error: no match for operator= in map c++ - c++

Question

im trying to import data from an XML file and save them in a 5D map
// declaration of the map
map<char *, map<char *, map<char*, map<char *, map<char*, map<char*, char*, cmp_str>, cmp_str>, cmp_str>, cmp_str>, cmp_str>, cmp_str> XmlData;
im using for the XML-Parsing the RapidXML Parser
file<> xmlFile("jobs.xml");
xml_document<> doc;
doc.parse<0>(xmlFile.data());
xml_node<> *node = doc.first_node();
while(node != 0) {
xml_node<> *child = node->first_node();
while (child != 0)
{
xml_node<> *subchild = child->first_node();
while (subchild != 0)
{
xml_node<> *subsubchild = subchild->first_node();
while (subsubchild != 0)
{
xml_node<> *subsubsubchild = subchild->first_node();
while (subsubsubchild != 0)
{
// the error appears here
XmlData[node->name()][child->name()][subchild->name()][subsubchild->name()][subsubsubchild->name()] = subsubsubchild->value();
subsubsubchild = subsubsubchild->next_sibling();
}
subsubchild = subsubchild->next_sibling();
}
subchild = subchild->next_sibling();
}
child = child->next_sibling();
}
node = node->next_sibling();
}
I had to use 5 while loops to iterate all nodes
XML :
<Job>
<UserJob>
<RuleSet>
<def>
<Path>detection_c_new.dcp</Path>
<WkspName>MyWS</WkspName>
<UserName>Admin</UserName>
</def>
</RuleSet>
</UserJob>
<Scenes>
<Scene1>
<Info>
<def>
<ID>0</ID>
<Name>Scene 1</Name>
</def>
</Info>
<Layers>
<Layer1>
<Index>0</Index>
<Name>Layer 1</Name>
<ImgPath>CTX_MEM_Detail.jpg</ImgPath>
</Layer1>
</Layers>
<ExpItems>
<ExpItem1>
<Name>MyStats1</Name>
<Driver>CSV</Driver>
<Type>1</Type>
<Path>CTX_MEM_Detail.csv</Path>
</ExpItem1>
</ExpItems>
</Scene1>
</Scenes>
</Job>
When compiling using g++ with c++0x under CentOS 6 i get this following error:
Job.cpp:133: error: no match for âoperator=â in â((std::map<char*, std::map<char*, char*, cmp_str, std::allocator<std::pair<char* const, char*> > >, cmp_str, std::all$
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:251: note: candidates are: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compa$
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:266: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compa$
/usr/lib/gcc/x86_64-redhat-linux/4.4.7/../../../../include/c++/4.4.7/bits/stl_map.h:286: note: std::map<_Key, _Tp, _Compare, _Alloc>& std::map<_Key, _Tp, _Compa$

Answer 1

char* is an awful thing to have as map key, and probably value too.
You might use const char* as key is absolutely sure that you pass pointers to stable things, like literal only.
The baseline soulution would use string as both key and payload, and I guess your problem would go away too. The most probable immediate cause is that your value refuses to convert to char*.