c++ unordered_map of unordered_map to perl

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Hi.
I am  new user to swig.
My example is from  c++ to perl.

I have managed to get  a std:vector of std::string  returned from  c++ to perl ,
and next up I am attempting to get a std::unordered_map  of unordered_map of unordered_map   of  std::strings     returned.

On searching for various answers to questions about this I learnt that support for unordered_map  has been added 'recently'
(wsfulton  on Aug 31, 2018  said. swig-3.0.12 does not have support for std::unordered_map, but swig-4.0.0 will. )

I was previously using swig  2.0.10
and so have just downloaded and installed 4.0.2   which I am now attempting to use.

My first issue was that although I could see the std_unordered_map.i   file  in   share/swig/4.0.2/std
I kept getting messages about the file not being found.
Finally I discovered the  -I    argument to include in the command line.
Which I then used as

  swig  =c++ =perl -I/path/to/swigInstall/share/swig/4.0.2/std    myFile.i


  myFile.i    contains


%module myFile
%{
   #include "myFile.h"
   #include <unordered_map>
%}

using namespace std;
%include <std_string.i>
%include <std_vector.i>
%include <std_unordered_map.i>

And I had created some templates like...
namespace std {
  %template(StdStrVector) vector<std::string>;

   %template(StdStrUnOrdMap)    unordered_map<std::string,std::string>;
   %template(StdStrUnOrdMapL2)  unordered_map<std::string,StdStrUnOrdMap>;
   %template(StdStrUnOrdMapL3)  unordered_map<std::string,StdStrUnOrdMapL2>;

}


Now I managed to get the .i to create the wrap.cxx file and .pm file   (In other words,  swig now runs to completion.. )
But in attempting to compile the wrap  cxx file I get many issues with

usr/bin/g++ -fpic -std=c++11 -O2 -g -Wall -c  -I/tools/iccad/.packages/x86_64/RHEL7.2/perl/5.20.2-20210630/lib/5.20.2/x86_64-linux-thread-multi-ld/CORE mfile_wrap.cxx -o myfile_wrap.o

GVConnectivity_cc_wrap.cxx:1721:25: error: 'traits' is not a class template
     template <>  struct traits< char > {
                         ^
GVConnectivity_cc_wrap.cxx:1721:40: error: explicit specialization of non-template 'swig::traits'
     template <>  struct traits< char > {
                                        ^
GVConnectivity_cc_wrap.cxx:1722:15: error: 'pointer_category' does not name a type
       typedef pointer_category category;
               ^
GVConnectivity_cc_wrap.cxx:2148:25: error: 'traits' is not a class template
     template <>  struct traits< Verific::Net > {
                         ^
GVConnectivity_cc_wrap.cxx:2148:46: error: 'swig::traits' is not a template type
     template <>  struct traits< Verific::Net > {
                                              ^
GVConnectivity_cc_wrap.cxx:2156:22: error: 'traits' is not a class template
  template <>  struct traits<std::vector< Verific::Net*, std::allocator< Verific::Net * > > > {

etc...


in searching through the .i files in  share/swig/4.0.2/std     I seem to need   std_common.i  as well..
but that doesn't seem to help
In fact,  the swig run gives a bunch of warnings about traits... so its probably not surprising I get compile issues with it

/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/bin/swig -c++ -perl -I/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std myfile.i

/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_basic_string.i:45: Warning 490: Fragment 'StdTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_vector.i:135: Warning 490: Fragment 'StdTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_vector.i:135: Warning 490: Fragment 'StdVectorTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_vector.i:94: Warning 490: Fragment 'StdTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_vector.i:94: Warning 490: Fragment 'StdVectorTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_unordered_map.i:119: Warning 490: Fragment 'StdPairTraits' not found.
/tools/iccad/.packages/x86_64/RHEL6.8/swig/4.0.2/share/swig/4.0.2/std/std_unordered_map.i:119: Warning 490: Fragment 'StdUnorderedMapTraits' not found.


Finally on a whim I found  the share/swig/4.0.2/typemaps/   fragments.swg  and implicit.swg  that seemed to have fragment stuff in..
of course, that didn't help either

so any help would be appreciated in getting my wrap file to compile.
Thanks in advance
Richard Duce

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