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Make null unique_ptr convert to empty shared_ptr

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This commit is contained in:
Peter Dimov
2017-06-13 05:50:40 +03:00
parent 52d976fde2
commit 1d314c5668
3 changed files with 130 additions and 11 deletions
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test/sp_unique_ptr_test.cpp
+57 -2
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@@ -11,6 +11,7 @@
#include <boost/shared_ptr.hpp>
#include <boost/enable_shared_from_this.hpp>
#include <boost/detail/lightweight_test.hpp>
#include <boost/type_traits/remove_reference.hpp>
#include <memory>
#include <utility>
@@ -67,11 +68,42 @@ struct YD
{
void operator()( Y* p ) const
{
p->deleted_ = true;
delete p;
if( p )
{
p->deleted_ = true;
delete p;
}
else
{
BOOST_ERROR( "YD::operator()(0) called" );
}
}
};
template<class U, class T, class D> static void test_null_unique_ptr( std::unique_ptr<T, D> p1, std::unique_ptr<T, D> p2 )
{
BOOST_TEST( T::instances == 0 );
boost::shared_ptr<U> sp( std::move( p1 ) );
BOOST_TEST( sp.get() == 0 );
BOOST_TEST( sp.use_count() == 0 );
sp.reset( new T, typename boost::remove_reference<D>::type() );
BOOST_TEST( sp.get() != 0 );
BOOST_TEST( sp.use_count() == 1 );
BOOST_TEST( T::instances == 1 );
sp = std::move( p2 );
BOOST_TEST( sp.get() == 0 );
BOOST_TEST( sp.use_count() == 0 );
BOOST_TEST( T::instances == 0 );
}
int main()
{
{
@@ -226,6 +258,29 @@ int main()
BOOST_TEST( Y::instances == 0 );
}
{
test_null_unique_ptr<X>( std::unique_ptr<X>(), std::unique_ptr<X>() );
test_null_unique_ptr<X const>( std::unique_ptr<X>(), std::unique_ptr<X>() );
test_null_unique_ptr<void>( std::unique_ptr<X>(), std::unique_ptr<X>() );
test_null_unique_ptr<void const>( std::unique_ptr<X>(), std::unique_ptr<X>() );
}
{
test_null_unique_ptr<Y>( std::unique_ptr<Y, YD>( 0, YD() ), std::unique_ptr<Y, YD>( 0, YD() ) );
test_null_unique_ptr<Y const>( std::unique_ptr<Y, YD>( 0, YD() ), std::unique_ptr<Y, YD>( 0, YD() ) );
test_null_unique_ptr<void>( std::unique_ptr<Y, YD>( 0, YD() ), std::unique_ptr<Y, YD>( 0, YD() ) );
test_null_unique_ptr<void const>( std::unique_ptr<Y, YD>( 0, YD() ), std::unique_ptr<Y, YD>( 0, YD() ) );
}
{
YD yd;
test_null_unique_ptr<Y>( std::unique_ptr<Y, YD&>( 0, yd ), std::unique_ptr<Y, YD&>( 0, yd ) );
test_null_unique_ptr<Y const>( std::unique_ptr<Y, YD&>( 0, yd ), std::unique_ptr<Y, YD&>( 0, yd ) );
test_null_unique_ptr<void>( std::unique_ptr<Y, YD&>( 0, yd ), std::unique_ptr<Y, YD&>( 0, yd ) );
test_null_unique_ptr<void const>( std::unique_ptr<Y, YD&>( 0, yd ), std::unique_ptr<Y, YD&>( 0, yd ) );
}
return boost::report_errors();
}