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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>
34 lines
1.0 KiB
C++
34 lines
1.0 KiB
C++
#include <iostream>
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#include <string>
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#include <nlohmann/json.hpp>
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#include <nlohmann/json_view.hpp>
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using nlohmann::json_document;
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int main()
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{
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std::cout << std::boolalpha;
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// an lvalue std::string is BORROWED: the document only stores a pointer
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// into `text`, so `text` must outlive `borrowed`
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std::string text = R"({"count": 3})";
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json_document borrowed = json_document::parse(text);
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std::cout << borrowed.owns_source() << '\n'; // false
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// an rvalue std::string is MOVED into the document -- no copy of the text
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json_document owned = json_document::parse(std::string(R"({"count": 3})"));
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std::cout << owned.owns_source() << '\n'; // true
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// errors are identical to basic_json::parse: same exception id, message,
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// and position, because the library parser runs on the same bytes on a
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// failing input
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try
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{
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static_cast<void>(json_document::parse(R"({"count": )"));
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}
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catch (const nlohmann::json::parse_error& e)
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{
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std::cout << e.id << '\n';
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}
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}
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