Migrating C++ code from gcc 2.96 yo 3.4.4

[shiraz]

Hi,

I'm in the process of porting some C++ code written for a linux environment from gcc version 2.96 yo 3.4.3.

Unfortunately, I got stuck when it came to porting some STL map related code. I did some research but I can't seem to find the modification required to overcome the problem.

In the header file I've got the following map defined:

// Map of Port Description -> PortInfo*
typedef map<Description, PortInfo*, less<Description> > PortDescriptionsMap;

typedef PortDescriptionsMap::iterator PortDescriptionsMapIterator;
typedef PortDescriptionsMap::value_type PortDescriptionsMapValue;
typedef pair<PortDescriptionsMapIterator, bool > DescriptionsInsertResult;
PortDescriptionsMap portDescriptionsMap;

where:
'Description' is a class representing an array of characters and
'PortInfo' is another class

When I compile the following code segment I get an error, which is associated to the last line in the code segment:


if (portNumbersMap.size() > 0)
{
PortNumbersMapIterator iterator = portNumbersMap.begin();

==>> if(iterator != portDescriptionsMap.end())



ports.cpp:479: error: no match for 'operator!=' in 'iterator != (((std::map<Description, PortInfo*, std::less<Description>, std::allocator<std::pair<const Description, PortInfo*> > >*)((Ports*)this)) + 84u)->std::map<_Key, _Tp, _Compare, _Alloc>::end [with _Key = Description, _Tp = PortInfo*, _Compare = std::less<Description>, _Alloc = std::allocator<std::pair<const Description, PortInfo*> >]()'
/usr/lib/gcc/i386-redhat-linux/3.4.3/../../../../include/c++/3.4.3/bits/stl_tree.h:213: note: candidates are: bool std::_Rb_tree_iterator<_Tp>::operator!=(const std::_Rb_tree_iterator<_Tp>&) const [with _Tp = std::pair<const PortNumber, Description>]
__________________________________________________

The compile error refers to templates. I expect they are implicitly used in maps. I also realise that 'typename' needs to be used when we've got templates. However, if I add it to the header file as follows

typedef typename PortDescriptionsMap::iterator PortDescriptionsMapIterator;

or in the code itself

typename PortNumbersMapIterator iterator = portNumbersMap.begin();

I get 'typename' used outside template error.

I would greatly appreciate any suggestions from others in the community.

Thanks in advance,
Shiraz
Melbourne, Australia

[Banfa]

The error is telling you the problem

no match for 'operator!=' in 'iterator != <snipped for clarity>'

It is saying that in the line of code

if(iterator != portDescriptionsMap.end())

If can find no defined operator for != for the types in the comparison.

You need to define the operator for this line of code to work.

Unfortunately it is late and I am having trouble divining the correct syntax for this operator to give you.