[cpp-restsdk] add support for oneOf via std::variant

docs/generators/cpp-restsdk.md

@@ -249,7 +249,7 @@ These options may be applied as additional-properties (cli) or configOptions (pl
 |Union|✗|OAS3
 |allOf|✗|OAS2,OAS3
 |anyOf|✗|OAS3
-|oneOf|✗|OAS3
+|oneOf|✓|OAS3
 |not|✗|OAS3
 
 ### Security Feature

modules/openapi-generator/src/main/java/org/openapitools/codegen/languages/CppRestSdkClientCodegen.java

@@ -105,7 +105,8 @@ public CppRestSdkClientCodegen() {
                         GlobalFeature.MultiServer
                 )
                 .includeSchemaSupportFeatures(
-                        SchemaSupportFeature.Polymorphism
+                        SchemaSupportFeature.Polymorphism,
+                        SchemaSupportFeature.oneOf
                 )
                 .excludeParameterFeatures(
                         ParameterFeature.Cookie

modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/api-source.mustache

@@ -265,7 +265,7 @@ pplx::task<{{{returnType}}}{{^returnType}}void{{/returnType}}> {{classname}}::{{
     {{/authMethods}}
 
     return m_ApiClient->callApi(localVarPath, utility::conversions::to_string_t("{{httpMethod}}"), localVarQueryParams, localVarHttpBody, localVarHeaderParams, localVarFormParams, localVarFileParams, localVarRequestHttpContentType)
-    .then([=](web::http::http_response localVarResponse)
+    .then([=, this](web::http::http_response localVarResponse)
     {
         if (m_ApiClient->getResponseHandler())
         {
@@ -299,7 +299,7 @@ pplx::task<{{{returnType}}}{{^returnType}}void{{/returnType}}> {{classname}}::{{
         {{#vendorExtensions.x-codegen-response-ishttpcontent}}
         return localVarResponse.extract_vector();
     })
-    .then([=](std::vector<unsigned char> localVarResponse)
+    .then([=, this](std::vector<unsigned char> localVarResponse)
     {
         {{{returnType}}} localVarResult = std::make_shared<HttpContent>();
         std::shared_ptr<std::stringstream> stream = std::make_shared<std::stringstream>(std::string(localVarResponse.begin(), localVarResponse.end()));
@@ -309,7 +309,7 @@ pplx::task<{{{returnType}}}{{^returnType}}void{{/returnType}}> {{classname}}::{{
         {{^vendorExtensions.x-codegen-response-ishttpcontent}}
         return localVarResponse.extract_string();
     })
-    .then([=](utility::string_t localVarResponse)
+    .then([=, this](utility::string_t localVarResponse)
     {
         {{^returnType}}
         return void();

modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/cmake-lists.mustache

@@ -8,16 +8,27 @@
 #
 # NOTE: Auto generated by OpenAPI Generator (https://openapi-generator.tech).
 
-cmake_minimum_required (VERSION 3.1)
+cmake_minimum_required (VERSION 3.5)
 
-project({{{packageName}}})
+project({{{packageName}}} CXX)
 
 # Force -fPIC even if the project is configured for building a static library.
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
-set(CXX_STANDARD_REQUIRED ON)
 
+set(CXX_STANDARD_REQUIRED ON)
 if(NOT CMAKE_CXX_STANDARD)
-    set(CMAKE_CXX_STANDARD 14)
+    if(DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION OR
+       DEFINED CMAKE_CXX20_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 20)
+    elseif(DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION OR
+           DEFINED CMAKE_CXX17_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 17)
+    elseif(DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION OR
+           DEFINED CMAKE_CXX14_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 14)
+    else()
+      set(CMAKE_CXX_STANDARD 11)
+    endif()
 endif()
 
 if(NOT CMAKE_BUILD_TYPE)
@@ -38,12 +49,12 @@ add_library(${PROJECT_NAME} ${HEADER_FILES} ${SOURCE_FILES})
 target_compile_options(${PROJECT_NAME}
     PRIVATE
         $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,$<CXX_COMPILER_ID:GNU>>:
-            -Wall -Wno-unused-variable>
+            -Wall -Wno-unused-variable -Wno-unused-lambda-capture>
 )
 
 target_include_directories(${PROJECT_NAME}
     PUBLIC
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>  
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
@@ -90,4 +101,4 @@ install(
 install(
     EXPORT ${PROJECT_NAME}Targets
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
-)
+)

modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-header.mustache

@@ -24,6 +24,61 @@ namespace {{this}} {
 {{#vendorExtensions.x-forward-declarations}}{{.}}
 {{/vendorExtensions.x-forward-declarations}}
 {{/vendorExtensions.x-has-forward-declarations}}
+{{#oneOf}}{{#-first}}
+#include <variant>
+
+class {{declspec}} {{classname}}
+{
+public:
+    {{classname}}() = default;
+    ~{{classname}}() = default;
+
+    /////////////////////////////////////////////
+
+    void validate();
+
+    web::json::value toJson() const;
+
+    template<typename Target>
+    bool fromJson(const web::json::value& json) {
+        // convert json to Target type
+        Target target;
+        if (!target.fromJson(json)) {
+            return false;
+        }
+
+        m_variantValue = target;
+        return true;
+    }
+
+    void toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) const;
+
+    template<typename Target>
+    bool fromMultiPart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix) {
+        // convert multipart to Target type
+        Target target;
+        if (!target.fromMultiPart(multipart, namePrefix)) {
+            return false;
+        }
+
+        m_variantValue = target;
+        return true;
+    }
+
+    /////////////////////////////////////////////
+    /// {{classname}} members
+
+    using VariantType = std::variant<{{#oneOf}}{{^-first}}, {{/-first}}{{{.}}}{{/oneOf}}>;
+
+    const VariantType& getVariant() const;
+    void setVariant(VariantType value);
+
+protected:
+    VariantType m_variantValue;
+};
+
+{{/-first}}{{/oneOf}}
+{{^oneOf}}
 {{#isEnum}}
 class {{declspec}} {{classname}}
     : public {{{parent}}}{{^parent}}ModelBase{{/parent}}
@@ -120,6 +175,7 @@ protected:
 };
 
 {{/isEnum}}
+{{/oneOf}}
 
 {{#modelNamespaceDeclarations}}
 }

modules/openapi-generator/src/main/resources/cpp-rest-sdk-client/model-source.mustache

@@ -6,7 +6,56 @@
 {{#modelNamespaceDeclarations}}
 namespace {{this}} {
 {{/modelNamespaceDeclarations}}
+{{#oneOf}}{{#-first}}
 
+void {{classname}}::validate()
+{
+    // TODO: implement validation
+}
+
+const {{classname}}::VariantType& {{classname}}::getVariant() const
+{
+    return m_variantValue;
+}
+
+void {{classname}}::setVariant({{classname}}::VariantType value)
+{
+    m_variantValue = value;
+}
+
+web::json::value {{classname}}::toJson() const
+{
+    web::json::value val = web::json::value::object();
+
+    std::visit([&](auto&& arg) {
+        using T = std::decay_t<decltype(arg)>;
+        if constexpr (std::is_same_v<T, std::monostate>) {
+            val = web::json::value::null();
+        } else {
+            val = arg.toJson();
+        }
+    }, m_variantValue);
+
+    return val;
+}
+
+void {{classname}}::toMultipart(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& prefix) const
+{
+    std::visit([&](auto&& arg) {
+        using T = std::decay_t<decltype(arg)>;
+        if constexpr (!std::is_same_v<T, std::monostate>) {
+          arg.toMultipart(multipart, prefix);
+        }
+    }, m_variantValue);
+}
+
+{{#oneOf}}
+template bool {{classname}}::fromJson<{{.}}>(const web::json::value& json);
+template bool {{classname}}::fromMultiPart<{{.}}>(std::shared_ptr<MultipartFormData> multipart, const utility::string_t& namePrefix);
+{{/oneOf}}
+
+{{/-first}}{{/oneOf}}
+{{^oneOf}}
 {{#isEnum}}
 
 namespace
@@ -269,6 +318,7 @@ void {{classname}}::unset{{name}}()
 {{/isInherited}}
 {{/vars}}
 {{/isEnum}}
+{{/oneOf}}
 {{#modelNamespaceDeclarations}}
 }
 {{/modelNamespaceDeclarations}}

modules/openapi-generator/src/test/resources/3_0/cpp-restsdk/petstore.yaml

@@ -569,6 +569,27 @@ paths:
           description: User not found
       security:
         - api_key: []
+  /user_or_pet:
+    post:
+      tags:
+        - user_or_pet
+      summary: Create user or pet
+      description: This can only be done by the logged in user or pet.
+      operationId: createUserOrPet
+      responses:
+        default:
+          description: successful operation
+      security:
+        - api_key: []
+      requestBody:
+        content:
+          application/json:
+            schema:
+              oneOf:
+                - $ref: '#/components/schemas/User'
+                - $ref: '#/components/schemas/Pet'
+        description: Created user or pet object
+        required: true
 externalDocs:
   description: Find out more about Swagger
   url: 'http://swagger.io'

samples/client/petstore/cpp-restsdk/client/.openapi-generator/FILES

@@ -16,8 +16,10 @@ include/CppRestPetstoreClient/Object.h
 include/CppRestPetstoreClient/api/PetApi.h
 include/CppRestPetstoreClient/api/StoreApi.h
 include/CppRestPetstoreClient/api/UserApi.h
+include/CppRestPetstoreClient/api/UserOrPetApi.h
 include/CppRestPetstoreClient/model/ApiResponse.h
 include/CppRestPetstoreClient/model/Category.h
+include/CppRestPetstoreClient/model/CreateUserOrPet_request.h
 include/CppRestPetstoreClient/model/Order.h
 include/CppRestPetstoreClient/model/Pet.h
 include/CppRestPetstoreClient/model/SchemaWithSet.h
@@ -37,8 +39,10 @@ src/Object.cpp
 src/api/PetApi.cpp
 src/api/StoreApi.cpp
 src/api/UserApi.cpp
+src/api/UserOrPetApi.cpp
 src/model/ApiResponse.cpp
 src/model/Category.cpp
+src/model/CreateUserOrPet_request.cpp
 src/model/Order.cpp
 src/model/Pet.cpp
 src/model/SchemaWithSet.cpp

samples/client/petstore/cpp-restsdk/client/CMakeLists.txt

@@ -8,16 +8,27 @@
 #
 # NOTE: Auto generated by OpenAPI Generator (https://openapi-generator.tech).
 
-cmake_minimum_required (VERSION 3.1)
+cmake_minimum_required (VERSION 3.5)
 
-project(CppRestPetstoreClient)
+project(CppRestPetstoreClient CXX)
 
 # Force -fPIC even if the project is configured for building a static library.
 set(CMAKE_POSITION_INDEPENDENT_CODE ON)
-set(CXX_STANDARD_REQUIRED ON)
 
+set(CXX_STANDARD_REQUIRED ON)
 if(NOT CMAKE_CXX_STANDARD)
-    set(CMAKE_CXX_STANDARD 14)
+    if(DEFINED CMAKE_CXX20_STANDARD_COMPILE_OPTION OR
+       DEFINED CMAKE_CXX20_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 20)
+    elseif(DEFINED CMAKE_CXX17_STANDARD_COMPILE_OPTION OR
+           DEFINED CMAKE_CXX17_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 17)
+    elseif(DEFINED CMAKE_CXX14_STANDARD_COMPILE_OPTION OR
+           DEFINED CMAKE_CXX14_EXTENSION_COMPILE_OPTION)
+      set(CMAKE_CXX_STANDARD 14)
+    else()
+      set(CMAKE_CXX_STANDARD 11)
+    endif()
 endif()
 
 if(NOT CMAKE_BUILD_TYPE)
@@ -38,12 +49,12 @@ add_library(${PROJECT_NAME} ${HEADER_FILES} ${SOURCE_FILES})
 target_compile_options(${PROJECT_NAME}
     PRIVATE
         $<$<OR:$<CXX_COMPILER_ID:Clang>,$<CXX_COMPILER_ID:AppleClang>,$<CXX_COMPILER_ID:GNU>>:
-            -Wall -Wno-unused-variable>
+            -Wall -Wno-unused-variable -Wno-unused-lambda-capture>
 )
 
 target_include_directories(${PROJECT_NAME}
     PUBLIC
-        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>  
+        $<BUILD_INTERFACE:${CMAKE_CURRENT_SOURCE_DIR}/include>
         $<INSTALL_INTERFACE:${CMAKE_INSTALL_INCLUDEDIR}>
 )
 
@@ -90,4 +101,4 @@ install(
 install(
     EXPORT ${PROJECT_NAME}Targets
     DESTINATION ${CMAKE_INSTALL_LIBDIR}/cmake/${PROJECT_NAME}
-)
+)