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[mem.res.syn]
20 Memory management library [mem]
20.5 Memory resources [mem.res]
20.5.1 Header <memory_resource> synopsis [mem.res.syn]
namespace std::pmr {// [mem.res.class], class memory_resourceclass memory_resource; bool operator==(const memory_resource& a, const memory_resource& b) noexcept; // [mem.poly.allocator.class], class template polymorphic_allocatortemplate class polymorphic_allocator; template<class T1, class T2>bool operator==(const polymorphic_allocator& a, const polymorphic_allocator& b) noexcept; // [mem.res.global], global memory resources memory_resource* new_delete_resource() noexcept; memory_resource* null_memory_resource() noexcept; memory_resource* set_default_resource(memory_resource* r) noexcept; memory_resource* get_default_resource() noexcept; // [mem.res.pool], pool resource classesstruct pool_options; class synchronized_pool_resource; class unsynchronized_pool_resource; class monotonic_buffer_resource;}