swig/Examples/test-suite/li_boost_shared_ptr.i

// This tests shared_ptr is working okay. It also checks that there are no memory leaks in the
// class that shared_ptr is pointing via a counting mechanism in the constructors and destructor of Klass.
// In order to test that there are no leaks of the shared_ptr class itself (as it is created on the heap)
// the runtime tests can be run for a long time to monitor memory leaks using memory monitor tools 
// like 'top'. There is a wrapper for shared_ptr in shared_ptr_wrapper.h which enables one to
// count the instances of shared_ptr. Uncomment the SHARED_PTR_WRAPPER macro to turn this on.

%module li_boost_shared_ptr

%inline %{
#include "boost/shared_ptr.hpp"
#include "swig_examples_lock.h"

// Uncomment macro below to turn on shared_ptr memory leak checking as described above
//#define SHARED_PTR_WRAPPER

#ifdef SHARED_PTR_WRAPPER
# include "shared_ptr_wrapper.h"
#endif
%}

%{
#ifndef SHARED_PTR_WRAPPER
# define SwigBoost boost
#endif
%}

%include "std_string.i"
#ifndef SHARED_PTR_WRAPPER
# define SWIG_SHARED_PTR_NAMESPACE SwigBoost
#endif
%include "boost_shared_ptr.i"

SWIG_SHARED_PTR(Klass, Space::Klass)
SWIG_SHARED_PTR_DERIVED(KlassDerived, Space::Klass, Space::KlassDerived)

// TODO:
// const shared_ptr
// std::vector
// Add in generic %extend for the Upcast function for derived classes
// Can probably remove the pgcpp for shared_ptr, unless wrapping shared_ptr<>* shared_ptr<>& and use IntPtr instead of HandleRef for C# ???
// Remove proxy upcast method - implement %feature("shadow") ??? which replaces the proxy method

%exception {
  if (debug_shared) {
    cout << "++++++" << endl;
    cout << "calling $name" << endl;
  }
  $action
  if (debug_shared) {
    cout << "------" << endl;
  }
}

%ignore IgnoredMultipleInheritBase;
%ignore operator=;
%newobject pointerownertest();
%newobject smartpointerpointerownertest();

%inline %{
#include <iostream>
using namespace std;

static bool debug_shared = false;

namespace Space {

struct Klass {
  Klass() : value("EMPTY") { if (debug_shared) cout << "Klass() [" << value << "]" << endl; increment(); }

  Klass(const std::string &val) : value(val) { if (debug_shared) cout << "Klass(string) [" << value << "]" << endl; increment(); }

  virtual ~Klass() { if (debug_shared) cout << "~Klass() [" << value << "]" << endl; decrement(); }
  virtual std::string getValue() const { return value; }
  void append(const std::string &s) { value += s; }
  Klass(const Klass &other) : value(other.value) { if (debug_shared) cout << "Klass(const Klass&) [" << value << "]" << endl; increment(); }

  Klass &operator=(const Klass &other) { value = other.value; return *this; }
  static int getTotal_count() { return total_count; }

private:
  // lock increment and decrement as a destructor could be called at the same time as a 
  // new object is being created - C# / Java, at least, have finalizers run in a separate thread
  static SwigExamples::CriticalSection critical_section;
  static void increment() { SwigExamples::Lock lock(critical_section); total_count++; }
  static void decrement() { SwigExamples::Lock lock(critical_section); total_count--; }
  static int total_count;
  std::string value;
  int array[1024];
};
SwigExamples::CriticalSection Space::Klass::critical_section;

struct IgnoredMultipleInheritBase { virtual ~IgnoredMultipleInheritBase() {} double d; double e;};

// For most compilers, this use of multiple inheritance results in different derived and base class 
// pointer values ... for some more challenging tests :)
struct KlassDerived : IgnoredMultipleInheritBase, Klass {
  KlassDerived() : Klass() {}
  KlassDerived(const std::string &val) : Klass(val) {}
  virtual ~KlassDerived() {}
  virtual std::string getValue() const { return Klass::getValue() + "-Derived"; }
};
KlassDerived* derivedpointertest(KlassDerived* kd) {
  if (kd)
    kd->append(" derivedpointertest");
  return kd;
}


SwigBoost::shared_ptr<Klass> factorycreate() {
  return SwigBoost::shared_ptr<Klass>(new Klass("factorycreate"));
}
// smart pointer
SwigBoost::shared_ptr<Klass> smartpointertest(SwigBoost::shared_ptr<Klass> k) {
  if (k)
    k->append(" smartpointertest");
  return SwigBoost::shared_ptr<Klass>(k);
}
SwigBoost::shared_ptr<Klass>* smartpointerpointertest(SwigBoost::shared_ptr<Klass>* k) {
  if (k && *k)
    (*k)->append(" smartpointerpointertest");
  return k;
}
SwigBoost::shared_ptr<Klass>& smartpointerreftest(SwigBoost::shared_ptr<Klass>& k) {
  if (k)
    k->append(" smartpointerreftest");
  return k;
}
SwigBoost::shared_ptr<Klass>*& smartpointerpointerreftest(SwigBoost::shared_ptr<Klass>*& k) {
  if (k && *k)
    (*k)->append(" smartpointerpointerreftest");
  return k;
}
// const
SwigBoost::shared_ptr<const Klass> constsmartpointertest(SwigBoost::shared_ptr<const Klass> k) {
  return SwigBoost::shared_ptr<const Klass>(k);
}
SwigBoost::shared_ptr<const Klass>* constsmartpointerpointertest(SwigBoost::shared_ptr<const Klass>* k) {
  return k;
}
SwigBoost::shared_ptr<const Klass>& constsmartpointerreftest(SwigBoost::shared_ptr<const Klass>& k) {
  return k;
}
// plain pointer
Klass valuetest(Klass k) {
  k.append(" valuetest");
  return k;
}
Klass *pointertest(Klass *k) {
  if (k)
    k->append(" pointertest");
  return k;
}
Klass& reftest(Klass& k) {
  k.append(" reftest");
  return k;
}
Klass*& pointerreftest(Klass*& k) {
  k->append(" pointerreftest");
  return k;
}
// null
std::string nullsmartpointerpointertest(SwigBoost::shared_ptr<Klass>* k) {
  if (k && *k)
    return "not null";
  else if (!k)
    return "null smartpointer pointer";
  else if (!*k)
    return "null pointer";
}
// $owner
Klass *pointerownertest() {
  return new Klass("pointerownertest");
}
SwigBoost::shared_ptr<Klass>* smartpointerpointerownertest() {
  return new SwigBoost::shared_ptr<Klass>(new Klass("smartpointerpointerownertest"));
}
/*
Klass* arraytest(Klass k[]) {
  k[0].append(" arraytest");
  return k;
}
*/


long use_count(const SwigBoost::shared_ptr<Klass>& sptr) {
  return sptr.use_count();
}
const SwigBoost::shared_ptr<Klass>& ref_1() { 
  static SwigBoost::shared_ptr<Klass> sptr;
  return sptr;
}

} // namespace Space

%}
%{
  int Space::Klass::total_count = 0;
%}


// Member variables

%inline %{
struct MemberVariables {
  MemberVariables() : SmartMemberPointer(&SmartMemberValue), SmartMemberReference(SmartMemberValue), MemberPointer(0), MemberReference(MemberValue) {}
  SwigBoost::shared_ptr<Space::Klass> SmartMemberValue;
  SwigBoost::shared_ptr<Space::Klass> * SmartMemberPointer;
  SwigBoost::shared_ptr<Space::Klass> & SmartMemberReference;
  Space::Klass MemberValue;
  Space::Klass * MemberPointer;
  Space::Klass & MemberReference;
};
%}

// Note: %template after the shared_ptr typemaps
SWIG_SHARED_PTR(BaseIntDouble, Base<int, double>)
// Note: cannot use Base<int, double> in the macro below because of the comma in the type, 
// so we use a typedef instead. Alternatively use %arg(Base<int, double>). %arg is defined in swigmacros.swg.
SWIG_SHARED_PTR_DERIVED(PairIntDouble, BaseIntDouble_t, Pair<int, double>)

// Templates
%inline %{
template <class T1, class T2> struct Base {
  Space::Klass klassBase;
  T1 baseVal1;
  T2 baseVal2;
  Base(T1 t1, T2 t2) : baseVal1(t1*2), baseVal2(t2*2) {}
};
typedef Base<int, double> BaseIntDouble_t;
%}

%template(BaseIntDouble) Base<int, double>;

%inline %{
template <class T1, class T2> struct Pair : Base<T1, T2> {
  Space::Klass klassPair;
  T1 val1;
  T2 val2;
  Pair(T1 t1, T2 t2) : Base<T1, T2>(t1, t2), val1(t1), val2(t2) {}
};
%}

%template(PairIntDouble) Pair<int, double>;


// For counting the instances of shared_ptr (all of which are created on the heap)
// shared_ptr_wrapper_count() gives overall count
%inline %{
namespace SwigBoost {
  const int NOT_COUNTING = -123456;
  int shared_ptr_wrapper_count() { 
  #ifdef SHARED_PTR_WRAPPER
    return SwigBoost::SharedPtrWrapper::getTotalCount(); 
  #else
    return NOT_COUNTING;
  #endif
  }
  #ifdef SHARED_PTR_WRAPPER
  template<> std::string show_message(boost::shared_ptr<Space::Klass >*t) {
    if (!t)
      return "null shared_ptr!!!";
    if (boost::get_deleter<SWIG_null_deleter>(*t))
      return "Klass NULL DELETER"; // pointer may be dangling so cannot use it
    if (*t)
      return "Klass: " + (*t)->getValue();
    else
      return "Klass: NULL";
  }
  template<> std::string show_message(boost::shared_ptr<const Space::Klass >*t) {
    if (!t)
      return "null shared_ptr!!!";
    if (boost::get_deleter<SWIG_null_deleter>(*t))
      return "Klass NULL DELETER"; // pointer may be dangling so cannot use it
    if (*t)
      return "Klass: " + (*t)->getValue();
    else
      return "Klass: NULL";
  }
  template<> std::string show_message(boost::shared_ptr<Space::KlassDerived >*t) {
    if (!t)
      return "null shared_ptr!!!";
    if (boost::get_deleter<SWIG_null_deleter>(*t))
      return "KlassDerived NULL DELETER"; // pointer may be dangling so cannot use it
    if (*t)
      return "KlassDerived: " + (*t)->getValue();
    else
      return "KlassDerived: NULL";
  }
  #endif
}
%}