[C++][Pistache] Fix 'unused-parameter' warning on Helpers.h file (#19315)

Author: sjoubert

modules/openapi-generator/src/main/resources/cpp-pistache-server/helpers-header.mustache

@@ -84,10 +84,10 @@ namespace {{helpersNamespace}}
     }
 
     /// <summary>
-    /// Determine if the given vector<T> only has unique elements. T must provide the == operator.
+    /// Determine if the given set<T> only has unique elements.
     /// </summary>
     template <typename T>
-    bool hasOnlyUniqueItems(const std::set<T>& set)
+    bool hasOnlyUniqueItems(const std::set<T>&)
     {
         return true;
     }

samples/server/petstore/cpp-pistache-everything/model/Helpers.h

@@ -94,10 +94,10 @@ namespace org::openapitools::server::helpers
     }
 
     /// <summary>
-    /// Determine if the given vector<T> only has unique elements. T must provide the == operator.
+    /// Determine if the given set<T> only has unique elements.
     /// </summary>
     template <typename T>
-    bool hasOnlyUniqueItems(const std::set<T>& set)
+    bool hasOnlyUniqueItems(const std::set<T>&)
     {
         return true;
     }

samples/server/petstore/cpp-pistache-nested-schema-refs/model/Helpers.h

@@ -94,10 +94,10 @@ namespace org::openapitools::server::helpers
     }
 
     /// <summary>
-    /// Determine if the given vector<T> only has unique elements. T must provide the == operator.
+    /// Determine if the given set<T> only has unique elements.
     /// </summary>
     template <typename T>
-    bool hasOnlyUniqueItems(const std::set<T>& set)
+    bool hasOnlyUniqueItems(const std::set<T>&)
     {
         return true;
     }

samples/server/petstore/cpp-pistache/model/Helpers.h

@@ -94,10 +94,10 @@ namespace org::openapitools::server::helpers
     }
 
     /// <summary>
-    /// Determine if the given vector<T> only has unique elements. T must provide the == operator.
+    /// Determine if the given set<T> only has unique elements.
     /// </summary>
     template <typename T>
-    bool hasOnlyUniqueItems(const std::set<T>& set)
+    bool hasOnlyUniqueItems(const std::set<T>&)
     {
         return true;
     }