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Section: 20.4.1.7 [indirect.swap], 20.4.2.7 [polymorphic.swap] Status: New Submitter: Jonathan Wakely Opened: 2025-05-01 Last modified: 2025-05-01
The non-member swap overloads for std::indirect and std::polymorphic are defined as hidden friends, so are only available via ADL. This means that calling std::swap(i1, i2) will always use the generic std::swap instead of the custom overload for std::indirect.
Modify 20.2.2 [memory.syn] as indicated:
// 20.4.1, class template indirect template<class T, class Allocator = allocator<T>> class indirect; template<class T, class Allocator> constexpr void swap(indirect<T, Allocator>& lhs, indirect<T, Allocator>& rhs) noexcept(see below); // 20.4.1.10, hash support template<class T, class Alloc> struct hash<indirect<T, Alloc>>; // 20.4.2, class template polymorphic template<class T, class Allocator = allocator<T>> class polymorphic; template<class T, class Allocator> constexpr void swap(polymorphic<T, Allocator>& lhs, polymorphic<T, Allocator>& rhs) noexcept(see below);
Modify 20.4.1.2 [indirect.syn] as indicated:
// 20.4.1.7, swap constexpr void swap(indirect& other) noexcept(see below); friend constexpr void swap(indirect& lhs, indirect& rhs) noexcept(see below);
Modify 20.4.1.7 [indirect.swap] as indicated:
template<class T, class Allocator> constexpr void swap(indirect<T, Allocator>& lhs, indirect<T, Allocator>& rhs) noexcept(noexcept(lhs.swap(rhs)));-3- Effects: Equivalent tolhs.swap(rhs).
Modify 20.4.2.2 [polymorphic.syn] as indicated:
// 20.4.2.7, swap constexpr void swap(polymorphic& other) noexcept(see below); friend constexpr void swap(polymorphic& lhs, polymorphic& rhs) noexcept(see below);
Modify 20.4.2.7 [polymorphic.swap] as indicated:
template<class T, class Allocator> constexpr void swap(polymorphic<T, Allocator>& lhs, polymorphic<T, Allocator>& rhs) noexcept(noexcept(lhs.swap(rhs)));-3- Effects: Equivalent tolhs.swap(rhs).
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