src/third_party/WebKit/Source/platform/heap/HeapTerminatedArray.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef HeapTerminatedArray_h
   6 #define HeapTerminatedArray_h
   7
   8 #include "platform/heap/Heap.h"
   9 #include "wtf/TerminatedArray.h"
  10 #include "wtf/TerminatedArrayBuilder.h"
  11
  12 namespace blink {
  13
  14 template<typename T>
  15 class HeapTerminatedArray : public TerminatedArray<T> {
  16     DISALLOW_ALLOCATION();
  17 public:
  18     using TerminatedArray<T>::begin;
  19     using TerminatedArray<T>::end;
  20
  21     void trace(Visitor* visitor)
  22     {
  23         for (typename TerminatedArray<T>::iterator it = begin(); it != end(); ++it)
  24             visitor->trace(*it);
  25     }
  26
  27 private:
  28     // Allocator describes how HeapTerminatedArrayBuilder should create new intances
  29     // of TerminateArray and manage their lifetimes.
  30     struct Allocator {
  31         typedef HeapTerminatedArray* PassPtr;
  32         typedef RawPtr<HeapTerminatedArray> Ptr;
  33
  34         static PassPtr create(size_t capacity)
  35         {
  36             return reinterpret_cast<HeapTerminatedArray*>(Heap::allocate<HeapTerminatedArray>(capacity * sizeof(T)));
  37         }
  38
  39         static PassPtr resize(PassPtr ptr, size_t capacity)
  40         {
  41             return reinterpret_cast<HeapTerminatedArray*>(Heap::reallocate<HeapTerminatedArray>(ptr, capacity * sizeof(T)));
  42         }
  43     };
  44
  45     // Prohibit construction. Allocator makes HeapTerminatedArray instances for
  46     // HeapTerminatedArrayBuilder by pointer casting.
  47     HeapTerminatedArray();
  48
  49     template<typename U, template <typename> class> friend class WTF::TerminatedArrayBuilder;
  50 };
  51
  52 } // namespace blink
  53
  54 #endif // HeapTerminatedArray_h