# Standard library header <experimental/memory_resource>

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This header is part of the experimental library.

### Classes

Defined in namespace `std::experimental::pmr`
memory_resource | an abstract interface for classes that encapsulate memory resources (class)
synchronized_pool_resource | a thread-safe memory_resource for managing allocations in pools of different block sizes (class)
unsynchronized_pool_resource | a thread-unsafe memory_resource for managing allocations in pools of different block sizes (class)
monotonic_buffer_resource | a special-purpose memory_resource that releases the allocated memory only when the resource is destroyed (class)
polymorphic_allocator | an allocator that supports run-time polymorphism based on the memory_resource it is constructed with (class template)
resource_adaptor | adapts an allocator into a memory_resource (alias template)

### Functions

Defined in namespace `std::experimental::pmr`

##### Comparison

operator==operator!= | compare two `memory_resource`s (function)
operator==operator!= | compares two allocators (function template)

##### Global memory resources

new_delete_resource | returns a static program-wide `memory_resource` that uses the global operator new and operator delete to allocate and deallocate memory (function)
null_memory_resource | returns a static `memory_resource` that performs no allocation (function)

##### Default memory resource

get_default_resource | gets the default `memory_resource` (function)
set_default_resource | sets the default `memory_resource` (function)

### Synopsis

    namespace std {
    namespace experimental {
    inline namespace fundamentals_v1 {
    namespace pmr {

      class memory_resource;

      bool operator==(const memory_resource& a,
                      const memory_resource& b) noexcept;
      bool operator!=(const memory_resource& a,
                      const memory_resource& b) noexcept;

      template <class Tp> class polymorphic_allocator;

      template <class T1, class T2>
      bool operator==(const polymorphic_allocator<T1>& a,
                      const polymorphic_allocator<T2>& b) noexcept;
      template <class T1, class T2>
      bool operator!=(const polymorphic_allocator<T1>& a,
                      const polymorphic_allocator<T2>& b) noexcept;

      // The name resource_adaptor_imp is for exposition only.
      template <class Allocator> class resource_adaptor_imp;

      template <class Allocator>
        using resource_adaptor = resource_adaptor_imp<
          typename allocator_traits<Allocator>::template rebind_alloc<char>>;

      // Global memory resources
      memory_resource* new_delete_resource() noexcept;
      memory_resource* null_memory_resource() noexcept;

      // The default memory resource
      memory_resource* set_default_resource(memory_resource* r) noexcept;
      memory_resource* get_default_resource() noexcept;

      // Standard memory resources
      struct pool_options;
      class synchronized_pool_resource;
      class unsynchronized_pool_resource;
      class monotonic_buffer_resource;

    } // namespace pmr
    } // namespace fundamentals_v1
    } // namespace experimental
    } // namespace std

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