docs

site/doc/pages/2_DValue_key.txt

@@ -0,0 +1,19 @@
+:sig
+DValue* DValue::key(String s)
+const DValue* DValue::key(String s) const
+
+:params
+s : child key to find
+return value : pointer to existing child, or 0
+
+:see
+0_DValue
+2_DValue_has
+2_DValue_get_or_create
+
+:content
+Looks up one child without creating it. The non-const overload forwards through references; both overloads return `0` for scalars or missing keys.
+
+```cpp
+if(const DValue* user = payload.key("user")) print(user->to_json());
+```