457572184c
In this commit, also the semantics for values skipped via the parser callback has changed. Now, the top-level value is returned as “null” instead of “discarded”.
47 lines
1.1 KiB
C++
47 lines
1.1 KiB
C++
#include <json.hpp>
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using namespace nlohmann;
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int main()
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{
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// a JSON text
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std::string text = R"(
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{
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"Image": {
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"Width": 800,
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"Height": 600,
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"Title": "View from 15th Floor",
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"Thumbnail": {
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"Url": "http://www.example.com/image/481989943",
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"Height": 125,
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"Width": 100
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},
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"Animated" : false,
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"IDs": [116, 943, 234, 38793]
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}
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}
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)";
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// parse and serialize JSON
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json j_complete = json::parse(text);
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std::cout << std::setw(4) << j_complete << "\n\n";
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// define parser callback
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json::parser_callback_t cb = [](int depth, json::parse_event_t event, json & parsed)
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{
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// skip object elements with key "Thumbnail"
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if (event == json::parse_event_t::key and parsed == json("Thumbnail"))
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{
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return false;
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}
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else
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{
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return true;
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}
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};
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// parse (with callback) and serialize JSON
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json j_filtered = json::parse(text, cb);
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std::cout << std::setw(4) << j_filtered << '\n';
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} |