worked fine, but I'm finding a problem with retrieving a serialized child object. I use a "retrieve" method in the parent object that creates an instance of the child, then populates itself from the properties of the unserialized child - this means is can "self

问题 Here's my script, but I can't get it to work for some weird reason??!!! Driving me nuts. function removeThenSetProtection() { // Remove all range protections in the spreadsheet that the user has //permission to edit. var ss = SpreadsheetApp.getActive(); var protections = ss.getProtections(SpreadsheetApp.ProtectionType.SHEET); for (var i = 0; i < protections.length; i++) { var protection = protections[i]; if (protection.canEdit()) { protection.remove(); } } } 回答1: Change: var protections = ss