How to create a node where key is a dynamic string? about rapidyaml HOT 2 CLOSED

You either keep the string around or serialize to the tree's arena. To achieve the latter using the node API, use a combination of operator<< and the disambiguation function ryml::key() (otherwise, it would serialize the string as a val). See the relevant example in the quickstart.

In your case:

std::string k = "mykey";
node << ryml::key(k); // serialize the key to the arena
node << 1; // serialize the value to the arena

or quite simply:

node << ryml::key(key) << 1;

Internally, operator<<(ryml::key(k)) will call tree.copy_to_arena().
You can also do it directly yourself. This sample has the same effect as above:

ryml::csubstr key_copy = node.tree()->copy_to_arena(key);
node[key_copy] << 1;

from rapidyaml.

perfect! thank you!

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