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// Copyright (c) 2009 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 CHROME_BROWSER_SYNC_NOTIFIER_BASE_FASTALLOC_H_
#define CHROME_BROWSER_SYNC_NOTIFIER_BASE_FASTALLOC_H_
#include <assert.h>
namespace notifier {
template<class T, size_t Size>
class FastAlloc {
public:
FastAlloc() : buffer_(NULL), size_(0) { }
~FastAlloc() { freeBuffer(); }
T* get_buffer(size_t size) {
if (size_ != 0) {
// We only allow one call to get_buffer. This makes the logic here
// simpler, and the user has to worry less about someone else calling
// get_buffer again on the same FastAlloc object and invalidating the
// memory they were using.
assert(false && "get_buffer may one be called once");
return NULL;
}
if (size <= Size) {
buffer_ = internal_buffer_;
} else {
buffer_ = new T[size];
}
if (buffer_ != NULL) {
size_ = size;
}
return buffer_;
}
private:
void freeBuffer() {
#if defined(DEBUG)
memset(buffer_, 0xCC, size_ * sizeof(T));
#endif
if (buffer_ != NULL && buffer_ != internal_buffer_) {
delete[] buffer_;
}
buffer_ = NULL;
size_ = 0;
}
T* buffer_;
T internal_buffer_[Size];
size_t size_;
};
}
#endif // CHROME_BROWSER_SYNC_NOTIFIER_BASE_FASTALLOC_H_
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