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>
56 lines
1.6 KiB
C++
56 lines
1.6 KiB
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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#include <string>
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#include <vector>
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using nlohmann::json_document;
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using nlohmann::json_view;
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// address has no direct conversion in get<T>(), so get<address>() falls back
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// to materialize().get<address>() -- a real nlohmann::json value is built
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// for just this one member, and its own from_json() runs on that
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struct address
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{
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std::string city;
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int zip = 0;
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};
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void from_json(const nlohmann::json& j, address& a)
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{
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j.at("city").get_to(a.city);
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j.at("zip").get_to(a.zip);
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}
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int main()
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{
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json_document doc = json_document::parse(R"(
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{
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"name": "Alice",
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"active": true,
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"orders": [1, 2, 3],
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"address": {"city": "Berlin", "zip": 10115}
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}
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)");
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const json_view customer = doc.root();
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// read typed fields straight into C++ variables -- none of these build
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// a nlohmann::json value
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const std::string name = customer["name"].get<std::string>();
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const bool active = customer["active"].get<bool>();
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std::cout << name << (active ? " (active)" : " (inactive)") << '\n';
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// std::vector<json_view> keeps views of the array elements instead of
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// copies of their values
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bool first = true;
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for (const json_view order : customer["orders"].get<std::vector<json_view>>())
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{
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std::cout << (first ? "" : " ") << order.get<int>();
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first = false;
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}
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std::cout << '\n';
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// everything else goes through materialize()
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const address a = customer["address"].get<address>();
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std::cout << a.city << ' ' << a.zip << '\n';
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}
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