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>
30 lines
1.2 KiB
C++
30 lines
1.2 KiB
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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// a price and an order id from an incoming order -- both need to be
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// reproduced exactly, e.g. for an invoice or an audit log
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json_document doc = json_document::parse(R"(
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{"price": 19.90, "order_id": 1234567890123456789012345, "quantity": 3}
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)");
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const json_view order = doc.root();
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// number_token() returns the number exactly as written in the source
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std::cout << order["price"].number_token() << '\n';
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std::cout << order["order_id"].number_token() << '\n';
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// get<double>() converts it instead -- the exact source text is gone:
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// "19.90" becomes the double closest to 19.9, printed without the
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// trailing zero, and the 25-digit order id -- far beyond any 64-bit
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// integer -- can only be approximated as a double
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std::cout << order["price"].get<double>() << '\n';
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std::cout << order.materialize()["order_id"].dump() << '\n';
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// an ordinary quantity has nothing to lose either way
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std::cout << order["quantity"].number_token() << " == " << order["quantity"].get<int>() << '\n';
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}
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