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>
32 lines
1.3 KiB
C++
32 lines
1.3 KiB
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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#include <string>
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using nlohmann::json_document;
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using nlohmann::json_view;
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int main()
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{
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// a "large response" stand-in: only the "id" field is ever read out of it
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const std::string text =
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R"({"id": "8f14e45f-ceea-467e-bb92-963f5e3c7a08", "note": "created via API\n", "payload": "..."})";
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const json_document doc = json_document::parse(text);
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const json_view response = doc.root();
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const json_view::string_view_t id = response["id"].get_string();
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std::cout << id << '\n';
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// no std::string was allocated for "id": its bytes still live inside
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// the original buffer, so id's data lies inside [text.data(),
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// text.data() + text.size())
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const bool id_in_source = id.data() >= text.data() && id.data() + id.size() <= text.data() + text.size();
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std::cout << std::boolalpha << id_in_source << '\n';
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// "note" contains an escape sequence ('\n'), so it was decoded once
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// into the document's own buffer -- get_string() still avoids a copy
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// into a new std::string, but the bytes no longer live inside "text"
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const json_view::string_view_t note = response["note"].get_string();
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const bool note_in_source = note.data() >= text.data() && note.data() + note.size() <= text.data() + text.size();
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std::cout << std::boolalpha << note_in_source << '\n';
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}
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