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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>
42 lines
1.5 KiB
C++
42 lines
1.5 KiB
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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using nlohmann::json;
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using nlohmann::json_editable_document;
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using nlohmann::json_editable_view;
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int main()
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{
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// a configuration file, as it might be read from disk -- "price" is
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// written with a trailing zero that has no effect on its value
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const std::string text = R"({
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"name": "cache",
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"host": "db1",
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"port": 6379,
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"price": 19.90,
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"replicas": ["db2", "db3"],
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"timeout": 30
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})";
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json_editable_document doc = json_editable_document::parse(text);
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doc.set(doc.root()["port"], 6380); // (1) replace a value
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doc.set(doc.root(), "region", "us-east"); // (2) add a member
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doc.set(doc.root()["replicas"], 0, "db4"); // (3) assign an element
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doc.set(json::json_pointer("/timeout"), 45); // (4) via a JSON pointer
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// members stay in document order (the new one at the end), and a number
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// that was not itself edited keeps its exact spelling
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std::cout << doc.root().dump(2, ' ', false, json_editable_view::number_format::source) << "\n\n";
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// the same edits on a plain json value: object_t is a std::map, so
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// parsing already sorted the keys, and dump() rewrites every number to
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// its shortest form, even "price", which was never touched
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json plain = json::parse(text);
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plain["port"] = 6380;
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plain["region"] = "us-east";
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plain["replicas"][0] = "db4";
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plain[json::json_pointer("/timeout")] = 45;
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std::cout << plain.dump(2) << '\n';
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}
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