下面是一个示例，说明如何将%typemap用于嵌套的std::map。

• • 新的交易i**：

%module new_tr
%typemap(out) std::map<int, std::map<std::string,std::string>> {
    HV *hash = (HV *) newHV();
    for (auto const& item : $1) {
        HV *subhash;
        char *keysv;
        auto map = item.second;
        subhash = (HV *) newHV();
        for (auto const &item2 : map) {
            SV *sv;
            auto key2 = item2.first.c_str();
            auto value = item2.second.c_str();
            sv = newSVpvn( value, strlen(value) );
            hv_store (subhash, key2, strlen(key2), sv, 0);
        }
        auto key = std::to_string(item.first).c_str();
        hv_store (hash, key, strlen(key), (SV*) newRV_noinc((SV*)subhash), 0);
    }  
    $result = newRV_noinc((SV*) hash);
    sv_2mortal($result);
    argvi++;
} 
%{
#include "new_tr.h"
%}
%include "new_tr.h"

• • 新_交易. h**：

#include <map>
#include <string>
using ssmap = std::map<int,  std::map<std::string,std::string>>;
ssmap getResult();

• • 新的交易cxx**：

#include "new_tr.h"

ssmap getResult()
{
    ssmap map = {
        {1, {{"Brown","Manager"}, {"Smith", "Salesman"}, {"Albert", "Salesman"}}},
        {2, {{"Penfold", "Designer"}, {"Evans", "Tea-person"}, {"Jurgens", "Manager"}}}
    };

    return map;
}

然后使用以下命令编译模块：

perl_include_dir=$(perl -MConfig -e'print $Config{archlib}')"/CORE"
swig -perl5 -c++ -I/usr/include new_tr.i 
g++ -fPIC -c new_tr.cxx
g++ -I${perl_include_dir} -c -fPIC -g -o new_tr_wrap.o new_tr_wrap.cxx
g++ -shared -L. new_tr.o new_tr_wrap.o -o new_tr.so

并使用test.pl对其进行测试：

use strict;
use warnings;
use Data::Dumper;
use lib '.';
use new_tr;

my $map = new_tr::getResult();
print Dumper( $map );

• • 输出**：

$VAR1 = {
          '1' => {
                   'Albert' => 'Salesman',
                   'Smith' => 'Salesman',
                   'Brown' => 'Manager'
                 },
          '2' => {
                   'Penfold' => 'Designer',
                   'Jurgens' => 'Manager',
                   'Evans' => 'Tea-person'
                 }
        };