Yaml-cpp (new API) - nested map / sequence combinations and iteration

Question

I\'m having quite fundamental problems with this api\'s handling of maps vs sequences. Say I have the following structure:

foo_map[\"f1\"] = \"one\";
foo_ma         


        

Answer 1

The YAML file

Node: 
    - Foo:
      f1 : one
      f2 : two
    - Bar:
      b1 : one
      b2 : two

is probably not what you expect. It is a map, with a single key/value pair; the key is Node and the value is a sequence; and each entry of that sequence is a map with three key/value pairs, and the value associated with, e.g., the Foo, is null. This last part is probably not what you expected. I'm guessing you wanted something more like what you actually got, i.e.:

Node:
    Foo:
      f1 : one
      f2 : two
    Bar:
      b1 : one
      b2 : two

The question now is how to parse this structure.

YAML::Node root = /* ... */;
YAML::Node node = root["Node"];

// We now have a map node, so let's iterate through:
for (auto it = node.begin(); it != node.end(); ++it) {
  YAML::Node key = it->first;
  YAML::Node value = it->second;
  if (key.Type() == YAML::NodeType::Scalar) {
    // This should be true; do something here with the scalar key.
  }
  if (value.Type() == YAML::NodeType::Map) {
    // This should be true; do something here with the map.
  }
}