mirror of
https://github.com/nlohmann/json.git
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Niels Lohmann
6fc0d501f3
* Add JSON_NO_UDLS to leave out the user-defined string literals The bodies of operator""_json and operator""_json_pointer call the parser, so every translation unit including the library instantiates it, even if it never parses anything. Defining JSON_NO_UDLS leaves the literals out entirely, which saves 15-35% compile time for such translation units (#5294). Nothing changes if the macro is not defined. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Mention JSON_NO_UDLS in the list of exported module symbols Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Move the user-defined string literals to <nlohmann/json_literals.hpp> Following the review in #5294, the literals now live in their own header instead of being removed entirely: <nlohmann/json.hpp> includes it at the end unless JSON_NO_AUTOMATIC_UDLS (renamed from JSON_NO_UDLS) is defined, so a project can opt out globally and include the header only where the literals are used. The header only uses public and standard macros, because the library's internal macros are undefined at the end of json.hpp and the amalgamation inlines macro_scope.hpp only once. For the same reason, the library no longer defines and undefines JSON_USE_GLOBAL_UDLS, so a user's definition is still visible to the header. The single-header copy is identical to the multi-header one, as it only includes <nlohmann/json.hpp>. The module always exports the literals. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Fix CI: include cycle, GCC 4.8 literal operator spacing, and global UDLs off in the JSON_NO_AUTOMATIC_UDLS test - Suppress clang-tidy misc-header-include-cycle on the intentional mutual include of json.hpp and json_literals.hpp. - Use operator"" _json with a space for GCC 4.8 in the test's detection aliases, as the header does. - Only test the global literal operators when JSON_USE_GLOBAL_UDLS is on. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Declare the literal operators through a local macro The GCC 4.8 spacing condition was repeated for both operator definitions and the global using-declarations. NLOHMANN_JSON_LITERAL_OPERATOR(suffix) now selects operator""##suffix or operator"" suffix in one place and is undefined at the end of json_literals.hpp. Suggested by gregmarr in review. Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
54 lines
1.9 KiB
C++
54 lines
1.9 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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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::json;
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using NLOHMANN_JSON_NAMESPACE::json_pointer;
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using NLOHMANN_JSON_NAMESPACE::ordered_json;
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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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