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https://github.com/nlohmann/json.git
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Niels Lohmann
330fbead59
* Document clang-tidy exclusions and drop unneeded ones Re-enable every excluded check in a run of clang-tidy 22 over all tests and remove the seven that never fire (cert-err58-cpp, clang-analyzer-webkit.NoUncountedMemberChecker, cppcoreguidelines-virtual-class-destructor, google-readability-function-size, hicpp-function-size, hicpp-no-assembler, readability-function-size). Document the reason for every remaining exclusion at the top of the file. Exclude in advance the checks that only exist in clang-tidy 23 and are noise here (bugprone-signed-bitwise, *-explicit-constructor, readability-trailing-comma, modernize-use-string-view), plus modernize-use-integer-sign-comparison, which needs C++20 std::cmp_less and flags deliberate casts. Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Fix clang-tidy findings in documentation examples and replace redundant aliases Apply clang-tidy fixes to the documentation examples: - performance-avoid-endl: std::endl -> '\n' - readability-qualified-auto: auto -> auto* / const auto* - performance-for-range-copy: copy -> const reference - google-readability-casting: C-style cast -> static_cast Replace redundant aliases (readability-redundant-qualified-alias) such as "using json = nlohmann::json;" with "using nlohmann::json;" in the documentation, README, examples, tests, and benchmarks. Aliases at class scope and aliases of other types (with_base_class_t etc.) are kept. No changes to the library or its public API. All changed examples were compiled and run; their output matches the stored .output files (except max_size and meta, which depend on the platform and compiler). Signed-off-by: Niels Lohmann <mail@nlohmann.me> * Format doc examples with the pinned astyle Signed-off-by: Niels Lohmann <mail@nlohmann.me> --------- Signed-off-by: Niels Lohmann <mail@nlohmann.me>
48 lines
1.6 KiB
C++
48 lines
1.6 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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int main()
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{
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// a JSON text with an array and a number inside an object
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const auto* text = R"({"IDs": [116, 943], "Width": 800})";
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// discard the array when the parser reads its opening bracket
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json j_array_start = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
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{
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return event != json::parse_event_t::array_start;
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});
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// discard the same array when the parser reads its closing bracket
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json j_array_end = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
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{
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return event != json::parse_event_t::array_end;
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});
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// discard the number, but keep its key
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json j_value = json::parse(text, [](int /*depth*/, json::parse_event_t event, json & parsed)
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{
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return !(event == json::parse_event_t::value && parsed == json(800));
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});
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// discard the key of the number
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json j_key = json::parse(text, [](int /*depth*/, json::parse_event_t event, json & parsed)
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{
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return !(event == json::parse_event_t::key && parsed == json("Width"));
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});
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// discard the top-level object
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json j_root = json::parse(text, [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
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{
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return event != json::parse_event_t::object_end;
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});
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// in every case, the discarded value is removed together with its key
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std::cout << j_array_start << '\n'
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<< j_array_end << '\n'
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<< j_value << '\n'
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<< j_key << '\n'
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<< j_root << '\n';
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}
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