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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_STL_ALLOCATOR_H_
#define COMPONENTS_METRICS_LEAK_DETECTOR_STL_ALLOCATOR_H_
#include <stddef.h>
#include <limits>
#include <memory>
#include "base/logging.h"
// Generic allocator class for STL objects.
// deallocate() to use the template class Alloc's allocation.
// that uses a given type-less allocator Alloc, which must provide:
// static void* Alloc::Allocate(size_t size);
// static void Alloc::Free(void* ptr, size_t size);
//
// Inherits from the default allocator, std::allocator. Overrides allocate() and
// deallocate() and some other functions.
//
// STLAllocator<T, MyAlloc> provides the same thread-safety guarantees as
// MyAlloc.
//
// Usage example:
// set<T, less<T>, STLAllocator<T, MyAlloc> > my_set;
template <typename T, class Alloc>
class STLAllocator : public std::allocator<T> {
public:
typedef size_t size_type;
typedef T* pointer;
template <class T1>
struct rebind {
typedef STLAllocator<T1, Alloc> other;
};
STLAllocator() {}
explicit STLAllocator(const STLAllocator&) {}
template <class T1>
STLAllocator(const STLAllocator<T1, Alloc>&) {}
~STLAllocator() {}
pointer allocate(size_type n, const void* = 0) {
// Make sure the computation of the total allocation size does not cause an
// integer overflow.
RAW_CHECK(n < max_size());
return static_cast<T*>(Alloc::Allocate(n * sizeof(T)));
}
void deallocate(pointer p, size_type n) { Alloc::Free(p, n * sizeof(T)); }
size_type max_size() const {
return std::numeric_limits<size_t>::max() / sizeof(T);
}
};
#endif // COMPONENTS_METRICS_LEAK_DETECTOR_STL_ALLOCATOR_H_
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