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// Copyright (c) 2009-2010 Satoshi Nakamoto
// Copyright (c) 2009-2022 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 {
using value_type = T;
zero_after_free_allocator() noexcept = default;
template <typename U>
zero_after_free_allocator(const zero_after_free_allocator<U>&) noexcept
{
}
T* allocate(std::size_t n)
{
return std::allocator<T>{}.allocate(n);
}
void deallocate(T* p, std::size_t n)
{
if (p != nullptr)
memory_cleanse(p, sizeof(T) * n);
std::allocator<T>{}.deallocate(p, n);
}
template <typename U>
friend bool operator==(const zero_after_free_allocator&, const zero_after_free_allocator<U>&) noexcept
{
return true;
}
template <typename U>
friend bool operator!=(const zero_after_free_allocator&, const zero_after_free_allocator<U>&) noexcept
{
return false;
}
};
/** 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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