[BUG][C++][cpp-pistache-server] An api receiving a std::optional parameter generates a org::openapitools::server::model::std::optional<...> that doesn't compile

[mlebihan]

Bug Report Checklist

• Have you provided a full/minimal spec to reproduce the issue?
  Conditions are the same than in the issue
  [C++] Error making the cpprestsdk generated files

Description

This issue has for goal to reduce the amount of work required to resolve the #6726
apart that the problem described here affects cpp-pistache-server generator and not cpp-resksdk one.

the generator generate this, if an std::optional parameter is passed to an api call:

const org::openapitools::server::model::std::optional<org::openapitools::server::model::GetAccountVideos_categoryOneOf_parameter> &categoryOneOf

this doesn't compile.

Suggest a fix

This should be replaced by:

const std::optional<org::openapitools::server::model::GetAccountVideos_categoryOneOf_parameter> &categoryOneOf

openapi-generator version

7.6.0

Related issues/PRs

[C++] Error making the cpprestsdk generated files

[mlebihan]

The correction provided with the PR accompanying this issue doesn't correct all the #6726 troubles.

It reduces its compilation error list from:

error: 'AbuseStateSet' was not declared in this scope; did you mean 'org::openapitools::server::model::AbuseStateSet'?
error: cannot convert 'std::optional<org::openapitools::server::model::AbuseStateSet>' to 'const int&'
error: cannot convert 'std::optional<org::openapitools::server::model::VideoPlaylistTypeSet>' to 'const int&'
error: expected ';' at end of member declaration
error: expected ')' before '<' token
error: expected unqualified-id before '<' token
error: no match for 'operator>>' (operand types are 'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} and 'org::openapitools::server::model::_api_v1_videos_ownership__id__accept_post_id_parameter')
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::AbuseStateSet&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_categoryOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_languageOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_licenceOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_tagsAllOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_tagsOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::VideoPlaylistTypeSet&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::VideoPrivacySet&)'
error: no type named 'type' in 'struct std::enable_if<false, void>'
error: 'Pistache::Http::ResponseWriter::ResponseWriter(const Pistache::Http::ResponseWriter&)' is private within this context
error: 'std' in namespace 'org::openapitools::server::model' does not name a type
error: template argument 1 is invalid
error: 'VideoPlaylistTypeSet' was not declared in this scope; did you mean 'org::openapitools::server::model::VideoPlaylistTypeSet'?

to

error: no match for 'operator>>' (operand types are 'std::istringstream' {aka 'std::__cxx11::basic_istringstream<char>'} and 'org::openapitools::server::model::_api_v1_videos_ownership__id__accept_post_id_parameter')
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::AbuseStateSet&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_categoryOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_languageOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_licenceOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_tagsAllOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::GetAccountVideos_tagsOneOf_parameter&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::VideoPlaylistTypeSet&)'
error: no matching function for call to 'fromStringValue(std::__cxx11::basic_string<char>&, org::openapitools::server::model::VideoPrivacySet&)'
error: no type named 'type' in 'struct std::enable_if<false, void>'

That puts cpp-pistache-server generator at the same "level of compilation problems" than cpp-restsdk face to #6726.