deploy: 40a62947d3

api/basic_json/back.md

@@ -46,13 +46,58 @@ Constant.
     The following code shows an example for `back()`.
      
     ```cpp
-    --8<-- "examples/back.cpp"
+    #include <iostream>
+    #include <nlohmann/json.hpp>
+    
+    using json = nlohmann::json;
+    
+    int main()
+    {
+        // create JSON values
+        json j_boolean = true;
+        json j_number_integer = 17;
+        json j_number_float = 23.42;
+        json j_object = {{"one", 1}, {"two", 2}};
+        json j_object_empty(json::value_t::object);
+        json j_array = {1, 2, 4, 8, 16};
+        json j_array_empty(json::value_t::array);
+        json j_string = "Hello, world";
+    
+        // call back()
+        std::cout << j_boolean.back() << '\n';
+        std::cout << j_number_integer.back() << '\n';
+        std::cout << j_number_float.back() << '\n';
+        std::cout << j_object.back() << '\n';
+        //std::cout << j_object_empty.back() << '\n';  // undefined behavior
+        std::cout << j_array.back() << '\n';
+        //std::cout << j_array_empty.back() << '\n';   // undefined behavior
+        std::cout << j_string.back() << '\n';
+    
+        // back() called on a null value
+        try
+        {
+            json j_null;
+            j_null.back();
+        }
+        catch (const json::invalid_iterator& e)
+        {
+            std::cout << e.what() << '\n';
+        }
+    }
+    
     ```
     
     Output:
     
     ```json
-    --8<-- "examples/back.output"
+    true
+    17
+    23.42
+    2
+    16
+    "Hello, world"
+    [json.exception.invalid_iterator.214] cannot get value
+    
     ```
 
 ## See also