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// Copyright 2015 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_
#define COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_
#include <stddef.h>
#include <type_traits>
namespace metrics {
namespace leak_detector {
// Custom allocator class to be passed to STLAllocator as a template argument.
//
// By default, CustomAllocator uses the default allocator (new/delete), but the
// caller of Initialize ()can provide a pair of alternative alloc/ free
// functions to use as an external allocator.
//
// This is a stateless class, but there is static data within the module that
// needs to be created and deleted.
//
// Not thread-safe.
class CustomAllocator {
public:
using AllocFunc = std::add_pointer<void*(size_t)>::type;
using FreeFunc = std::add_pointer<void(void*, size_t)>::type;
// Initialize CustomAllocator to use the default allocator.
static void Initialize();
// Initialize CustomAllocator to use the given alloc/free functions.
static void Initialize(AllocFunc alloc_func, FreeFunc free_func);
// Performs any cleanup required, e.g. unset custom functions. Returns true
// on success or false if something failed.
static bool Shutdown();
static bool IsInitialized();
// These functions must match the specifications in STLAllocator.
static void* Allocate(size_t size);
static void Free(void* ptr, size_t size);
};
} // namespace leak_detector
} // namespace metrics
#endif // COMPONENTS_METRICS_LEAK_DETECTOR_CUSTOM_ALLOCATOR_H_
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