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>
77 lines
1.9 KiB
C++
77 lines
1.9 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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class visitor_adaptor_with_metadata
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{
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public:
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template <class Fnc>
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void visit(const Fnc& fnc) const;
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int metadata = 42;
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private:
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template <class Ptr, class Fnc>
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void do_visit(const Ptr& ptr, const Fnc& fnc) const;
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};
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using json = nlohmann::json::with_base_class_t<visitor_adaptor_with_metadata>;
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template <class Fnc>
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void visitor_adaptor_with_metadata::visit(const Fnc& fnc) const
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{
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do_visit(json::json_pointer{}, fnc);
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}
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template <class Ptr, class Fnc>
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void visitor_adaptor_with_metadata::do_visit(const Ptr& ptr, const Fnc& fnc) const
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{
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using nlohmann::detail::value_t;
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const json& j = *static_cast<const json*>(this);
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switch (j.type())
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{
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case value_t::object:
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fnc(ptr, j);
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for (const auto& entry : j.items())
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{
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entry.value().do_visit(ptr / entry.key(), fnc);
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}
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break;
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case value_t::array:
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fnc(ptr, j);
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for (std::size_t i = 0; i < j.size(); ++i)
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{
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j.at(i).do_visit(ptr / std::to_string(i), fnc);
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}
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break;
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case value_t::null:
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case value_t::string:
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case value_t::boolean:
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case value_t::number_integer:
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case value_t::number_unsigned:
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case value_t::number_float:
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case value_t::binary:
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fnc(ptr, j);
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break;
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case value_t::discarded:
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default:
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break;
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}
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}
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int main()
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{
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// create a json object
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json j;
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j["null"];
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j["object"]["uint"] = 1U;
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j["object"].metadata = 21;
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// visit and output
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j.visit(
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[&](const json::json_pointer & p,
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const json & j)
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{
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std::cout << (p.empty() ? std::string{"/"} : p.to_string())
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<< " - metadata = " << j.metadata << " -> " << j.dump() << '\n';
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});
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}
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