[BUG] No setter function generated for arrays

Created by: julesdent

Bug Report Checklist

[ x] Have you provided a full/minimal spec to reproduce the issue?
[ x] Have you validated the input using an OpenAPI validator (example)?
[ x] What's the version of OpenAPI Generator used?
[ x] Have you search for related issues/PRs?
[ x] What's the actual output vs expected output?
[Optional] Bounty to sponsor the fix (example)

Description

No setter function is generated for an array.

openapi-generator version

4.1.1

OpenAPI declaration file content or url

openapi: 3.0.0
servers:
  - description: SwaggerHub API Auto Mocking
    url: 'https://virtserver.swaggerhub.com/'
info:
  description: API
  version: 1.0.1
  title: API
  termsOfService: 'http://swagger.io/terms/'
tags:
  - name: FuelCosts
paths:
  '/FuelCosts':
    get:
      description: Obtain fuel costs
      tags:
        - FuelCosts
      summary: Get fuel cost
      operationId: GetFuelCostQuery
      responses:
        '200':
          description: Successful operation
          content:
            application/json:
              schema:
                $ref: '#/components/schemas/FuelCost'
      security:
        - ApiKeyAuth: []
components:
  schemas:
    FuelCost:
      type: object
      properties:
        Remarks:
          type: array
          items:
            type: string

Command line used for generation

java -jar openapi-generator-cli-4.1.1.jar generate -i ./Bug.json -g cpp-pistache-server -o generated

Steps to reproduce

Generate the C++ code from the spec. In the generated FuelCost.h, there is a getter function for Remarks but no setter: ///

/// ///

std::vectorstd::string& getRemarks(); bool remarksIsSet() const; void unsetRemarks();

Related issues/PRs

https://github.com/OpenAPITools/openapi-generator/issues/3271

Suggest a fix

As a workaround, you can derive a class from FuelCost and add a setter function manually, but this should really be handled by the generator.