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13.36.cpp
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13.36.cpp
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#include <string>
#include <set>
/** Message.h **/
class Message {
friend class Folder;
friend void swap(Message &, Message &);
friend void swap(Folder &, Folder &);
public:
explicit Message(const std::string &s = "") : contents(s), folders() {}
Message(const Message &);
Message &operator=(const Message &);
~Message();
void save(Folder &);
void remove(Folder &);
private:
std::string contents;
std::set<Folder *> folders;
void add_to_folders(const Message &);
void remove_from_folders();
};
void swap(Message &, Message &);
/** Folder.h **/
class Folder {
friend class Message;
friend void swap(Message &, Message &);
friend void swap(Folder &, Folder &);
public:
Folder() = default;
Folder(const Folder &);
Folder &operator=(const Folder &);
~Folder();
void save(Message &);
void remove(Message &);
private:
std::set<Message *> messages;
void addMsg(Message *);
void remMsg(Message *);
};
void swap(Folder &, Folder &);
/** Message.cpp **/
void swap(Message &lhs, Message &rhs) {
using std::swap;
for (auto &fp : lhs.folders)
fp->remMsg(&lhs);
for (auto &fp : rhs.folders)
fp->remMsg(&rhs);
swap(lhs.contents, rhs.contents);
swap(lhs.folders, rhs.folders);
for (auto &fp : lhs.folders)
fp->addMsg(&lhs);
for (auto &fp : rhs.folders)
fp->addMsg(&rhs);
}
void Message::save(Folder &f) {
folders.insert(&f);
f.addMsg(this);
}
void Message::remove(Folder &f) {
folders.erase(&f);
f.remMsg(this);
}
void Message::add_to_folders(const Message &m) {
// TODO could this function be without parameter?
for (auto &fp : m.folders)
fp->addMsg(this);
}
void Message::remove_from_folders() {
for (auto &fp : folders)
fp->remMsg(this);
folders.clear();
}
Message::Message(const Message &m) : contents(m.contents), folders(m.folders) {
add_to_folders(m);
}
Message &Message::operator=(const Message &rhs) {
remove_from_folders();
contents = rhs.contents;
folders = rhs.folders;
add_to_folders(rhs);
return *this;
}
Message::~Message() {
remove_from_folders();
}
/** Folder.cpp **/
void swap(Folder &lhs, Folder &rhs){
using std::swap;
for (auto &mp : lhs.messages)
mp->folders.erase(&lhs);
for (auto &mp : rhs.messages)
mp->folders.erase(&rhs);
swap(lhs.messages, rhs.messages);
for (auto &mp : lhs.messages)
mp->folders.insert(&lhs);
for (auto &mp : rhs.messages)
mp->folders.insert(&rhs);
}
void Folder::addMsg(Message *mp) {
messages.insert(mp);
}
void Folder::remMsg(Message *mp) {
messages.erase(mp);
}
void Folder::save(Message &m) {
messages.insert(&m);
m.folders.insert(this);
}
void Folder::remove(Message &m) {
messages.erase(&m);
m.folders.erase(this);
}
Folder::Folder(const Folder &f) : messages(f.messages) {
for (auto &mp : messages)
mp->folders.insert(this);
}
Folder &Folder::operator=(const Folder &rhs) {
for (auto &mp : messages)
mp->folders.erase(this);
messages = rhs.messages;
for (auto &mp : messages)
mp->folders.insert(this);
return *this;
}
Folder::~Folder() {
for (auto &mp : messages)
mp->folders.erase(this);
}
/** Test.cpp **/
int main() {
Folder f1, f2;
Message m1("Hello"), m2("World"), m3("Happy"), m4("New Year"), m5(":-)");
f1.save(m1);
f1.save(m2);
f1.save(m5);
f2.save(m3);
f2.save(m4);
f2.save(m5);
return 0;
}