Update FB Allocator

include/metall/container/fallback_allocator.hpp

@@ -12,43 +12,42 @@
 
 namespace metall::container {
 
-/// \brief A STL compatible allocator which fallbacks to a heap allocator (e.g.,
-/// malloc()) if its constructor receives no argument to construct the stateful
-/// allocator instance.
-/// \tparam stateful_allocator The stateful allocator type. It must not be
+/// \brief A Metall STL compatible allocator which fallbacks to a heap allocator
+/// (e.g., malloc()) if its constructor receives no argument to construct the
+/// stateful allocator (Metall's normal STL compatible allocator) instance.
+/// \tparam StatefulAllocator The stateful allocator type. It must not be
 /// default constructible.
-template <typename stateful_allocator>
+template <typename StatefulAllocator>
 class fallback_allocator_adaptor {
-  // Check if the stateful_allocator takes arugments in its constructor
-  static_assert(!std::is_constructible<stateful_allocator>::value,
+  // Check if the StatefulAllocator takes arguments in its constructor
+  static_assert(!std::is_constructible<StatefulAllocator>::value,
                 "The stateful allocator must not be default constructible");
 
  private:
   template <typename T>
-  using other_stateful_allocatorator_type = typename std::allocator_traits<
-      stateful_allocator>::template rebind_alloc<T>;
+  using other_stateful_allocator_type = typename std::allocator_traits<
+      StatefulAllocator>::template rebind_alloc<T>;
 
  public:
   // -------------------- //
   // Public types and static values
   // -------------------- //
-  using stateful_allocatorator_type = typename std::remove_const<
-      typename std::remove_reference<stateful_allocator>::type>::type;
+  using stateful_allocator_type = typename std::remove_const<
+      typename std::remove_reference<StatefulAllocator>::type>::type;
 
-  using value_type = typename stateful_allocatorator_type::value_type;
-  using pointer = typename stateful_allocatorator_type::pointer;
-  using const_pointer = typename stateful_allocatorator_type::const_pointer;
-  using void_pointer = typename stateful_allocatorator_type::void_pointer;
+  using value_type = typename stateful_allocator_type::value_type;
+  using pointer = typename stateful_allocator_type::pointer;
+  using const_pointer = typename stateful_allocator_type::const_pointer;
+  using void_pointer = typename stateful_allocator_type::void_pointer;
   using const_void_pointer =
-      typename stateful_allocatorator_type::const_void_pointer;
-  using difference_type = typename stateful_allocatorator_type::difference_type;
-  using size_type = typename stateful_allocatorator_type::size_type;
+      typename stateful_allocator_type::const_void_pointer;
+  using difference_type = typename stateful_allocator_type::difference_type;
+  using size_type = typename stateful_allocator_type::size_type;
 
   /// \brief Makes another allocator type for type T2
   template <typename T2>
   struct rebind {
-    using other =
-        fallback_allocator_adaptor<other_stateful_allocatorator_type<T2>>;
+    using other = fallback_allocator_adaptor<other_stateful_allocator_type<T2>>;
   };
 
  public:
@@ -58,30 +57,30 @@ class fallback_allocator_adaptor {
 
   /// \brief Default constructor which falls back on the regular allocator
   /// (i.e., malloc()).
-  fallback_allocator_adaptor() noexcept : m_stateful_allocatorator(nullptr) {}
+  fallback_allocator_adaptor() noexcept : m_stateful_allocator(nullptr) {}
 
   /// \brief Construct a new instance using an instance of
-  /// fallback_allocator_adaptor with any stateful_allocatorator type.
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// fallback_allocator_adaptor with any stateful_allocator type.
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor(
-      fallback_allocator_adaptor<stateful_allocatorator_type2>
+      fallback_allocator_adaptor<stateful_allocator_type2>
           allocator_instance) noexcept
-      : m_stateful_allocatorator(allocator_instance.stateful_allocatorator()) {}
+      : m_stateful_allocator(allocator_instance.get_stateful_allocator()) {}
 
   /// \brief Construct a new instance using an instance of any
-  /// stateful_allocatorator.
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// stateful_allocator.
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor(
-      stateful_allocatorator_type2 allocator_instance) noexcept
-      : m_stateful_allocatorator(allocator_instance) {}
+      stateful_allocator_type2 allocator_instance) noexcept
+      : m_stateful_allocator(allocator_instance) {}
 
   /// \brief Copy constructor
   fallback_allocator_adaptor(const fallback_allocator_adaptor &other) noexcept =
@@ -96,28 +95,28 @@ class fallback_allocator_adaptor {
       const fallback_allocator_adaptor &) noexcept = default;
 
   /// \brief Copy assign operator, using an instance of
-  /// fallback_allocator_adaptor with any stateful_allocatorator type
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// fallback_allocator_adaptor with any stateful_allocator type
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor &operator=(
-      const fallback_allocator_adaptor<stateful_allocatorator_type2>
+      const fallback_allocator_adaptor<stateful_allocator_type2>
           &other) noexcept {
-    m_stateful_allocatorator = other.stateful_allocatorator();
+    m_stateful_allocator = other.stateful_allocator();
     return *this;
   }
 
-  /// \brief Copy assign operator for any stateful_allocatorator
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// \brief Copy assign operator for any stateful_allocator
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor &operator=(
-      const stateful_allocatorator_type2 &allocator_instance) noexcept {
-    m_stateful_allocatorator = allocator_instance;
+      const stateful_allocator_type2 &allocator_instance) noexcept {
+    m_stateful_allocator = allocator_instance;
     return *this;
   }
 
@@ -126,37 +125,36 @@ class fallback_allocator_adaptor {
       fallback_allocator_adaptor &&other) noexcept = default;
 
   /// \brief Move assign operator, using an instance of
-  /// fallback_allocator_adaptor with any stateful_allocatorator type
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// fallback_allocator_adaptor with any stateful_allocator type
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor &operator=(
-      fallback_allocator_adaptor<stateful_allocatorator_type2>
-          &&other) noexcept {
-    m_stateful_allocatorator = std::move(other.stateful_allocatorator());
+      fallback_allocator_adaptor<stateful_allocator_type2> &&other) noexcept {
+    m_stateful_allocator = std::move(other.stateful_allocator());
     return *this;
   }
 
-  /// \brief Move assign operator for any stateful_allocatorator
-  template <typename stateful_allocatorator_type2,
-            std::enable_if_t<
-                std::is_constructible<stateful_allocator,
-                                      stateful_allocatorator_type2>::value,
-                int> = 0>
+  /// \brief Move assign operator for any stateful_allocator
+  template <
+      typename stateful_allocator_type2,
+      std::enable_if_t<std::is_constructible<stateful_allocator_type,
+                                             stateful_allocator_type2>::value,
+                       int> = 0>
   fallback_allocator_adaptor &operator=(
-      stateful_allocatorator_type2 &&allocator_instance) noexcept {
-    m_stateful_allocatorator = std::move(allocator_instance);
+      stateful_allocator_type2 &&allocator_instance) noexcept {
+    m_stateful_allocator = std::move(allocator_instance);
     return *this;
   }
 
   /// \brief Allocates n * sizeof(T) bytes of storage
   /// \param n The size to allocation
   /// \return Returns a pointer
   pointer allocate(const size_type n) const {
-    if (priv_stateful_allocatorator_available()) {
-      return m_stateful_allocatorator.allocate(n);
+    if (priv_stateful_allocator_available()) {
+      return m_stateful_allocator.allocate(n);
     }
     return priv_fallback_allocate(n);
   }
@@ -165,8 +163,8 @@ class fallback_allocator_adaptor {
   /// \param ptr A pointer to the storage
   /// \param size The size of the storage
   void deallocate(pointer ptr, const size_type size) const {
-    if (priv_stateful_allocatorator_available()) {
-      m_stateful_allocatorator.deallocate(ptr, size);
+    if (priv_stateful_allocator_available()) {
+      m_stateful_allocator.deallocate(ptr, size);
     } else {
       priv_fallback_deallocate(ptr);
     }
@@ -175,7 +173,7 @@ class fallback_allocator_adaptor {
   /// \brief The size of the theoretical maximum allocation size
   /// \return The size of the theoretical maximum allocation size
   size_type max_size() const noexcept {
-    return m_stateful_allocatorator.max_size();
+    return m_stateful_allocator.max_size();
   }
 
   /// \brief Constructs an object of T
@@ -184,8 +182,8 @@ class fallback_allocator_adaptor {
   /// \param args The constructor arguments to use
   template <class... Args>
   void construct(const pointer &ptr, Args &&...args) const {
-    if (priv_stateful_allocatorator_available()) {
-      m_stateful_allocatorator.construct(ptr, std::forward<Args>(args)...);
+    if (priv_stateful_allocator_available()) {
+      m_stateful_allocator.construct(ptr, std::forward<Args>(args)...);
     } else {
       priv_fallback_construct(ptr, std::forward<Args>(args)...);
     }
@@ -194,28 +192,35 @@ class fallback_allocator_adaptor {
   /// \brief Deconstruct an object of T
   /// \param ptr A pointer to the object
   void destroy(const pointer &ptr) const {
-    if (priv_stateful_allocatorator_available()) {
-      m_stateful_allocatorator.destroy(ptr);
+    if (priv_stateful_allocator_available()) {
+      m_stateful_allocator.destroy(ptr);
     } else {
       priv_fallback_destroy(ptr);
     }
   }
 
   // ---------- This class's unique public functions ---------- //
-  stateful_allocatorator_type &stateful_allocatorator() {
-    return m_stateful_allocatorator;
+
+  /// \brief Returns a reference to the stateful allocator.
+  stateful_allocator_type &get_stateful_allocator() { return m_stateful_allocator; }
+
+  /// \brief Returns a const reference to the stateful allocator.
+  const stateful_allocator_type &get_stateful_allocator() const {
+    return m_stateful_allocator;
   }
 
-  const stateful_allocatorator_type &stateful_allocatorator() const {
-    return m_stateful_allocatorator;
+  /// \brief Returns true if the stateful allocator is available.
+  /// \return Returns true if the stateful allocator is available.
+  bool stateful_allocator_available() const {
+    return priv_stateful_allocator_available();
   }
 
  private:
   // -------------------- //
   // Private methods
   // -------------------- //
-  auto priv_stateful_allocatorator_available() const {
-    return !!(m_stateful_allocatorator.get_pointer_to_manager_kernel());
+  auto priv_stateful_allocator_available() const {
+    return !!(m_stateful_allocator.get_pointer_to_manager_kernel());
   }
 
   pointer priv_fallback_allocate(const size_type n) const {
@@ -246,21 +251,21 @@ class fallback_allocator_adaptor {
   // -------------------- //
   // Private fields
   // -------------------- //
-  stateful_allocatorator_type m_stateful_allocatorator;
+  stateful_allocator_type m_stateful_allocator;
 };
 
-template <typename stateful_allocatorator_type>
+template <typename stateful_allocator_type>
 inline bool operator==(
-    const fallback_allocator_adaptor<stateful_allocatorator_type> &rhd,
-    const fallback_allocator_adaptor<stateful_allocatorator_type> &lhd) {
+    const fallback_allocator_adaptor<stateful_allocator_type> &rhd,
+    const fallback_allocator_adaptor<stateful_allocator_type> &lhd) {
   // Return true if they point to the same manager kernel
-  return rhd.stateful_allocatorator() == lhd.stateful_allocatorator();
+  return rhd.get_stateful_allocator() == lhd.get_stateful_allocator();
 }
 
-template <typename stateful_allocatorator_type>
+template <typename stateful_allocator_type>
 inline bool operator!=(
-    const fallback_allocator_adaptor<stateful_allocatorator_type> &rhd,
-    const fallback_allocator_adaptor<stateful_allocatorator_type> &lhd) {
+    const fallback_allocator_adaptor<stateful_allocator_type> &rhd,
+    const fallback_allocator_adaptor<stateful_allocator_type> &lhd) {
   return !(rhd == lhd);
 }
 

test/container/fallback_allocator_test.cpp

@@ -107,6 +107,27 @@ TEST(FallbackAllocatorAdaptorTest, Types) {
             alloc);
     GTEST_ASSERT_EQ(alloc, a2);
   }
+
+  {
+    metall::manager manager(metall::create_only, dir_path(),
+                            1UL << 27UL);
+    auto allocator = fb_alloc_type<int>(manager.get_allocator<int>());
+    ASSERT_EQ(allocator.get_stateful_allocator(), manager.get_allocator<int>());
+  }
+}
+
+TEST(FallbackAllocatorAdaptorTest, Availability) {
+  {
+    fb_alloc_type<int> allocator;
+    ASSERT_TRUE(!allocator.stateful_allocator_available());
+  }
+
+  {
+    metall::manager manager(metall::create_only, dir_path(),
+                            1UL << 27UL);
+    auto allocator = fb_alloc_type<int>(manager.get_allocator<int>());
+    ASSERT_TRUE(allocator.stateful_allocator_available());
+  }
 }
 
 TEST(FallbackAllocatorAdaptorTest, Exception) {