update ceph source to reef 18.1.2

[ceph.git] / ceph / src / jaegertracing / opentelemetry-cpp / third_party / nlohmann-json / doc / examples / get_to.cpp

diff --git a/ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/examples/get_to.cpp b/ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/examples/get_to.cpp
new file mode 100644 (file)
index 0000000..4705b17
--- /dev/null
+++ b/ceph/src/jaegertracing/opentelemetry-cpp/third_party/nlohmann-json/doc/examples/get_to.cpp
@@ -0,0 +1,60 @@
+#include <iostream>
+#include <unordered_map>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // create a JSON value with different types
+    json json_types =
+    {
+        {"boolean", true},
+        {
+            "number", {
+                {"integer", 42},
+                {"floating-point", 17.23}
+            }
+        },
+        {"string", "Hello, world!"},
+        {"array", {1, 2, 3, 4, 5}},
+        {"null", nullptr}
+    };
+
+    bool v1;
+    int v2;
+    short v3;
+    float v4;
+    int v5;
+    std::string v6;
+    std::vector<short> v7;
+    std::unordered_map<std::string, json> v8;
+
+
+    // use explicit conversions
+    json_types["boolean"].get_to(v1);
+    json_types["number"]["integer"].get_to(v2);
+    json_types["number"]["integer"].get_to(v3);
+    json_types["number"]["floating-point"].get_to(v4);
+    json_types["number"]["floating-point"].get_to(v5);
+    json_types["string"].get_to(v6);
+    json_types["array"].get_to(v7);
+    json_types.get_to(v8);
+
+    // print the conversion results
+    std::cout << v1 << '\n';
+    std::cout << v2 << ' ' << v3 << '\n';
+    std::cout << v4 << ' ' << v5 << '\n';
+    std::cout << v6 << '\n';
+
+    for (auto i : v7)
+    {
+        std::cout << i << ' ';
+    }
+    std::cout << "\n\n";
+
+    for (auto i : v8)
+    {
+        std::cout << i.first << ": " << i.second << '\n';
+    }
+}