From 6cc6ac44e065b9e8975fadfd6ccb99cbcf89aac4 Mon Sep 17 00:00:00 2001
From: Abseil Team <absl-team@google.com>
Date: Fri, 5 Apr 2019 09:05:22 -0700
Subject: Export of internal Abseil changes. --
 4a7dc9bd72a50f493671ea3ae2a571462cb70fc4 by Jon Cohen <cohenjon@google.com>:

Use -ignore instead of /ignore.  CMake was interpreting /ignore as a path and changing it it \ignore in windows builds, expecting it to be some sort of file.

Close #293

PiperOrigin-RevId: 242134552

--
8de3e403667f677859584bb321ef8fce3253af18 by CJ Johnson <johnsoncj@google.com>:

In InlinedVector: Migrates `Rep` to `Data` getting rid of the `Allocation` class.

PiperOrigin-RevId: 242130255
GitOrigin-RevId: 4a7dc9bd72a50f493671ea3ae2a571462cb70fc4
Change-Id: Ic7ff4c572bba7a411155bf304b9cae10d68599db
---
 absl/container/internal/inlined_vector.h | 95 +++++++++++++-------------------
 1 file changed, 38 insertions(+), 57 deletions(-)

(limited to 'absl/container/internal/inlined_vector.h')

diff --git a/absl/container/internal/inlined_vector.h b/absl/container/internal/inlined_vector.h
index 7aa05b6..168d5b4 100644
--- a/absl/container/internal/inlined_vector.h
+++ b/absl/container/internal/inlined_vector.h
@@ -33,8 +33,6 @@ template <template <typename, size_t, typename> class InlinedVector, typename T,
           size_t N, typename A>
 class Storage<InlinedVector<T, N, A>> {
  public:
-  class Allocation;  // TODO(johnsoncj): Remove after migration
-
   using allocator_type = A;
   using value_type = typename allocator_type::value_type;
   using pointer = typename allocator_type::pointer;
@@ -48,6 +46,7 @@ class Storage<InlinedVector<T, N, A>> {
   using const_iterator = const_pointer;
   using reverse_iterator = std::reverse_iterator<iterator>;
   using const_reverse_iterator = std::reverse_iterator<const_iterator>;
+  using AllocatorTraits = std::allocator_traits<allocator_type>;
 
   explicit Storage(const allocator_type& alloc)
       : metadata_(alloc, /* empty and inlined */ 0) {}
@@ -56,30 +55,25 @@ class Storage<InlinedVector<T, N, A>> {
 
   bool GetIsAllocated() const { return GetSizeAndIsAllocated() & 1; }
 
-  Allocation& GetAllocation() {
-    return reinterpret_cast<Allocation&>(rep_.allocation_storage.allocation);
-  }
-
-  const Allocation& GetAllocation() const {
-    return reinterpret_cast<const Allocation&>(
-        rep_.allocation_storage.allocation);
-  }
-
   pointer GetInlinedData() {
     return reinterpret_cast<pointer>(
-        std::addressof(rep_.inlined_storage.inlined[0]));
+        std::addressof(data_.inlined.inlined_data[0]));
   }
 
   const_pointer GetInlinedData() const {
     return reinterpret_cast<const_pointer>(
-        std::addressof(rep_.inlined_storage.inlined[0]));
+        std::addressof(data_.inlined.inlined_data[0]));
   }
 
-  pointer GetAllocatedData() { return GetAllocation().buffer(); }
+  pointer GetAllocatedData() { return data_.allocated.allocated_data; }
 
-  const_pointer GetAllocatedData() const { return GetAllocation().buffer(); }
+  const_pointer GetAllocatedData() const {
+    return data_.allocated.allocated_data;
+  }
 
-  size_type GetAllocatedCapacity() const { return GetAllocation().capacity(); }
+  size_type GetAllocatedCapacity() const {
+    return data_.allocated.allocated_capacity;
+  }
 
   allocator_type& GetAllocator() { return metadata_.template get<0>(); }
 
@@ -95,34 +89,23 @@ class Storage<InlinedVector<T, N, A>> {
 
   void AddSize(size_type count) { GetSizeAndIsAllocated() += count << 1; }
 
-  void InitAllocation(const Allocation& allocation) {
-    new (static_cast<void*>(std::addressof(rep_.allocation_storage.allocation)))
-        Allocation(allocation);
+  void SetAllocatedData(pointer data) {
+    data_.allocated.allocated_data = data;
+  }
+
+  void SetAllocatedCapacity(size_type capacity) {
+    data_.allocated.allocated_capacity = capacity;
   }
 
-  void SwapSizeAndIsAllocated(Storage& other) {
+  void SwapSizeAndIsAllocated(Storage* other) {
     using std::swap;
-    swap(GetSizeAndIsAllocated(), other.GetSizeAndIsAllocated());
+    swap(GetSizeAndIsAllocated(), other->GetSizeAndIsAllocated());
   }
 
-  // TODO(johnsoncj): Make the below types private after migration
-  class Allocation {
-    size_type capacity_;
-    pointer buffer_;
-
-   public:
-    Allocation(allocator_type& a, size_type capacity)
-        : capacity_(capacity), buffer_(Create(a, capacity)) {}
-    void Dealloc(allocator_type& a) {
-      std::allocator_traits<allocator_type>::deallocate(a, buffer_, capacity_);
-    }
-    size_type capacity() const { return capacity_; }
-    const_pointer buffer() const { return buffer_; }
-    pointer buffer() { return buffer_; }
-    static pointer Create(allocator_type& a, size_type n) {
-      return std::allocator_traits<allocator_type>::allocate(a, n);
-    }
-  };
+  void SwapAllocatedSizeAndCapacity(Storage* other) {
+    using std::swap;
+    swap(data_.allocated, other->data_.allocated);
+  }
 
  private:
   size_type& GetSizeAndIsAllocated() { return metadata_.template get<1>(); }
@@ -131,29 +114,27 @@ class Storage<InlinedVector<T, N, A>> {
     return metadata_.template get<1>();
   }
 
-  // Stores either the inlined or allocated representation
-  union Rep {
-    using ValueTypeBuffer =
-        absl::aligned_storage_t<sizeof(value_type), alignof(value_type)>;
-    using AllocationBuffer =
-        absl::aligned_storage_t<sizeof(Allocation), alignof(Allocation)>;
+  using Metadata =
+      container_internal::CompressedTuple<allocator_type, size_type>;
 
-    // Structs wrap the buffers to perform indirection that solves a bizarre
-    // compilation error on Visual Studio (all known versions).
-    struct InlinedRep {
-      ValueTypeBuffer inlined[N];
-    };
+  struct Allocated {
+    pointer allocated_data;
+    size_type allocated_capacity;
+  };
 
-    struct AllocatedRep {
-      AllocationBuffer allocation;
-    };
+  struct Inlined {
+    using InlinedDataElement =
+        absl::aligned_storage_t<sizeof(value_type), alignof(value_type)>;
+    InlinedDataElement inlined_data[N];
+  };
 
-    InlinedRep inlined_storage;
-    AllocatedRep allocation_storage;
+  union Data {
+    Allocated allocated;
+    Inlined inlined;
   };
 
-  container_internal::CompressedTuple<allocator_type, size_type> metadata_;
-  Rep rep_;
+  Metadata metadata_;
+  Data data_;
 };
 
 }  // namespace inlined_vector_internal
-- 
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