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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>
37 lines
1011 B
C++
37 lines
1011 B
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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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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// required fields of a service configuration -- at() reports a missing
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// or wrong-typed field with the very same exception basic_json::at()
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// would throw for the equivalent nlohmann::json value, so error
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// handling written against basic_json::at() keeps working unchanged
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json_document config = json_document::parse(R"({"name": "cache", "port": "6379"})");
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const json_view service = config.root();
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std::cout << service.at("port").materialize().dump() << '\n';
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try
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{
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// "port" is a string, not an array
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static_cast<void>(service.at("port").at(0));
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}
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catch (const nlohmann::json::type_error& e)
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{
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std::cout << e.what() << '\n';
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}
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try
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{
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static_cast<void>(service.at("timeout"));
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}
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catch (const nlohmann::json::out_of_range& e)
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{
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std::cout << e.what() << '\n';
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}
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}
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