Using yaml-cpp to parse YAML files with complex keys

Question

Does lib-yaml support complex keys, for example:

thr:
  - ? {cpu: 1, mem: 1} : 24
  - ? {cpu: 2, mem: 2} : 42

The following test program

#include <yaml-cpp/yaml.h>

int main()
{
    YAML::Node config = YAML::LoadFile("complex_keys.yaml");
}

Fails to parse the YAML file prints the error

terminate called after throwing an instance of 'YAML::ParserException'
  what():  yaml-cpp: error at line 3, column 22: illegal map value
Aborted (core dumped)

The following YAML file also fails to parse with the same error.

---
thr:
  ? 
    cpu: 2
    mem: 1
  : 42

Or am I doing something wrong?

Update

Rather than delete, for posterity's sake, I voted to close my own question after I found a solution from 12 years ago. Back then yaml-cpp parsed the file but today it ~~segfaults~~ terminates. Could this be a yaml-cpp regression?

It does not segfault. It terminates the program: terminate called after throwing an instance of 'YAML::ParserException'. — 3CEZVQ
– 3CEZVQ, Commented Apr 10 at 18:26
Time to file a bug report. I've worked with YAML quite a bit, but I couldn't justify whether this is valid or not, so it may be a challenge to justify. Out of curiosity, what are you using this for? — Ulrich Eckhardt
– Ulrich Eckhardt, Commented Apr 10 at 18:31
@UlrichEckhardt I am designing a config for a that is in some sections a table. I'll file a bug report tonight. — Olumide
– Olumide, Commented Apr 10 at 18:45
What version do you use? I just checkedout the latest released version (0.8.0) and built that and compiled your program using it - no issues. I also compiled the latest on master and tried with that - no issues. — Ted Lyngmo
– Ted Lyngmo, Commented Apr 10 at 19:13
@TedLyngmo I too compiled and ran version 0.8.0 on Ubuntu 22.04.5 LTS. Did you run the example? — Olumide
– Olumide, Commented Apr 11 at 8:48

Olumide · Accepted Answer · 2025-04-11 11:37:37Z

0

I found the problem. NBSPs "found their way" into the file.

Its a silly mistake but an "unsupported character" error on line X would be helpful.

answered Apr 11 at 11:37

Olumide

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1 Comment

Ulrich Eckhardt Apr 12 at 8:48

I wouldn't have guessed that. map is something like a dictionary to me, so I'd have expected something wrong with the values in one of the YAML dicts. So even though you found the problem, a better error message would really help the next person.

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