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43e2d9c525
- API pages for get, get_to, get_string, number_token, and value of basic_json_view; JSON pointer overloads of operator[], at, and contains; links both ways with the basic_json pages - the feature page describes which conversions copy nothing - the examples show when the view helps: strings without copies, numbers exactly as written, and paths into a large text Signed-off-by: Niels Lohmann <mail@nlohmann.me>
29 lines
962 B
C++
29 lines
962 B
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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#include <string>
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using json_document = nlohmann::json_document;
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using json_view = nlohmann::json_view;
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int main()
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{
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json_document doc = json_document::parse(R"({"host": "db.example.com", "port": 5432, "ssl": true})");
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const json_view config = doc.root();
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// get_to() writes directly into existing variables -- handy for filling
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// in the members of a struct one field at a time, without an
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// intermediate value from get<T>() for each one
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std::string host;
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int port = 0;
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bool ssl = false;
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config["host"].get_to(host);
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config["port"].get_to(port);
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config["ssl"].get_to(ssl);
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std::cout << host << ':' << port << (ssl ? " (tls)" : "") << '\n';
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// the return value is a reference to the argument, so a call can be
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// used directly in a larger expression
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std::string other_host;
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std::cout << config["host"].get_to(other_host).size() << '\n';
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}
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