mirror of
https://github.com/nlohmann/json.git
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Niels Lohmann
759dd2e1b1
Add json_document and json_view, a read-only, zero-copy index of a JSON text, as the first public slice of the zero-copy view (#5295). A parse produces a flat array of 16-byte nodes in document order, one per value and one per object key. Strings stay in the source text; escaped strings are decoded into an arena. Integers are converted while their digits are in the cache; floats keep only their digit layout and are converted on read. Containers store the size of their subtree, so a reader can step over one in constant time. A document makes a handful of allocations, however many values it has. The parser accepts exactly what json::parse accepts, with every combination of ignore_comments and ignore_trailing_commas, with and without a trailing NUL, and under JSON_STRICT_NUL_HANDLING. It is portable C++11 and does not depend on byte order. basic_json_document adds parse, parse_copy, accept, read (reuses a document's memory), root, is_discarded, source, owns_source, node_count, memory_usage, and shrink_to_fit. basic_json_view adds type, the is_* queries, operator bool, size, empty, materialize, and source_offset. A parse error throws the same exception basic_json::parse would throw for the same input, message and position included. detail::abi_config keeps JSON_STRICT_NUL_HANDLING and JSON_USE_LEGACY_DISCARDED_VALUE_COMPARISON readable after json.hpp undefines them, in the ABI namespace so they always match the basic_json in use. A NUL byte that ends a // comment is the end of the input, as in parse() since #5696. Signed-off-by: Niels Lohmann <mail@nlohmann.me>
61 lines
2.2 KiB
C++
61 lines
2.2 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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module;
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// GCC workaround for C++ modules support.
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// When using C++20 modules, some compilers (particularly GCC) may have issues
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// with template instantiations in the module preamble. If you encounter
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// "redefinition" errors when including nlohmann/json.hpp, try one of:
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// 1. Include nlohmann/json.hpp in your module preamble BEFORE other #includes
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// 2. Or use: import nlohmann.json; instead of #include <nlohmann/json.hpp>
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// 3. Or upgrade to a newer GCC version with better modules support.
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// See: https://github.com/nlohmann/json/issues/5103
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#include <nlohmann/json.hpp>
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#include <nlohmann/json_literals.hpp>
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#include <nlohmann/json_view.hpp>
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export module nlohmann.json;
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export
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NLOHMANN_JSON_NAMESPACE_BEGIN
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using NLOHMANN_JSON_NAMESPACE::adl_serializer;
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using NLOHMANN_JSON_NAMESPACE::basic_json;
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using NLOHMANN_JSON_NAMESPACE::basic_json_document;
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using NLOHMANN_JSON_NAMESPACE::basic_json_view;
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using NLOHMANN_JSON_NAMESPACE::json;
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using NLOHMANN_JSON_NAMESPACE::json_document;
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using NLOHMANN_JSON_NAMESPACE::json_pointer;
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using NLOHMANN_JSON_NAMESPACE::json_view;
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using NLOHMANN_JSON_NAMESPACE::ordered_json;
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using NLOHMANN_JSON_NAMESPACE::ordered_json_document;
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using NLOHMANN_JSON_NAMESPACE::ordered_json_view;
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using NLOHMANN_JSON_NAMESPACE::ordered_map;
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using NLOHMANN_JSON_NAMESPACE::to_string;
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inline namespace literals
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{
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inline namespace json_literals
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{
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using NLOHMANN_JSON_NAMESPACE::literals::json_literals::operator""_json;
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using NLOHMANN_JSON_NAMESPACE::literals::json_literals::operator""_json_pointer;
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} // namespace json_literals
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} // namespace literals
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// Note: the following nlohmann::detail symbols must be exported due to
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// an MSVC bug failing to compile without these symbols visible (ticket #3970)
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namespace detail
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{
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using NLOHMANN_JSON_NAMESPACE::detail::json_sax_dom_callback_parser;
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using NLOHMANN_JSON_NAMESPACE::detail::unknown_size;
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} // namespace detail
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NLOHMANN_JSON_NAMESPACE_END
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