Implement Property copy(src_idx, dst_idx) analogue of OpenMesh properties.

This allows assigning property values even if the property type is
unknown, e.g. when iterating over mesh properties.

src/OpenVolumeMesh/Core/BaseProperty.hh

@@ -69,6 +69,8 @@ public:
 
     virtual void swap_elements(size_t _idx0, size_t _idx1) = 0;
 
+    virtual void copy(size_t _src_idx, size_t _dst_idx) = 0;
+
     virtual void serialize(std::ostream& _ostr) const = 0;
 
     virtual void deserialize(std::istream& _istr) = 0;

src/OpenVolumeMesh/Core/OpenVolumeMeshProperty.hh

@@ -112,10 +112,12 @@ public:
 	virtual void swap(size_t _i0, size_t _i1) {
 		std::swap(data_[_i0], data_[_i1]);
 	}
-
-        void delete_element(size_t _idx) {
-                data_.erase(data_.begin() + _idx);
-        }
+	virtual void copy(size_t _src_idx, size_t _dst_idx) {
+		data_[_dst_idx] = data_[_src_idx];
+	}
+	void delete_element(size_t _idx) {
+		data_.erase(data_.begin() + _idx);
+	}
 
 public:
 
@@ -273,6 +275,9 @@ public:
         data_[_i0] = data_[_i1];
         data_[_i1] = t;
     }
+    virtual void copy(size_t _src_idx, size_t _dst_idx) {
+        data_[_dst_idx] = data_[_src_idx];
+    }
 
     void delete_element(size_t _idx) {
         data_.erase(data_.begin() + _idx);
@@ -408,7 +413,9 @@ public:
     virtual void swap(size_t _i0, size_t _i1) {
         std::swap(data_[_i0], data_[_i1]);
     }
-
+    virtual void copy(size_t _src_idx, size_t _dst_idx) {
+        data_[_dst_idx] = data_[_src_idx];
+    }
     virtual void delete_element(size_t _idx) {
         data_.erase(data_.begin() + _idx);
     }

src/OpenVolumeMesh/Core/PropertyPtr.hh

@@ -85,6 +85,8 @@ public:
 
     virtual void swap_elements(size_t _idx0, size_t _idx1);
 
+    virtual void copy(size_t _src_idx, size_t _dst_idx);
+
     const_iterator begin() const { return ptr::shared_ptr<PropT>::get()->begin(); }
     iterator begin() { return ptr::shared_ptr<PropT>::get()->begin(); }
 

src/OpenVolumeMesh/Core/PropertyPtrT.cc

@@ -88,6 +88,11 @@ void PropertyPtr<PropT,HandleT>::swap_elements(size_t _idx0, size_t _idx1) {
     ptr::shared_ptr<PropT>::get()->swap(_idx0, _idx1);
 }
 
+template <class PropT, class HandleT>
+void PropertyPtr<PropT,HandleT>::copy(size_t _src_idx, size_t _dst_idx) {
+    ptr::shared_ptr<PropT>::get()->copy(_src_idx, _dst_idx);
+}
+
 template <class PropT, class HandleT>
 void PropertyPtr<PropT,HandleT>::set_handle(const OpenVolumeMeshHandle& _handle) {
     return ptr::shared_ptr<PropT>::get()->set_handle(_handle);

src/Unittests/unittests_properties.cc

@@ -161,3 +161,12 @@ TEST_F(PolyhedralMeshBase, StatusTest) {
     StatusAttrib status(mesh_);
 }
 
+TEST_F(PolyhedralMeshBase, PropValueCopyTest) {
+
+    generatePolyhedralMesh(mesh_);
+    VertexPropertyT<int> prop = mesh_.request_vertex_property<int>();
+    prop[0] = 1234;
+    prop[1] = 2345;
+    prop.copy(0, 1);
+    EXPECT_EQ(prop[1], 1234);
+}