add method to remove elements from PropertyLinkSubList

src/App/PropertyLinks.cpp

@@ -719,7 +719,7 @@ void PropertyLinkSubList::setValue(DocumentObject* lValue, const std::vector<str
     hasSetValue();
 }
 
-const string PropertyLinkSubList::getPyReprString()
+const string PropertyLinkSubList::getPyReprString() const
 {
     assert(this->_lValueList.size() == this->_lSubList.size());
 
@@ -760,6 +760,30 @@ DocumentObject *PropertyLinkSubList::getValue() const
     return ret;
 }
 
+int PropertyLinkSubList::removeValue(App::DocumentObject *lValue)
+{
+    assert(this->_lValueList.size() == this->_lSubList.size());
+
+    std::size_t num = std::count(this->_lValueList.begin(), this->_lValueList.end(), lValue);
+    if (num == 0)
+        return 0;
+
+    std::vector<DocumentObject*> links;
+    std::vector<std::string> subs;
+    links.reserve(this->_lValueList.size() - num);
+    subs.reserve(this->_lSubList.size() - num);
+
+    for (std::size_t i=0; i<this->_lValueList.size(); ++i) {
+        if (this->_lValueList[i] != lValue) {
+            links.push_back(this->_lValueList[i]);
+            subs.push_back(this->_lSubList[i]);
+        }
+    }
+
+    setValues(links, subs);
+    return static_cast<int>(num);
+}
+
 void PropertyLinkSubList::setSubListValues(const std::vector<PropertyLinkSubList::SubSet>& values)
 {
     std::vector<DocumentObject*> links;

src/App/PropertyLinks.h

@@ -362,11 +362,11 @@ public:
         return _lValueList;
     }
 
-    const std::string getPyReprString();
+    const std::string getPyReprString() const;
 
     /**
      * @brief getValue emulates the action of a single-object link.
-     * @return reference to object, if the link os to only one object. NULL if
+     * @return reference to object, if the link is to only one object. NULL if
      * the link is empty, or links to subelements of more than one documant
      * object.
      */
@@ -376,6 +376,12 @@ public:
         return _lSubList;
     }
 
+    /**
+     * @brief Removes all occurrences of \a lValue in the property
+     * together with its sub-elements and returns the number of entries removed.
+     */
+    int removeValue(App::DocumentObject *lValue);
+
     void setSubListValues(const std::vector<SubSet>&);
     std::vector<SubSet> getSubListValues() const;