mirror of
https://github.com/nlohmann/json.git
synced 2026-10-03 21:20:30 +00:00
Niels LohmannandMuhammad Amir bin Mohamad Ghazaly
d914e3a027
Maps with enum keys, such as std::map<E, T>, are stored as arrays of [key, value] pairs, because enums are not convertible to the string type of object keys - even if NLOHMANN_JSON_SERIALIZE_ENUM maps them to strings (#4378). The new JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS macro stores them as objects instead, converting each key with the enum's to_json. It applies to any map-like type with enum keys (std::map with any comparator, std::unordered_map, ...). A key that does not convert to a string throws type_error.302, and two keys converting to the same string throw the new type_error.318, rather than losing an entry. The macro changes the output of inline functions, so it is part of the ABI tag (_ekmo). Reading needs no macro: std::map and std::unordered_map with enum keys are now also read from objects, converting each key with the enum's from_json. That input was rejected before, and arrays of pairs are still read, so data written either way can be read. This supersedes #4531, which first proposed storing these maps as objects. Co-authored-by: Muhammad Amir bin Mohamad Ghazaly <amirghaz@umich.edu> Signed-off-by: Niels Lohmann <mail@nlohmann.me>
156 lines
5.4 KiB
C++
156 lines
5.4 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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// This file contains all macro definitions affecting or depending on the ABI
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#ifndef JSON_SKIP_LIBRARY_VERSION_CHECK
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#if defined(NLOHMANN_JSON_VERSION_MAJOR) && defined(NLOHMANN_JSON_VERSION_MINOR) && defined(NLOHMANN_JSON_VERSION_PATCH)
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#if NLOHMANN_JSON_VERSION_MAJOR != 3 || NLOHMANN_JSON_VERSION_MINOR != 12 || NLOHMANN_JSON_VERSION_PATCH != 0
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#warning "Already included a different version of the library!"
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#endif
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#endif
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#endif
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#define NLOHMANN_JSON_VERSION_MAJOR 3 // NOLINT(modernize-macro-to-enum)
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#define NLOHMANN_JSON_VERSION_MINOR 12 // NOLINT(modernize-macro-to-enum)
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#define NLOHMANN_JSON_VERSION_PATCH 0 // NOLINT(modernize-macro-to-enum)
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#ifndef JSON_DIAGNOSTICS
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#define JSON_DIAGNOSTICS 0
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#endif
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#ifndef JSON_DIAGNOSTIC_POSITIONS
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#define JSON_DIAGNOSTIC_POSITIONS 0
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#endif
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#ifndef JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
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#define JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON 0
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#endif
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#ifndef JSON_BRACE_INIT_COPY_SEMANTICS
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#define JSON_BRACE_INIT_COPY_SEMANTICS 0
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#endif
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#ifndef JSON_PRECISE_STREAM_POSITION
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#define JSON_PRECISE_STREAM_POSITION 0
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#endif
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#ifndef JSON_STRICT_NUL_HANDLING
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#define JSON_STRICT_NUL_HANDLING 0
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#endif
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#ifndef JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS
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#define JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS 0
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#endif
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#if JSON_DIAGNOSTICS
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#define NLOHMANN_JSON_ABI_TAG_DIAGNOSTICS _diag
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#else
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#define NLOHMANN_JSON_ABI_TAG_DIAGNOSTICS
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#endif
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#if JSON_DIAGNOSTIC_POSITIONS
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#define NLOHMANN_JSON_ABI_TAG_DIAGNOSTIC_POSITIONS _dp
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#else
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#define NLOHMANN_JSON_ABI_TAG_DIAGNOSTIC_POSITIONS
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#endif
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#if JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON
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#define NLOHMANN_JSON_ABI_TAG_LEGACY_DISCARDED_VALUE_COMPARISON _ldvcmp
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#else
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#define NLOHMANN_JSON_ABI_TAG_LEGACY_DISCARDED_VALUE_COMPARISON
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#endif
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#if JSON_BRACE_INIT_COPY_SEMANTICS
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#define NLOHMANN_JSON_ABI_TAG_BRACE_INIT_COPY_SEMANTICS _bics
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#else
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#define NLOHMANN_JSON_ABI_TAG_BRACE_INIT_COPY_SEMANTICS
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#endif
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#if JSON_PRECISE_STREAM_POSITION
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#define NLOHMANN_JSON_ABI_TAG_PRECISE_STREAM_POSITION _psp
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#else
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#define NLOHMANN_JSON_ABI_TAG_PRECISE_STREAM_POSITION
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#endif
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#if JSON_STRICT_NUL_HANDLING
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#define NLOHMANN_JSON_ABI_TAG_STRICT_NUL_HANDLING _snul
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#else
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#define NLOHMANN_JSON_ABI_TAG_STRICT_NUL_HANDLING
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#endif
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#if JSON_USE_OBJECTS_FOR_ENUM_KEYED_MAPS
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#define NLOHMANN_JSON_ABI_TAG_OBJECTS_FOR_ENUM_KEYED_MAPS _ekmo
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#else
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#define NLOHMANN_JSON_ABI_TAG_OBJECTS_FOR_ENUM_KEYED_MAPS
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#endif
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#ifndef NLOHMANN_JSON_NAMESPACE_NO_VERSION
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#define NLOHMANN_JSON_NAMESPACE_NO_VERSION 0
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#endif
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// Construct the namespace ABI tags component
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#define NLOHMANN_JSON_ABI_TAGS_CONCAT_EX(a, b, c, d, e, f, g) json_abi ## a ## b ## c ## d ## e ## f ## g
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#define NLOHMANN_JSON_ABI_TAGS_CONCAT(a, b, c, d, e, f, g) \
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NLOHMANN_JSON_ABI_TAGS_CONCAT_EX(a, b, c, d, e, f, g)
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#define NLOHMANN_JSON_ABI_TAGS \
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NLOHMANN_JSON_ABI_TAGS_CONCAT( \
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NLOHMANN_JSON_ABI_TAG_DIAGNOSTICS, \
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NLOHMANN_JSON_ABI_TAG_LEGACY_DISCARDED_VALUE_COMPARISON, \
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NLOHMANN_JSON_ABI_TAG_DIAGNOSTIC_POSITIONS, \
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NLOHMANN_JSON_ABI_TAG_BRACE_INIT_COPY_SEMANTICS, \
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NLOHMANN_JSON_ABI_TAG_PRECISE_STREAM_POSITION, \
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NLOHMANN_JSON_ABI_TAG_STRICT_NUL_HANDLING, \
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NLOHMANN_JSON_ABI_TAG_OBJECTS_FOR_ENUM_KEYED_MAPS)
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// Construct the namespace version component
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#define NLOHMANN_JSON_NAMESPACE_VERSION_CONCAT_EX(major, minor, patch) \
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_v ## major ## _ ## minor ## _ ## patch
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#define NLOHMANN_JSON_NAMESPACE_VERSION_CONCAT(major, minor, patch) \
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NLOHMANN_JSON_NAMESPACE_VERSION_CONCAT_EX(major, minor, patch)
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#if NLOHMANN_JSON_NAMESPACE_NO_VERSION
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#define NLOHMANN_JSON_NAMESPACE_VERSION
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#else
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#define NLOHMANN_JSON_NAMESPACE_VERSION \
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NLOHMANN_JSON_NAMESPACE_VERSION_CONCAT(NLOHMANN_JSON_VERSION_MAJOR, \
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NLOHMANN_JSON_VERSION_MINOR, \
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NLOHMANN_JSON_VERSION_PATCH)
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#endif
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// Combine namespace components
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#define NLOHMANN_JSON_NAMESPACE_CONCAT_EX(a, b) a ## b
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#define NLOHMANN_JSON_NAMESPACE_CONCAT(a, b) \
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NLOHMANN_JSON_NAMESPACE_CONCAT_EX(a, b)
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#ifndef NLOHMANN_JSON_NAMESPACE
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#define NLOHMANN_JSON_NAMESPACE \
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nlohmann::NLOHMANN_JSON_NAMESPACE_CONCAT( \
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NLOHMANN_JSON_ABI_TAGS, \
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NLOHMANN_JSON_NAMESPACE_VERSION)
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#endif
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#ifndef NLOHMANN_JSON_NAMESPACE_BEGIN
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#define NLOHMANN_JSON_NAMESPACE_BEGIN \
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namespace nlohmann \
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{ \
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inline namespace NLOHMANN_JSON_NAMESPACE_CONCAT( \
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NLOHMANN_JSON_ABI_TAGS, \
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NLOHMANN_JSON_NAMESPACE_VERSION) \
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{
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#endif
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#ifndef NLOHMANN_JSON_NAMESPACE_END
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#define NLOHMANN_JSON_NAMESPACE_END \
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} /* namespace (inline namespace) NOLINT(readability/namespace) */ \
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} // namespace nlohmann
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#endif
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