mirror of
https://github.com/simdjson/simdjson
synced 2026-06-08 17:27:07 +00:00
Francisco Geiman Thiesen
96 lines
3.9 KiB
C++
96 lines
3.9 KiB
C++
#include <iostream>
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#include <iomanip>
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#include "simdjson.h"
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#include <cpr/cpr.h>
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struct GitHubUser {
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std::string login;
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std::optional<std::string> name;
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std::optional<std::string> company;
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std::optional<std::string> blog;
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std::optional<std::string> location;
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std::optional<std::string> email;
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std::optional<std::string> bio;
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int64_t public_repos;
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int64_t followers;
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int64_t following;
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};
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int main() {
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std::cout << "🔄 C++26 Reflection: Complete JSON Round-Trip Demo\n";
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std::cout << "================================================\n\n";
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// Step 1: Fetch real data from GitHub
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std::cout << "📡 Fetching GitHub user data...\n";
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auto response = cpr::Get(cpr::Url{"https://api.github.com/users/simdjson"});
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if (response.status_code != 200) {
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std::cerr << "Error: Failed to fetch data\n";
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return 1;
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}
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std::cout << "✅ Received " << response.text.length() << " bytes of JSON\n\n";
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// Step 2: Deserialize with ONE LINE
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std::cout << "📥 DESERIALIZATION (JSON → Struct)\n";
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std::cout << "Code: GitHubUser user = simdjson::from(simdjson::padded_string(response.text));\n\n";
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GitHubUser user = simdjson::from(simdjson::padded_string(response.text));
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// Show the data we parsed
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std::cout << "Parsed data:\n";
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std::cout << " • Login: " << user.login << "\n";
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std::cout << " • Name: " << (user.name.has_value() ? *user.name : "<not set>") << "\n";
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std::cout << " • Company: " << (user.company.has_value() ? *user.company : "<not set>") << "\n";
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std::cout << " • Location: " << (user.location.has_value() ? *user.location : "<not set>") << "\n";
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std::cout << " • Bio: " << (user.bio.has_value() ? *user.bio : "<not set>") << "\n";
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std::cout << " • Repos: " << user.public_repos << "\n";
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std::cout << " • Followers: " << user.followers << "\n\n";
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// Step 3: Modify the data
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std::cout << "✏️ Modifying data...\n";
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user.followers += 1000; // Wishful thinking!
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user.name = "simdjson - JSON at the speed of light"; // Set a name
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user.bio = user.bio.value_or("") + " (Now with C++26 reflection!)";
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std::cout << " • Added 1000 followers (we can dream!)\n";
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std::cout << " • Set organization name\n";
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std::cout << " • Updated bio\n\n";
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// Step 4: Serialize back to JSON with ONE LINE
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std::cout << "📤 SERIALIZATION (Struct → JSON)\n";
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std::cout << "Code: std::string json = simdjson::builder::to_json_string(user);\n\n";
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auto json_result = simdjson::builder::to_json_string(user);
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if (json_result.error()) {
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std::cerr << "Serialization error!\n";
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return 1;
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}
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std::string json = json_result.value();
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std::cout << "Generated JSON (" << json.length() << " bytes):\n";
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// Pretty print first 200 chars
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if (json.length() > 200) {
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std::cout << json.substr(0, 200) << "...\n\n";
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} else {
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std::cout << json << "\n\n";
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}
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// Step 5: Verify round-trip
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std::cout << "🔄 ROUND-TRIP VERIFICATION\n";
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std::cout << "Parsing our generated JSON back...\n";
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GitHubUser user2 = simdjson::from(simdjson::padded_string(json));
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std::cout << "✅ Round-trip successful!\n";
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std::cout << " • Original followers: " << user.followers << "\n";
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std::cout << " • Parsed followers: " << user2.followers << "\n";
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std::cout << " • Name set correctly: " << (user2.name.has_value() && *user2.name == *user.name ? "YES" : "NO") << "\n";
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std::cout << " • Bio preserved: " << (user2.bio.has_value() ? "YES" : "NO") << "\n\n";
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std::cout << "🎉 That's it! Two lines of code for complete JSON handling:\n";
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std::cout << " • Deserialization: simdjson::from(...)\n";
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std::cout << " • Serialization: simdjson::builder::to_json_string(...)\n";
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return 0;
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}
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