config_node parent_node = ...; for (auto child_node : parent_node.child_range()) { // process child_node }In this example, we obtain a range object from the parent_node, which we can then use to iterate over all child nodes of the parent_node. The `auto` keyword is used to infer the type of the `child_node` variable, which will be a `config_node` in this case. This functionality is part of the Boost Property Tree library, which provides a convenient way to access and manipulate configuration data in a hierarchical structure. The `cpp` in the name likely refers to the fact that the library is implemented in C++, and it is a popular choice for configuration management in C++ projects.