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Niels Lohmann
08dcdaf9b8
- API pages for operator[], at, front, back, find, contains, count, begin, end, cbegin, cend, items, and type_name of basic_json_view, linked both ways with the basic_json pages - the feature page and size() describe document order and duplicate keys - the examples show when the view helps: reading a few fields of a large text, probing optional members, and members in source order Signed-off-by: Niels Lohmann <mail@nlohmann.me>
23 lines
932 B
C++
23 lines
932 B
C++
#include <iostream>
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#include <nlohmann/json_view.hpp>
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using json_document = nlohmann::json_document;
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int main()
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{
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// a settings object whose source text records every update to a key as
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// a duplicate member. items() visits all of them, in document order, so
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// the update history is visible; operator[] only ever sees the first
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// one, and materialize() -- like basic_json::parse() -- keeps the last
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json_document updates = json_document::parse(R"({"retries": 1, "timeout": 30, "retries": 5})");
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const auto settings = updates.root();
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for (const auto& item : settings.items())
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{
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std::cout << item.key() << '=' << item.value().materialize().dump() << '\n';
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}
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std::cout << "first \"retries\" seen by operator[]: " << settings["retries"].materialize().dump() << '\n';
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std::cout << "last \"retries\" kept by materialize(): " << settings.materialize()["retries"].dump() << '\n';
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}
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