This page is a snapshot from the LWG issues list, see the Library Active Issues List for more information and the meaning of NAD Editorial status.

1232. Still swap's with rvalue-references

Section: 16 [library] Status: NAD Editorial Submitter: Daniel Krügler Opened: 2009-10-11 Last modified: 2016-01-28

Priority: Not Prioritized

View other active issues in [library].

View all other issues in [library].

View all issues with NAD Editorial status.

Discussion:

The current library contains still rvalue reference-swaps that seem to be overlooked in the process of switching back to lvalue-ref swaps.

[ 2009-10 Santa Cruz: ]

Editor accepts as NAD Editorial.

Proposed resolution:

  1. Change 22.3 [pairs]/1 as indicated: 

    template <class T1, class T2>
struct pair {
  ...
  void swap(pair&& p);
};

  2. Change 22.3 [pairs] before p. 17 as indicated: 

    void swap(pair&& p);

  3. Change 22.3 [pairs] before p. 21 as indicated: 

    template<class T1, class T2> void swap(pair<T1, T2>& x, pair<T1, T2>& y);
template<class T1, class T2> void swap(pair<T1, T2>&& x, pair<T1, T2>& y);
template<class T1, class T2> void swap(pair<T1, T2>& x, pair<T1, T2>&& y);

  4. Change 22.4.1 [tuple.general]/2, header <tuple> synopsis, as indicated: 

    // 20.5.2.9, specialized algorithms:
template <class... Types>
void swap(tuple<Types...>& x, tuple<Types...>& y);
template <class... Types>
void swap(tuple<Types...>&& x, tuple<Types...>& y);
template <class... Types>
void swap(tuple<Types...>& x, tuple<Types...>&& y);

  5. Change 22.4.4 [tuple.tuple] as indicated: 

    // 20.5.2.3, tuple swap
void swap(tuple&&)

  6. Change 22.4.4.3 [tuple.swap] before 1 as indicated: 

    void swap(tuple&& rhs);

  7. Change 22.10 [function.objects]/2, header <functional> synopsis, as indicated: 

    template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&);
template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&&, function<R(ArgTypes...)>&);
template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)&&);

  8. Change 22.10.17.3 [func.wrap.func], as indicated: 

    // 20.7.15.2.2, function modifiers:
void swap(function&&);
template<class F, class A> void assign(F, const A&);

[..]

// 20.7.15.2.7, specialized algorithms:
template <class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&);
template <class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&&, function<R(ArgTypes...)>&);
template <class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&, function<R(ArgTypes...)>&&);

  9. Change 22.10.17.3.8 [func.wrap.func.alg] before 1 as indicated: 

    template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>& f1, function<R(ArgTypes...)>& f2);
template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>&& f1, function<R(ArgTypes...)>& f2);
template<class R, class... ArgTypes>
void swap(function<R(ArgTypes...)>& f1, function<R(ArgTypes...)>&& f2);

  10. Change 20.3.2.2 [util.smartptr.shared]/1 as indicated: 

    // 20.8.12.2.4, modifiers:
void swap(shared_ptr&& r);

[..]

// 20.8.12.2.9, shared_ptr specialized algorithms:
template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>& b);
template<class T> void swap(shared_ptr<T>&& a, shared_ptr<T>& b);
template<class T> void swap(shared_ptr<T>& a, shared_ptr<T>&& b);

  11. Change 23.4 [string.classes]/1, header <string> synopsis, as indicated: 

    // 21.4.8.8: swap
template<class charT, class traits, class Allocator>
void swap(basic_string<charT,traits,Allocator>& lhs, basic_string<charT,traits,Allocator>& rhs);
template<class charT, class traits, class Allocator>
void swap(basic_string<charT,traits,Allocator>&& lhs, basic_string<charT,traits,Allocator>& rhs);
template<class charT, class traits, class Allocator>
void swap(basic_string<charT,traits,Allocator>& lhs, basic_string<charT,traits,Allocator>&& rhs);

  12. Change 24.3 [sequences]/1, header <deque> synopsis, as indicated: 

    template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>&& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>&& y);

  13. Change 24.3 [sequences]/1, header <list> synopsis, as indicated: 

    template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>&& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>&& y);

  14. Change 24.3 [sequences]/1, header <queue> synopsis, as indicated: 

    template <class T, class Allocator>
void swap(queue<T, Container>& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>&& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>& x, queue<T, Container>&& y);

template <class T, class Container = vector<T>, class Compare = less<typename Container::value_type> >
class priority_queue;
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>&& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>&& y);

  15. Change 24.3 [sequences]/1, header <stack> synopsis, as indicated: 

    template <class T, class Container>
void swap(stack<T, Container>& x, stack<T, Container>& y);
template <class T, class Container>
void swap(stack<T, Container>&& x, stack<T, Container>& y);
template <class T, class Container>
void swap(stack<T, Container>& x, stack<T, Container>&& y);

  16. Change 24.3 [sequences]/1, header <vector> synopsis, as indicated: 

    template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>&& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>&& y);

  17. Change 24.3.8 [deque]/2 as indicated: 

    iterator erase(const_iterator position);
iterator erase(const_iterator first, const_iterator last);
void swap(deque<T,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>&& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>&& y);

  18. Change [deque.special] as indicated: 

    template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>&& x, deque<T,Allocator>& y);
template <class T, class Allocator>
void swap(deque<T,Allocator>& x, deque<T,Allocator>&& y);

  19. Change [forwardlist]/2 as indicated: 

    iterator erase_after(const_iterator position);
iterator erase_after(const_iterator position, iterator last);
void swap(forward_list<T,Allocator>&&);

[..]

// 23.3.3.6 specialized algorithms:
template <class T, class Allocator>
void swap(forward_list<T,Allocator>& x, forward_list<T,Allocator>& y);
template <class T, class Allocator>
void swap(forward_list<T,Allocator>&& x, forward_list<T,Allocator>& y);
template <class T, class Allocator>
void swap(forward_list<T,Allocator>& x, forward_list<T,Allocator>&& y);

  20. Change [forwardlist.spec] as indicated: 

    template <class T, class Allocator>
void swap(forward_list<T,Allocator>& x, forward_list<T,Allocator>& y);
template <class T, class Allocator>
void swap(forward_list<T,Allocator>&& x, forward_list<T,Allocator>& y);
template <class T, class Allocator>
void swap(forward_list<T,Allocator>& x, forward_list<T,Allocator>&& y);

  21. Change 24.3.10 [list]/2 as indicated: 

    iterator erase(const_iterator position);
iterator erase(const_iterator position, const_iterator last);
void swap(list<T,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>&& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>&& y);

  22. Change [list.special] as indicated: 

    template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>&& x, list<T,Allocator>& y);
template <class T, class Allocator>
void swap(list<T,Allocator>& x, list<T,Allocator>&& y);

  23. Change 24.6.6.1 [queue.defn] as indicated: 

    void swap(queue&& q) { c.swap(q.c); }

[..]

template <class T, class Container>
void swap(queue<T, Container>& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>&& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>& x, queue<T, Container>&& y);

  24. Change 24.6.6.6 [queue.special] as indicated: 

    template <class T, class Container>
void swap(queue<T, Container>& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>&& x, queue<T, Container>& y);
template <class T, class Container>
void swap(queue<T, Container>& x, queue<T, Container>&& y);

  25. Change 24.6.7 [priority.queue]/1 as indicated: 

    void swap(priority_queue&&);

// no equality is provided
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>&& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, class Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>&& y);

  26. Change 24.6.7.5 [priqueue.special] as indicated: 

    template <class T, class Container, Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, Compare>
void swap(priority_queue<T, Container, Compare>&& x, priority_queue<T, Container, Compare>& y);
template <class T, class Container, Compare>
void swap(priority_queue<T, Container, Compare>& x, priority_queue<T, Container, Compare>&& y);

  27. Change 24.6.8.2 [stack.defn] as indicated: 

    void swap(stack&& s) { c.swap(s.c); }

[..]

template <class T, class Allocator>
void swap(stack<T,Allocator>& x, stack<T,Allocator>& y);
template <class T, class Allocator>
void swap(stack<T,Allocator>&& x, stack<T,Allocator>& y);
template <class T, class Allocator>
void swap(stack<T,Allocator>& x, stack<T,Allocator>&& y);

  28. Change 24.6.8.7 [stack.special] as indicated: 

    template <class T, class Container>
void swap(stack<T, Container>& x, stack<T, Container>& y);
template <class T, class Container>
void swap(stack<T, Container>&& x, stack<T, Container>& y);
template <class T, class Container>
void swap(stack<T, Container>& x, stack<T, Container>&& y);

  29. Change 24.3.11 [vector]/2 as indicated: 

    void swap(vector<T,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>&& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>&& y);

  30. Change 24.3.11.3 [vector.capacity] before p. 8 as indicated: 

    void swap(vector<T,Allocator>&& x);

  31. Change [vector.special] as indicated: 

    template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>&& x, vector<T,Allocator>& y);
template <class T, class Allocator>
void swap(vector<T,Allocator>& x, vector<T,Allocator>&& y);

  32. Change 24.3.12 [vector.bool]/1 as indicated: 

    iterator erase(const_iterator first, const_iterator last);
void swap(vector<bool,Allocator>&&);
static void swap(reference x, reference y);

  33. Change 24.4 [associative]/1, header <map> synopsis as indicated: 

    template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator>& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator&& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator& x, map<Key,T,Compare,Allocator>&& y);

[..]

template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator>& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator&& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator& x, multimap<Key,T,Compare,Allocator>&& y);

  34. Change 24.4 [associative]/1, header <set> synopsis as indicated: 

    template <class Key, class Compare, class Allocator>
void swap(set<Key,Compare,Allocator>& x, set<Key,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(set<Key,T,Compare,Allocator&& x, set<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(set<Key,T,Compare,Allocator& x, set<Key,T,Compare,Allocator>&& y);

[..]

template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator>& x, multiset<Key,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multiset<Key,T,Compare,Allocator&& x, multiset<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multiset<Key,T,Compare,Allocator& x, multiset<Key,T,Compare,Allocator>&& y);

  35. Change 24.4.4 [map]/2 as indicated: 

    iterator erase(const_iterator first, const_iterator last);
void swap(map<Key,T,Compare,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator>& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator&& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator& x, map<Key,T,Compare,Allocator>&& y);

  36. Change [map.special] as indicated: 

    template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator>& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator>&& x, map<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(map<Key,T,Compare,Allocator>& x, map<Key,T,Compare,Allocator>&& y);

  37. Change 24.4.5 [multimap]/2 as indicated: 

    iterator erase(const_iterator first, const_iterator last);
void swap(multimap<Key,T,Compare,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator>& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator&& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator& x, multimap<Key,T,Compare,Allocator>&& y);

  38. Change [multimap.special] as indicated: 

    template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator>& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator>&& x, multimap<Key,T,Compare,Allocator>& y);
template <class Key, class T, class Compare, class Allocator>
void swap(multimap<Key,T,Compare,Allocator>& x, multimap<Key,T,Compare,Allocator>&& y);

  39. Change 24.4.6 [set]/2 and [set.special] as indicated: (twice!) 

    // specialized algorithms:
template <class Key, class Compare, class Allocator>
void swap(set<Key,Compare,Allocator>& x, set<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(set<Key,Compare,Allocator&& x, set<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(set<Key,Compare,Allocator& x, set<Key,Compare,Allocator>&& y);

  40. Change 24.4.7 [multiset]/2 as indicated: 

    iterator erase(const_iterator first, const_iterator last);
void swap(multiset<Key,Compare,Allocator>&&);
void clear();

[..]

// specialized algorithms:
template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator>& x, multiset<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator&& x, multiset<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator& x, multiset<Key,Compare,Allocator>&& y);

  41. Change [multiset.special] as indicated: 

    template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator>& x, multiset<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator>&& x, multiset<Key,Compare,Allocator>& y);
template <class Key, class Compare, class Allocator>
void swap(multiset<Key,Compare,Allocator>& x, multiset<Key,Compare,Allocator>&& y);