[BUG] [cpp-qt-client] No support for AnyType objects

[danielrenninghoff]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
• Have you validated the input using an OpenAPI validator (example)?
• Have you tested with the latest master to confirm the issue still exists?
• Have you searched for related issues/PRs?
• What's the actual output vs expected output?
• [Optional] Sponsorship to speed up the bug fix or feature request (example)

Description

The cpp-qt-client generator produces invalid code (code that cannot be compiled) for AnyType objects.

...
#include "OAIAnyType.h"
...
QList<OAIAnyType> getArrayOfSomething() const;
...

The header OAIAnyType.h does not exist and is not generated and the type OAIAnyType is defined nowhere.

openapi-generator version

master - 6.0.0

OpenAPI declaration file content or url

Full scheme

arrayOfSomething:
          type: array
          items: {}
          nullable: true

Generation Details

Steps to reproduce

java -jar openapi-generator-cli.jar generate -i https://gist.githubusercontent.com/madrazzl3/da2502b6816aaa98713cba75e595f373/raw/d53da8c6098167768c3e5b1ad1381467397d6a51/example-scheme.yaml -g cpp-qt-client -o generated-client/

Related issues/PRs

Similar problem with other generators:

• C++ UE4: [BUG] [cpp-ue4] Missing AnyType declaration for any-type objects #10266
• C#: [BUG][csharp] Twitter Open API does not compile - Missing AnyType and BaseValidate #7458
• TypeScript: [bug][typescript] AnyType is not defined #6332
• Swift5: [BUG] [Swift5] AnyType is not defined #7617

Suggest a fix

Add type mapping AnyType -> QJsonValue. QJsonValue can be used to manually get the correct type later.