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//
// esft_constructor_test.cpp
//
// A test for the new enable_shared_from_this support for calling
// shared_from_this from constructors (that is, prior to the
// object's ownership being passed to an external shared_ptr).
//
// Copyright (c) 2008 Frank Mori Hess
// Copyright (c) 2008 Peter Dimov
//
// Distributed under the Boost Software License, Version 1.0.
//
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
//
#include <boost/smart_ptr/enable_shared_from_this2.hpp>
#include <boost/shared_ptr.hpp>
#include <boost/weak_ptr.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <memory>
class X: public boost::enable_shared_from_this2< X >
{
private:
int destroyed_;
int deleted_;
int expected_;
private:
X( X const& );
X& operator=( X const& );
public:
static int instances;
public:
explicit X( int expected, boost::shared_ptr<X> *early_px = 0 ): destroyed_( 0 ), deleted_( 0 ), expected_( expected )
{
++instances;
if( early_px ) *early_px = shared_from_this();
}
~X()
{
BOOST_TEST( deleted_ == expected_ );
BOOST_TEST( destroyed_ == 0 );
++destroyed_;
--instances;
}
typedef void (*deleter_type)( X* );
static void deleter( X * px )
{
++px->deleted_;
}
static void deleter2( X * px )
{
++px->deleted_;
delete px;
}
};
int X::instances = 0;
template<typename T, typename U>
bool are_shared_owners(const boost::shared_ptr<T> &a, const boost::shared_ptr<U> &b)
{
return !(a < b) && !(b < a);
}
struct Y: public boost::enable_shared_from_this2<Y>
{};
int main()
{
BOOST_TEST( X::instances == 0 );
{
boost::shared_ptr<X> early_px;
X* x = new X( 1, &early_px );
BOOST_TEST( early_px.use_count() > 0 );
BOOST_TEST( boost::get_deleter<X::deleter_type>(early_px) == 0 );
boost::shared_ptr<X> px( x, &X::deleter2 );
BOOST_TEST( early_px.use_count() == 2 && px.use_count() == 2 );
BOOST_TEST(are_shared_owners(early_px, px));
px.reset();
BOOST_TEST( early_px.use_count() == 1 );
BOOST_TEST( X::instances == 1 );
// X::deleter_type *pd = boost::get_deleter<X::deleter_type>(early_px);
// BOOST_TEST(pd && *pd == &X::deleter2 );
}
BOOST_TEST( X::instances == 0 );
{
boost::shared_ptr<X> early_px;
X* x = new X( 1, &early_px );
boost::weak_ptr<X> early_weak_px = early_px;
early_px.reset();
BOOST_TEST( !early_weak_px.expired() );
boost::shared_ptr<X> px( x, &X::deleter2 );
BOOST_TEST( px.use_count() == 1 );
BOOST_TEST( X::instances == 1 );
BOOST_TEST(are_shared_owners(early_weak_px.lock(), px));
px.reset();
BOOST_TEST( early_weak_px.expired() );
}
BOOST_TEST( X::instances == 0 );
{
boost::shared_ptr<X> early_px;
X x( 1, &early_px );
BOOST_TEST( early_px.use_count() > 0 );
boost::shared_ptr<X> px( &x, &X::deleter );
BOOST_TEST( early_px.use_count() == 2 && px.use_count() == 2 );
early_px.reset();
BOOST_TEST( px.use_count() == 1 );
BOOST_TEST( X::instances == 1 );
px.reset();
try
{
x.shared_from_this();
BOOST_ERROR("x did not throw bad_weak_ptr");
}
catch( const boost::bad_weak_ptr & )
{}
}
BOOST_TEST( X::instances == 0 );
{
boost::weak_ptr<X> early_weak_px;
{
boost::shared_ptr<X> early_px;
X x( 0, &early_px );
early_weak_px = early_px;
early_px.reset();
BOOST_TEST( !early_weak_px.expired() );
BOOST_TEST( X::instances == 1 );
}
BOOST_TEST( early_weak_px.expired() );
}
BOOST_TEST( X::instances == 0 );
{
boost::shared_ptr<Y> px(new Y());
Y y(*px);
px.reset();
try
{
y.shared_from_this();
}
catch( const boost::bad_weak_ptr & )
{
BOOST_ERROR("y threw bad_weak_ptr");
}
}
return boost::report_errors();
}
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