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Niels Lohmann
0050d0f7a4
Copying and comparing stopped their descent at basic_json::nesting_depth_limit(), while serializing, hashing and merging used detail::recursion_depth_limit(). Both were 128, but nothing kept them equal. The thread-local count now tests against detail::recursion_depth_limit() as well, and a static_assert keeps the limit small enough for the byte that holds the count. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
42 lines
1.2 KiB
C++
42 lines
1.2 KiB
C++
// __ _____ _____ _____
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// __| | __| | | | JSON for Modern C++
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// | | |__ | | | | | | version 3.12.0
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// |_____|_____|_____|_|___| https://github.com/nlohmann/json
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//
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// SPDX-FileCopyrightText: 2013-2026 Niels Lohmann <https://nlohmann.me>
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// SPDX-License-Identifier: MIT
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#pragma once
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#include <cstddef> // size_t
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#include <nlohmann/detail/abi_macros.hpp>
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NLOHMANN_JSON_NAMESPACE_BEGIN
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namespace detail
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{
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/*!
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@brief the number of nesting levels an operation recurses into
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Operations that walk a value (copying, comparing, serializing, hashing, merging,
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...) recurse once
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per nesting level, which is fastest, but a value nested deeply enough would
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exhaust the call stack. So they recurse only this many levels deep and finish
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whatever lies below with an explicit stack. All of them share this limit.
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Most of them pass the depth down as an argument. The copy constructor and the
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comparison operators cannot, as their signatures are fixed, so they count it
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in basic_json::nesting_depth() instead, a byte per thread; the limit must
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therefore stay below 255.
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@sa https://github.com/nlohmann/json/issues/5387
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*/
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constexpr std::size_t recursion_depth_limit() noexcept
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{
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return 128;
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}
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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