YAML Emitter using YAML::DoubleQuoted when emitted in a destructor of a staticly created struct/class

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Dal 20/9/2026.

  • #1500 di @alex-thiessen-for-siemens — aperta

Valutazione

Difficoltà
4/5
Tempo stimato
3-5 giorni
Idoneità per principianti
35/100
Tipo di issue
Bug
Chiarezza
Abbastanza chiara
Stato di attività
Ferma
Stack tecnologico
cpp, yaml
Ambito
backend

Direzione di ricerca

Start with the issue’s example and inspect emitter.h, especially YAML::Emitter::Write(const std::string&) and its StringFormat::value regex check. Reproduce the output difference between the call in main() and the destructor, then trace why the regex match changes during static destruction. Done means both serializations emit the same unquoted YAML; the issue does not name a test file.

Scritto dal modello di indicizzazione a partire dal testo della issue.

Descrizione

bug

What steps will reproduce the problem?

  1. Create a struct/class containing a destructor and a function to serialize an arbitrary type of data, with the destructor calling the serialization function.

  2. Create a static instance of that class and call the serilization function at least once.

What is the expected output? What do you see instead?
The expected output would be to see the serialized data, as many times as requested, beeing exactly the same, however, the last time the yaml string is printed, all keys, as well as all strings, are wrapped in double quotes.

Example

struct EmitterTest
{
    ~EmitterTest()
    {
        Serialize();
    }

    void Serialize()
    {
        YAML::Emitter out;

        out << YAML::BeginMap << YAML::Key << "Test";
        out << YAML::BeginMap;
        out << YAML::Key << "String1" << YAML::Value << "String1";
        out << YAML::Key << "String2" << YAML::Value << "String2";
        out << YAML::Key << "String3" << YAML::Value << "Foo";
        out << YAML::EndMap;
        out << YAML::EndMap;

        std::cout << out.c_str() << std::endl;
    }
}

static EmitterTest s_Test;

int main()
{
    s_Test.Serialize();
}

Expected output:

Test:
  String1: String1
  String2: String2
  String3: Foo
Test:
  String1: String1
  String2: String2
  String3: Foo

Actual output:

Test:
  String1: String1
  String2: String2
  String3: Foo
"Test":
  "String1": "String1"
  "String2": "String2"
  "String3": "Foo"

yaml-cpp version: 0.8.0

Additional Information
Note that this only happens when Serialize() is called once before destruction. Digging into the problem makes the problem pretty obvious: In emitter.h the function YAML::Emitter::Write(const std::string&) queries the StringFormat::value, by trying to match the string with a regex. This regex match returns false in the serialization called in the destructor, otherwise it returns true.

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