base/memory/discardable_memory_allocator.cc

   1 // Copyright 2015 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 #include "base/memory/discardable_memory_allocator.h"
   6
   7 #include "base/logging.h"
   8
   9 namespace base {
  10 namespace {
  11
  12 DiscardableMemoryAllocator* g_allocator = nullptr;
  13
  14 }  // namespace
  15
  16 // static
  17 void DiscardableMemoryAllocator::SetInstance(
  18     DiscardableMemoryAllocator* allocator) {
  19   DCHECK(allocator);
  20
  21   // Make sure this function is only called once before the first call
  22   // to GetInstance().
  23   DCHECK(!g_allocator);
  24
  25   g_allocator = allocator;
  26 }
  27
  28 // static
  29 DiscardableMemoryAllocator* DiscardableMemoryAllocator::GetInstance() {
  30   DCHECK(g_allocator);
  31   return g_allocator;
  32 }
  33
  34 }  // namespace base