mirror of
https://github.com/nlohmann/json
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0258484626
- updated documentation wrt. new repository layout - temporarily switched off Homebrew --HEAD building (can only be switched on after release) - set copyright date to 2018
49 lines
1.3 KiB
C++
49 lines
1.3 KiB
C++
#include <iostream>
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#include <nlohmann/json.hpp>
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using json = nlohmann::json;
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int main()
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{
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// create a JSON value
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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["/number"_json_pointer] << '\n';
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// output element with JSON pointer "/string"
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std::cout << j["/string"_json_pointer] << '\n';
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// output element with JSON pointer "/array"
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std::cout << j["/array"_json_pointer] << '\n';
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// output element with JSON pointer "/array/1"
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std::cout << j["/array/1"_json_pointer] << '\n';
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// writing access
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// change the string
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j["/string"_json_pointer] = "bar";
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// output the changed string
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std::cout << j["string"] << '\n';
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// "change" a nonexisting object entry
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j["/boolean"_json_pointer] = true;
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// output the changed object
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std::cout << j << '\n';
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// change an array element
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j["/array/1"_json_pointer] = 21;
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// "change" an array element with nonexisting index
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j["/array/4"_json_pointer] = 44;
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// output the changed array
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std::cout << j["array"] << '\n';
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// "change" the array element past the end
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j["/array/-"_json_pointer] = 55;
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// output the changed array
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std::cout << j["array"] << '\n';
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}
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