use Devel::Peek;

my $obj1 = Soldier->new('Benjamin', 'Private', 11111);
my $obj2 = Soldier->new('Sanders', 'Colonel', 22222);
my $obj3 = Soldier->new('Matt', 'Sergeant', 33333);
    
for my $obj ($obj1, $obj2, $obj3) {
    print ($obj->get_serial, ") ", 
           $obj->get_name, " is a ", 
           $obj->get_rank, "\n");
} 

Dump($obj1);
print "\n";
 
package Soldier;
    
use Inline C => <<'END';
    
typedef struct {
  char* name;
  char* rank;
  long  serial;
  } Soldier;
 

   
SV* new(char* class, char* name, char* rank, long serial) {
    Soldier* soldier;
    New(42, soldier, 1, Soldier);
    SV*      obj_ref = newSViv(0);
    SV*      obj = newSVrv(obj_ref, class);

    soldier->name = savepv(name);
    soldier->rank = savepv(rank);
    soldier->serial = serial;
        
    sv_setiv(obj, (IV)soldier);
    SvREADONLY_on(obj);
    return obj_ref;
}
    
char* get_name(SV* obj) {
      return ((Soldier*)SvIV(SvRV(obj)))->name;
}
    
char* get_rank(SV* obj) {
      return ((Soldier*)SvIV(SvRV(obj)))->rank;
}
    
long get_serial(SV* obj) {
     return ((Soldier*)SvIV(SvRV(obj)))->serial;
}

void DESTROY(SV* obj) {
     Soldier* soldier = (Soldier*)SvIV(SvRV(obj));
     Safefree(soldier->name);
     Safefree(soldier->rank);
     Safefree(soldier);
}

END

__END__
Outputs:
11111) Benjamin is a Private
22222) Sanders is a Colonel
33333) Matt is a Sergeant
SV = PVIV(0x2f5b8c) at 0x2f4940
  REFCNT = 1
  FLAGS = (PADBUSY,PADMY,ROK)
  IV = 0
  RV = 0x2f3ca4
  SV = PVMG(0x2febbc) at 0x2f3ca4
    REFCNT = 1
    FLAGS = (OBJECT,IOK,READONLY,pIOK)
    IV = 3143860
    NV = 0
    PV = 0
    STASH = 0x45fca8    "Soldier"
  PV = 0x2f3ca4 ""
  CUR = 0
  LEN = 0

##</code><code>##

SV* new(char* class, char* name, char* rank, long serial) {
    Soldier* soldier;
    New(42, soldier, 1, Soldier);

    soldier->name = savepv(name);
    soldier->rank = savepv(rank);
    soldier->serial = serial;

    return sv_setref_pv(newSViv(0), class, (void *)soldier);

}

##</code><code>##

SV* new(char* class, char* name, char* rank, long serial) {
    Soldier* soldier;
    SV *ret, *temp = newSViv(0);
    New(42, soldier, 1, Soldier);

    soldier->name = savepv(name);
    soldier->rank = savepv(rank);
    soldier->serial = serial;

    ret = sv_setref_pv(temp, class, (void *)soldier);

    SvREADONLY_on(temp);
    SvREADONLY_on(ret);

    return ret;
}