deploy: 94fe31eb9b

examples/view_mode.cpp

@@ -0,0 +1,36 @@
+#include <iostream>
+#include <nlohmann/json_view.hpp>
+
+using nlohmann::basic_json_view;
+using nlohmann::view_mode;
+
+// accepts the views of read-only and of editable documents, of json and of ordered_json
+template<typename BasicJsonType, view_mode Mode>
+std::size_t count_members(basic_json_view<BasicJsonType, Mode> v)
+{
+    return v.is_object() ? v.size() : 0;
+}
+
+// accepts only the views of editable documents
+template<typename BasicJsonType>
+bool is_edited(basic_json_view<BasicJsonType, view_mode::editable> v)
+{
+    return v.is_string() && v.get_string() == "edited";
+}
+
+// a function (no template) taking a json_editable_view also accepts the view of a read-only document
+std::size_t size_of(nlohmann::json_editable_view v)
+{
+    return v.size();
+}
+
+int main()
+{
+    const nlohmann::json_document doc = nlohmann::json_document::parse(R"({"a": 1, "b": 2})");
+    nlohmann::json_editable_document edoc = nlohmann::json_editable_document::parse(R"({"a": 1})");
+    edoc.set(edoc.root()["a"], "edited");
+
+    std::cout << count_members(doc.root()) << ' ' << count_members(edoc.root()) << '\n';
+    std::cout << std::boolalpha << is_edited(edoc.root()["a"]) << '\n';
+    std::cout << size_of(doc.root()) << ' ' << size_of(edoc.root()) << '\n';
+}