Init

cppdraft/polymorphic/swap.md

@@ -0,0 +1,55 @@
+[polymorphic.swap]
+
+# 20 Memory management library [[mem]](./#mem)
+
+## 20.4 Types for composite class design [[mem.composite.types]](mem.composite.types#polymorphic.swap)
+
+### 20.4.2 Class template polymorphic [[polymorphic]](polymorphic#swap)
+
+#### 20.4.2.7 Swap [polymorphic.swap]
+
+[🔗](#lib:swap,polymorphic)
+
+`constexpr void swap(polymorphic& other)
+  noexcept(allocator_traits<Allocator>::propagate_on_container_swap::value ||
+           allocator_traits<Allocator>::is_always_equal::value);
+`
+
+[1](#1)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7412)
+
+*Preconditions*: If allocator_traits<Allocator>​::​propagate_on_container_swap​::​value is true, thenAllocator meets the *Cpp17Swappable* requirements[.](#1.sentence-1)
+
+Otherwise get_allocator() == other.  
+get_allocator() is true[.](#1.sentence-2)
+
+[2](#2)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7419)
+
+*Effects*: Swaps the states of *this and other,
+exchanging owned objects or valueless states[.](#2.sentence-1)
+
+If allocator_traits<Allocator>​::​propagate_on_container_swap​::​value is true, then
+the allocators of *this and other are exchanged by calling swap as described in [[swappable.requirements]](swappable.requirements "16.4.4.3 Swappable requirements")[.](#2.sentence-2)
+
+Otherwise,
+the allocators are not swapped[.](#2.sentence-3)
+
+[*Note [1](#note-1)*:
+
+Does not call swap on the owned objects directly[.](#2.sentence-4)
+
+— *end note*]
+
+[🔗](#itemdecl:2)
+
+`constexpr void swap(polymorphic& lhs, polymorphic& rhs) noexcept(noexcept(lhs.swap(rhs)));
+`
+
+[3](#3)
+
+[#](http://github.com/Eelis/draft/tree/9adde4bc1c62ec234483e63ea3b70a59724c745a/source/memory.tex#L7442)
+
+*Effects*: Equivalent to lhs.swap(rhs)[.](#3.sentence-1)