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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>
39 lines
1.4 KiB
C++
39 lines
1.4 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 deployment plan -- "budget" is written with a trailing zero that has
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// no effect on its value
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const std::string text = R"({
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"release": "2026.09",
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"steps": ["build", "test", "deploy"],
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"budget": 19.90
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})";
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json_editable_document doc = json_editable_document::parse(text);
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const std::size_t deploy_index = 2;
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const auto deploy = doc.root()["steps"][deploy_index]; // held across the insert
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doc.insert(doc.root()["steps"], deploy_index, "smoke-test"); // insert before "deploy"
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// the held view still refers to "deploy", even though its index moved
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// from 2 to 3, and nothing else in the document was touched
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std::cout << deploy.dump() << '\n';
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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 edit on a plain json value: an index held from before the
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// insert now refers to whatever moved into that slot, and dump()
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// rewrites "budget" to its shortest form even though it was never
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// touched
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json plain = json::parse(text);
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plain["steps"].insert(plain["steps"].begin() + static_cast<std::ptrdiff_t>(deploy_index), "smoke-test");
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std::cout << plain["steps"][deploy_index].dump() << '\n';
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std::cout << plain.dump(2) << '\n';
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}
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