map not initialised properly, Pnode is null

[Dave Curtis]

I have this code:

std::map<string,fType> FileMap::fTypeMap;

void FileMap::setTypes()
{

// project file
fTypeMap["FIDX"] = FIDX;

// etc

}

(fType is an enum)

This line crashes at runtime with an exception. If I step through the insert call I encounter the following:

mapped_type& operator[](key_type&& _Keyval)
{ // find element matching _Keyval or insert with default mapped
iterator _Where = this->lower_bound(_Keyval);

iterator lower_bound(const key_type& _Keyval)
{ // find leftmost node not less than _Keyval in mutable tree
return (iterator(_Lbound(_Keyval), this));
}

_Nodeptr _Lbound(const key_type& _Keyval)
{ // find leftmost node not less than _Keyval
_Nodeptr _Pnode = _Root();
_Nodeptr _Wherenode = this->_Myhead; // end() if search fails


_Nodeptr& _Root() const
{ // return root of nonmutable tree
return (this->_Parent(this->_Myhead));
}

This returns 0.

I don't understand this. The tree for the map seems not to have been set up. I don't see any tests to see whether the tree needs to be initialised.

This seems like a simple insertion. Why doesn't it work? Is it anything to do with the fact that the declaration is static and some constructor has not been called?

I'm baffled.

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