Calling derived class method from base class destructor - c++

Question

I have the following snippet of destructor code in base class "SceneNode" that is trying to clear its member vector and delete vector's objects that are derived from SceneNode, but getting an error at Deleting child->toString line, can you please point at the right direction:
SceneNode::~SceneNode() {
LOG(DEBUG)<< "Node children size: " + to_string(children.size()) + " [" + toString() + "]";
// clean children nodes
for (SceneNode* child : children) {
LOG(DEBUG) << "Deleting ";
LOG(DEBUG) << "Deleting " + child->toString();
delete child;
LOG(DEBUG) << "Deleted " + child->toString();
}
When I debug, it shows me a correct derived object there:
Name : child
Details:0x3204b40
Default:0x3204b40
Decimal:52448064
Hex:0x3204b40
Binary:11001000000100101101000000
Octal:0310045500
Name : lib::SceneNode
Details:{_vptr.SceneNode = 0x4e3430 <vtable for lib::ImageSceneNode+16>, id = {static npos = <optimized out>, _M_dataplus = {<std::allocator<char>> = {<__gnu_cxx::new_allocator<char>> = {<No data fields>}, <No data fields>}, _M_p = 0x3204c08 "New Node"}}, position = {x = 0, y = 0}, size = {x = 1920, y = 1080}, center = {x = 960, y = 540}, rotation = 0, alpha = 255, enabled = true, visible = true, deleted = false, parent = 0x22fca0, children = {<std::_Vector_base<lib::SceneNode*, std::allocator<lib::SceneNode*> >> = {_M_impl = {<std::allocator<lib::SceneNode*>> = {<__gnu_cxx::new_allocator<lib::SceneNode*>> = {<No data fields>}, <No data fields>}, _M_start = 0x0, _M_finish = 0x0, _M_end_of_storage = 0x0}}, <No data fields>}, animators = {<std::_Vector_base<lib::NodeAnimator*, std::allocator<lib::NodeAnimator*> >> = {_M_impl = {<std::allocator<lib::NodeAnimator*>> = {<__gnu_cxx::new_allocator<lib::NodeAnimator*>> = {<No data fields>}, <No data fields>}, _M_start = 0x0, _M_finish = 0x0, _M_end_of_storage = 0x0}}, <No data fields>}, sceneManager = 0x22fc98}
Default:{...}
Decimal:{...}
Hex:{...}
Binary:{...}
Octal:{...}
Log:
2015-03-09 15:33:39,685 DEBUG [default] [] [virtual lib::SceneNode::~SceneNode()] [..\src\lib\scene\node\SceneNode.cpp:30] Node children size: 1 [SceneNode]
2015-03-09 15:33:39,685 DEBUG [default] [] [virtual lib::SceneNode::~SceneNode()] [..\src\lib\scene\node\SceneNode.cpp:34] Deleting
2015-03-09 15:33:39,685 FATAL [default] CRASH HANDLED; Application has crashed due to [SIGSEGV] signal
Thank you!

Answer 1

First change this:
LOG(DEBUG) << "Deleting " + child->toString();
to this:
LOG(DEBUG) << "Deleting " << child->toString();
Then remove this line, as at this point that variable has been destroyed and you cannot access it (this is the cause of the crash):
LOG(DEBUG) << "Deleted " + child->toString();