App: Add Document::addObject<T>(...) to simplify code

src/App/Document.cpp

@@ -3544,7 +3544,7 @@ DocumentObject* Document::addObject(const char* sType,
                                     const char* viewType,
                                     bool isPartial)
 {
-    Base::Type type =
+    const Base::Type type =
         Base::Type::getTypeIfDerivedFrom(sType, App::DocumentObject::getClassTypeId(), true);
     if (type.isBad()) {
         std::stringstream str;
@@ -3557,8 +3557,7 @@ DocumentObject* Document::addObject(const char* sType,
         return nullptr;
     }
 
-    App::DocumentObject* pcObject = static_cast<App::DocumentObject*>(typeInstance);
-
+    auto* pcObject = static_cast<App::DocumentObject*>(typeInstance);
     pcObject->setDocument(this);
 
     // do no transactions if we do a rollback!
@@ -3571,15 +3570,8 @@ DocumentObject* Document::addObject(const char* sType,
     }
 
     // get Unique name
-    string ObjectName;
-
-    if (pObjectName && pObjectName[0] != '\0') {
-        ObjectName = getUniqueObjectName(pObjectName);
-    }
-    else {
-        ObjectName = getUniqueObjectName(sType);
-    }
-
+    const bool hasName = pObjectName && pObjectName[0] != '\0';
+    const string ObjectName = getUniqueObjectName(hasName ? pObjectName : type.getName());
 
     d->activeObject = pcObject;
 

src/App/Document.h

@@ -268,6 +268,21 @@ public:
                               bool isNew = true,
                               const char* viewType = nullptr,
                               bool isPartial = false);
+    //@{
+    /** Add a feature of T type with sName (ASCII) to this document and set it active.
+     * Unicode names are set through the Label property.
+     * @param pObjectName if nonNULL use that name otherwise generate a new unique name based on the
+     * \a sType
+     * @param isNew       if false don't call the \c DocumentObject::setupObject() callback (default
+     * is true)
+     * @param viewType    override object's view provider name
+     * @param isPartial   indicate if this object is meant to be partially loaded
+     */
+    template<typename T>
+    T* addObject(const char* pObjectName = nullptr,
+                 bool isNew = true,
+                 const char* viewType = nullptr,
+                 bool isPartial = false);
     /** Add an array of features of the given types and names.
      * Unicode names are set through the Label property.
      * @param sType       The type of created object
@@ -662,6 +677,12 @@ inline int Document::countObjectsOfType() const
     return this->countObjectsOfType(T::getClassTypeId());
 }
 
+template<typename T>
+T* Document::addObject(const char* pObjectName, bool isNew, const char* viewType, bool isPartial)
+{
+    static_assert(std::is_base_of<DocumentObject, T>::value, "T must be derived from DocumentObject");
+    return static_cast<T*>(addObject(T::getClassName(), pObjectName, isNew, viewType, isPartial));
+}
 
 }  // namespace App