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ea4b61a157
Includes allocator::pointer, allocator::const_pointer, allocator::reference and allocator::const_reference which are deprecated in c++17 and removed in c++20. See https://en.cppreference.com/w/cpp/memory/allocator Also prefer `using` over `typedef` see: https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines#Rt-using
46 lines
1.6 KiB
C++
46 lines
1.6 KiB
C++
// Copyright (c) 2009-2010 Satoshi Nakamoto
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// Copyright (c) 2009-2018 The Bitcoin Core developers
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// Distributed under the MIT software license, see the accompanying
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// file COPYING or http://www.opensource.org/licenses/mit-license.php.
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#ifndef BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
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#define BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
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#include <support/cleanse.h>
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#include <memory>
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#include <vector>
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template <typename T>
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struct zero_after_free_allocator : public std::allocator<T> {
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using base = std::allocator<T>;
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using traits = std::allocator_traits<base>;
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using size_type = typename traits::size_type;
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using difference_type = typename traits::difference_type;
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using pointer = typename traits::pointer;
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using const_pointer = typename traits::const_pointer;
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using value_type = typename traits::value_type;
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zero_after_free_allocator() noexcept {}
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zero_after_free_allocator(const zero_after_free_allocator& a) noexcept : base(a) {}
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template <typename U>
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zero_after_free_allocator(const zero_after_free_allocator<U>& a) noexcept : base(a)
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{
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}
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~zero_after_free_allocator() noexcept {}
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template <typename _Other>
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struct rebind {
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typedef zero_after_free_allocator<_Other> other;
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};
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void deallocate(T* p, std::size_t n)
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{
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if (p != nullptr)
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memory_cleanse(p, sizeof(T) * n);
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std::allocator<T>::deallocate(p, n);
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}
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};
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/** Byte-vector that clears its contents before deletion. */
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using SerializeData = std::vector<uint8_t, zero_after_free_allocator<uint8_t>>;
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#endif // BITCOIN_SUPPORT_ALLOCATORS_ZEROAFTERFREE_H
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