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- API pages for dump, number_format, and operator<< of basic_json_view, linked both ways with the basic_json pages - the feature page describes document order and number_format::source - the examples show when the view helps: forwarding part of a message and writing numbers exactly as they were read Signed-off-by: Niels Lohmann <mail@nlohmann.me>
26 lines
1.0 KiB
C++
26 lines
1.0 KiB
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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using json_view = nlohmann::json_view;
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int main()
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{
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// a large batch of sensor readings -- forward just the one that changed,
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// without ever building a basic_json value for the batch or for the
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// readings that are not needed
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const json_document batch = json_document::parse(R"(
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[{"id": 1, "temp": 21.5}, {"id": 2, "temp": 87.3}, {"id": 3, "temp": 21.7}]
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)");
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const json_view readings = batch.root();
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std::cout << readings[1].dump() << '\n';
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// a configuration file -- dump() on the view keeps the member order of
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// the source text; a json value's object_t is std::map, so
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// materialize().dump() of the very same view sorts the keys instead
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const json_document config = json_document::parse(
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R"({"name": "cache", "host": "db1", "port": 6379, "timeout": 30})");
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std::cout << config.root().dump(2) << "\n\n";
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std::cout << config.root().materialize().dump(2) << '\n';
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}
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