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Niels Lohmann
52 lines
1.8 KiB
C++
52 lines
1.8 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 <type_traits> // conditional, is_same
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#include <nlohmann/detail/abi_macros.hpp>
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NLOHMANN_JSON_NAMESPACE_BEGIN
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/*!
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@brief Default base class of the @ref basic_json class.
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So that the correct implementations of the copy / move ctors / assign operators
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of @ref basic_json do not require complex case distinctions
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(no base class / custom base class used as customization point),
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@ref basic_json always has a base class.
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By default, this class is used because it is empty and thus has no effect
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on the behavior of @ref basic_json.
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@note This class intentionally lives in namespace @ref nlohmann rather than
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@ref nlohmann::detail. Every @ref basic_json specialization derives from
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it (via @ref detail::json_base_class) unless a custom base class is
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supplied, which makes its namespace an associated namespace of
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@ref basic_json for the purpose of argument-dependent lookup (ADL). If
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it lived in `nlohmann::detail`, that namespace - and with it the
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library's internal `to_json`/`from_json` overloads - would leak into
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ADL for any unqualified `to_json`/`from_json` call a user makes
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involving a @ref basic_json argument, silently shadowing the user's own
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overloads in some cases.
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*/
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struct json_default_base {};
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namespace detail
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{
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template<class T>
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using json_base_class = typename std::conditional <
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std::is_same<T, void>::value,
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::nlohmann::json_default_base,
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T
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>::type;
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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