FlexibleArray.h

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/*
 * Copyright (C) 1996-2023 The Squid Software Foundation and contributors
 *
 * Squid software is distributed under GPLv2+ license and includes
 * contributions from numerous individuals and organizations.
 * Please see the COPYING and CONTRIBUTORS files for details.
 */
 
#ifndef SQUID_IPC_MEM_FLEXIBLE_ARRAY_H
#define SQUID_IPC_MEM_FLEXIBLE_ARRAY_H
 
// sometimes required for placement-new operator to be declared
#include <new>
 
namespace Ipc
{
 
namespace Mem
{
 
template <class Item>
class FlexibleArray
{
public:
    explicit FlexibleArray(const int capacity) {
        if (capacity > 1) // the first item is initialized automatically
            new (raw()+1) Item[capacity-1];
    }
 
    Item &operator [](const int idx) { return items[idx]; }
    const Item &operator [](const int idx) const { return items[idx]; }
 
    //const Item *operator ()() const { return items; }
    //Item *operator ()() { return items; }
 
    Item *raw() { return items; }
 
private:
    Item items[1]; // ensures proper alignment of array elements
};
 
} // namespace Mem
 
} // namespace Ipc
 
#endif /* SQUID_IPC_MEM_FLEXIBLE_ARRAY_H */