deploy: 63c10a51fc

examples/is_discarded__parse.cpp

@@ -0,0 +1,22 @@
+#include <iostream>
+#include <nlohmann/json.hpp>
+
+using json = nlohmann::json;
+
+int main()
+{
+    // parsing invalid JSON without exceptions yields a discarded value
+    json j_invalid = json::parse("[1,2,3", nullptr, false);
+
+    // a callback that discards the top-level value does not leave it
+    // "discarded" -- it is replaced by null instead
+    json j_discarded_by_callback = json::parse("[1,2,3]", [](int /*depth*/, json::parse_event_t event, json& /*parsed*/)
+    {
+        return event != json::parse_event_t::array_start;
+    });
+
+    std::cout << std::boolalpha;
+    std::cout << "j_invalid.is_discarded()               = " << j_invalid.is_discarded() << '\n';
+    std::cout << "j_discarded_by_callback                = " << j_discarded_by_callback << '\n';
+    std::cout << "j_discarded_by_callback.is_discarded() = " << j_discarded_by_callback.is_discarded() << '\n';
+}