110 template <typename T> class SwapAllocator;  variable
113 class SwapAllocator<void> {
121     typedef SwapAllocator<U> other;
124   explicit SwapAllocator(SwapSpace* swap_space) : swap_space_(swap_space) {}  in SwapAllocator()  function
127   SwapAllocator(const SwapAllocator<U>& other)  // NOLINT, implicit  in SwapAllocator()  function
130   SwapAllocator(const SwapAllocator& other) = default;
131   SwapAllocator& operator=(const SwapAllocator& other) = default;
132   ~SwapAllocator() = default;
138   friend class SwapAllocator;  variable
141   friend bool operator==(const SwapAllocator<U>& lhs, const SwapAllocator<U>& rhs);
145 class SwapAllocator {
157     typedef SwapAllocator<U> other;
160   explicit SwapAllocator(SwapSpace* swap_space) : swap_space_(swap_space) {}  in SwapAllocator()  function
163   SwapAllocator(const SwapAllocator<U>& other)  // NOLINT, implicit  in SwapAllocator()  function
166   SwapAllocator(const SwapAllocator& other) = default;
167   SwapAllocator& operator=(const SwapAllocator& other) = default;
168   ~SwapAllocator() = default;
177   pointer allocate(size_type n, SwapAllocator<void>::pointer hint ATTRIBUTE_UNUSED = nullptr) {
206   inline bool operator==(SwapAllocator const& other) {
209   inline bool operator!=(SwapAllocator const& other) {
217   friend class SwapAllocator;  variable
220   friend bool operator==(const SwapAllocator<U>& lhs, const SwapAllocator<U>& rhs);
224 inline bool operator==(const SwapAllocator<T>& lhs, const SwapAllocator<T>& rhs) {
229 inline bool operator!=(const SwapAllocator<T>& lhs, const SwapAllocator<T>& rhs) {
234 using SwapVector = std::vector<T, SwapAllocator<T>>;
236 using SwapSet = std::set<T, Comparator, SwapAllocator<T>>;