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// file : examples/mm/transfer/transfer.cxx
// author : Boris Kolpackov <boris@kolpackov.net>
// copyright : Copyright (c) 2005-2010 Boris Kolpackov
// license : GNU GPL v2 + exceptions; see accompanying LICENSE file
#include <cult/mm/evptr.hxx>
#include <iostream>
using std::cerr;
using std::endl;
using namespace Cult;
unsigned long count = 0;
unsigned long clone_count = 0;
struct Type
{
Type ()
{
++count;
}
~Type ()
{
--count;
}
Evptr<Type>
clone () const
{
++clone_count;
return Evptr<Type> (new Type);
}
Void
f () const
{
Int i = i_;
++i;
}
Int i_;
};
Evptr<Type>
source ()
{
return Evptr<Type> (new Type);
}
Void
sink (Evptr<Type> a, Boolean r = true)
{
if (r)
{
sink (a, false);
}
else
{
Evptr<Type> b (a);
cerr << "\tshare count: " << b.count () << endl;
// Any of these will trigger cloning.
//
b->f ();
}
}
Int
main ()
{
// case 1
//
{
cerr << "sink (new type)" << endl;
clone_count = 0;
sink (new Type);
cerr << "\tclone count: " << clone_count << endl
<< endl;
}
// case 2
//
{
cerr << "sink (source ())" << endl;
clone_count = 0;
sink (source ());
cerr << "\tclone count: " << clone_count << endl
<< endl;
}
// case 3
//
{
cerr << "sink (p)" << endl;
clone_count = 0;
Evptr<Type> p (new Type);
sink (p);
cerr << "\tclone count: " << clone_count << endl
<< endl;
}
cerr << "balance: " << count << endl;
}
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