mirror of
https://github.com/nlohmann/json.git
synced 2026-10-25 07:18:55 +00:00
Niels Lohmann
d93ea68633
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>
81 lines
1.9 KiB
C++
81 lines
1.9 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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using nlohmann::json;
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using namespace nlohmann::literals;
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int main()
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{
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// create a JSON value
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const json j =
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{
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{"number", 1}, {"string", "foo"}, {"array", {1, 2}}
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};
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// read-only access
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// output element with JSON pointer "/number"
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std::cout << j.at("/number"_json_pointer) << '\n';
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// output element with JSON pointer "/string"
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std::cout << j.at("/string"_json_pointer) << '\n';
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// output element with JSON pointer "/array"
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std::cout << j.at("/array"_json_pointer) << '\n';
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// output element with JSON pointer "/array/1"
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std::cout << j.at("/array/1"_json_pointer) << '\n';
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// out_of_range.109
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try
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{
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// try to use an array index that is not a number
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json::const_reference ref = j.at("/array/one"_json_pointer);
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}
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catch (const json::parse_error& e)
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{
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std::cout << e.what() << '\n';
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}
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// out_of_range.401
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try
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{
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// try to use an invalid array index
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json::const_reference ref = j.at("/array/4"_json_pointer);
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}
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catch (const 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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// out_of_range.402
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try
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{
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// try to use the array index '-'
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json::const_reference ref = j.at("/array/-"_json_pointer);
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}
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catch (const 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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// out_of_range.403
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try
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{
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// try to use a JSON pointer to a nonexistent object key
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json::const_reference ref = j.at("/foo"_json_pointer);
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}
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catch (const 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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// out_of_range.404
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try
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{
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// try to use a JSON pointer that cannot be resolved
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json::const_reference ref = j.at("/number/foo"_json_pointer);
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}
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catch (const 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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