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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2021 The Bitcoin Core developers
// Distributed under the MIT software license, see the accompanying
// file COPYING or http://www.opensource.org/licenses/mit-license.php.
#ifndef BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
#define BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
#include <support/cleanse.h>
#include <memory>
#include <vector>
template <typename T>
struct zero_after_free_allocator : public std::allocator<T> {
using base = std::allocator<T>;
using traits = std::allocator_traits<base>;
using size_type = typename traits::size_type;
using difference_type = typename traits::difference_type;
using pointer = typename traits::pointer;
using const_pointer = typename traits::const_pointer;
using value_type = typename traits::value_type;
zero_after_free_allocator() noexcept {}
zero_after_free_allocator(const zero_after_free_allocator& a) noexcept : base(a) {}
template <typename U>
zero_after_free_allocator(const zero_after_free_allocator<U>& a) noexcept : base(a)
{
}
~zero_after_free_allocator() noexcept {}
template <typename _Other>
struct rebind {
typedef zero_after_free_allocator<_Other> other;
};
void deallocate(T* p, std::size_t n)
{
if (p != nullptr)
memory_cleanse(p, sizeof(T) * n);
std::allocator<T>::deallocate(p, n);
}
};
/** Byte-vector that clears its contents before deletion. */
using SerializeData = std::vector<std::byte, zero_after_free_allocator<std::byte>>;
#endif // BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
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