Use std::optional if available.

Currently, SDK requires C++11 minimum.
So, boost::optional type is used for optional values.
For C++17 and above more convenient is to use std::optional instead.
The task NLAM-23 is about making this type configurable.
This commit is a third part of the task: olp-cpp-sdk-read.

Relates-To: NLAM-23
Signed-off-by: sopov <[email protected]>

Author: asopov-here

olp-cpp-sdk-dataservice-read/include/olp/dataservice/read/CatalogRequest.h

@@ -25,7 +25,7 @@
 
 #include <olp/dataservice/read/DataServiceReadApi.h>
 #include <olp/dataservice/read/FetchOptions.h>
-#include <boost/optional.hpp>
+#include <olp/core/porting/optional.hpp>
 
 namespace olp {
 namespace dataservice {
@@ -43,10 +43,10 @@ class DATASERVICE_READ_API CatalogRequest final {
    * billing records together. If supplied, it must be 4–16 characters
    * long and contain only alphanumeric ASCII characters [A-Za-z0-9].
    *
-   * @return The `BillingTag` string or `boost::none` if the billing tag is not
-   * set.
+   * @return The `BillingTag` string or `olp::porting::none` if the billing tag
+   * is not set.
    */
-  inline const boost::optional<std::string>& GetBillingTag() const {
+  const porting::optional<std::string>& GetBillingTag() const {
     return billing_tag_;
   }
 
@@ -55,27 +55,13 @@ class DATASERVICE_READ_API CatalogRequest final {
    *
    * @see `GetBillingTag()` for information on usage and format.
    *
-   * @param tag The `BillingTag` string or `boost::none`.
+   * @param tag The `BillingTag` string or `olp::porting::none`.
    *
    * @return A reference to the updated `CatalogRequest` instance.
    */
-  inline CatalogRequest& WithBillingTag(boost::optional<std::string> tag) {
-    billing_tag_ = std::move(tag);
-    return *this;
-  }
-
-  /**
-   * @brief Sets the billing tag for the request.
-   *
-   * @see `GetBillingTag()` for information on usage and format.
-   *
-   * @param tag The rvalue reference to the `BillingTag` string or
-   * `boost::none`.
-   *
-   * @return A reference to the updated `CatalogRequest` instance.
-   */
-  inline CatalogRequest& WithBillingTag(std::string&& tag) {
-    billing_tag_ = std::move(tag);
+  template <class T = porting::optional<std::string>>
+  CatalogRequest& WithBillingTag(T&& tag) {
+    billing_tag_ = std::forward<T>(tag);
     return *this;
   }
 
@@ -87,7 +73,7 @@ class DATASERVICE_READ_API CatalogRequest final {
    *
    * @return The fetch option.
    */
-  inline FetchOptions GetFetchOption() const { return fetch_option_; }
+  FetchOptions GetFetchOption() const { return fetch_option_; }
 
   /**
    * @brief Sets the fetch option that you can use to set the source from
@@ -99,7 +85,7 @@ class DATASERVICE_READ_API CatalogRequest final {
    *
    * @return A reference to the updated `CatalogVersionRequest` instance.
    */
-  inline CatalogRequest& WithFetchOption(FetchOptions fetch_option) {
+  CatalogRequest& WithFetchOption(const FetchOptions fetch_option) {
     fetch_option_ = fetch_option;
     return *this;
   }
@@ -109,17 +95,17 @@ class DATASERVICE_READ_API CatalogRequest final {
    *
    * @return A string representation of the request.
    */
-  inline std::string CreateKey() const {
+  std::string CreateKey() const {
     std::stringstream out;
     if (GetBillingTag()) {
-      out << "$" << GetBillingTag().get();
+      out << "$" << *GetBillingTag();
     }
     out << "^" << GetFetchOption();
     return out.str();
   }
 
  private:
-  boost::optional<std::string> billing_tag_;
+  porting::optional<std::string> billing_tag_;
   FetchOptions fetch_option_{OnlineIfNotFound};
 };
 

olp-cpp-sdk-dataservice-read/include/olp/dataservice/read/CatalogVersionRequest.h

@@ -23,7 +23,7 @@
 #include <string>
 #include <utility>
 
-#include <boost/optional.hpp>
+#include <olp/core/porting/optional.hpp>
 
 #include "DataServiceReadApi.h"
 #include "FetchOptions.h"
@@ -57,7 +57,7 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    *
    * @return A reference to the updated `CatalogVersionRequest` instance.
    */
-  inline CatalogVersionRequest& WithStartVersion(int64_t startVersion) {
+  CatalogVersionRequest& WithStartVersion(int64_t startVersion) {
     start_version_ = startVersion;
     return *this;
   }
@@ -69,10 +69,10 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    * billing records together. If supplied, it must be 4–16 characters
    * long and contain only alphanumeric ASCII characters [A-Za-z0-9].
    *
-   * @return The `BillingTag` string or `boost::none` if the billing tag is not
-   * set.
+   * @return The `BillingTag` string or `olp::porting::none` if the billing tag
+   * is not set.
    */
-  inline const boost::optional<std::string>& GetBillingTag() const {
+  const porting::optional<std::string>& GetBillingTag() const {
     return billing_tag_;
   }
 
@@ -81,28 +81,13 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    *
    * @see `GetBillingTag()` for information on usage and format.
    *
-   * @param billingTag The `BillingTag` string or `boost::none`.
+   * @param billingTag The `BillingTag` string or `olp::porting::none`.
    *
    * @return A reference to the updated `CatalogVersionRequest` instance.
    */
-  inline CatalogVersionRequest& WithBillingTag(
-      boost::optional<std::string> billingTag) {
-    billing_tag_ = std::move(billingTag);
-    return *this;
-  }
-
-  /**
-   * @brief Sets the billing tag for the request.
-   *
-   * @see `GetBillingTag()` for information on usage and format.
-   *
-   * @param billingTag The rvalue reference to the `BillingTag` string or
-   * `boost::none`.
-   *
-   * @return A reference to the updated `CatalogVersionRequest` instance.
-   */
-  inline CatalogVersionRequest& WithBillingTag(std::string&& billingTag) {
-    billing_tag_ = std::move(billingTag);
+  template <class T = porting::optional<std::string>>
+  CatalogVersionRequest& WithBillingTag(T&& billingTag) {
+    billing_tag_ = std::forward<T>(billingTag);
     return *this;
   }
 
@@ -114,7 +99,7 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    *
    * @return The fetch option.
    */
-  inline FetchOptions GetFetchOption() const { return fetch_option_; }
+  FetchOptions GetFetchOption() const { return fetch_option_; }
 
   /**
    * @brief Sets the fetch option that you can use to set the source from
@@ -126,7 +111,7 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    *
    * @return A reference to the updated `CatalogVersionRequest` instance.
    */
-  inline CatalogVersionRequest& WithFetchOption(FetchOptions fetchoption) {
+  CatalogVersionRequest& WithFetchOption(FetchOptions fetchoption) {
     fetch_option_ = fetchoption;
     return *this;
   }
@@ -136,13 +121,13 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
    *
    * @return A string representation of the request.
    */
-  inline std::string CreateKey() const {
+  std::string CreateKey() const {
     std::stringstream out;
 
     out << "@" << GetStartVersion();
 
     if (GetBillingTag()) {
-      out << "$" << GetBillingTag().get();
+      out << "$" << *GetBillingTag();
     }
 
     out << "^" << GetFetchOption();
@@ -152,7 +137,7 @@ class DATASERVICE_READ_API CatalogVersionRequest final {
 
  private:
   int64_t start_version_{-1};
-  boost::optional<std::string> billing_tag_;
+  porting::optional<std::string> billing_tag_;
   FetchOptions fetch_option_{OnlineIfNotFound};
 };
 

olp-cpp-sdk-dataservice-read/include/olp/dataservice/read/ConsumerProperties.h

@@ -25,7 +25,7 @@
 #include <vector>
 
 #include <olp/dataservice/read/DataServiceReadApi.h>
-#include <boost/optional.hpp>
+#include <olp/core/porting/optional.hpp>
 
 namespace olp {
 namespace dataservice {