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cppbind::Ghost: improve compiler error message for wrong usage.

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This commit is contained in:
Thomas Geymayer 2014-06-04 17:46:35 +02:00
parent 4931ce0364
commit e5acc3f048
1 changed files with 24 additions and 5 deletions
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29
simgear/nasal/cppbind/Ghost.hxx
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@ -201,6 +201,20 @@ namespace nasal
typedef SGSharedPtr<internal::MethodHolder> MethodHolderPtr;
typedef SGWeakPtr<internal::MethodHolder> MethodHolderWeakPtr;
// Dummy template to create shorter and easy to understand compile errors if
// trying to wrap the wrong type as a Ghost.
template<class T, class Enable = void>
class Ghost
{
public:
BOOST_STATIC_ASSERT(("Ghost can only wrap shared pointer!"
&& is_strong_ref<T>::value
));
static Ghost& init(const std::string& name);
static bool isInit();
};
/**
* Class for exposing C++ objects to Nasal
*
@ -241,11 +255,11 @@ namespace nasal
* @endcode
*/
template<class T>
class Ghost:
class Ghost<T, typename boost::enable_if<is_strong_ref<T> >::type>:
public internal::GhostMetadata
{
// Shared pointer required for Ghost (no weak pointer!)
BOOST_STATIC_ASSERT((shared_ptr_traits<T>::is_strong::value));
BOOST_STATIC_ASSERT((is_strong_ref<T>::value));
public:
typedef typename T::element_type raw_type;
@ -871,7 +885,7 @@ namespace nasal
private:
template<class>
template<class, class>
friend class Ghost;
static naGhostType _ghost_type_strong, //!< Stored as shared pointer
@ -1283,9 +1297,14 @@ namespace nasal
};
template<class T>
naGhostType Ghost<T>::_ghost_type_strong;
naGhostType
Ghost<T, typename boost::enable_if<is_strong_ref<T> >::type>
::_ghost_type_strong;
template<class T>
naGhostType Ghost<T>::_ghost_type_weak;
naGhostType
Ghost<T, typename boost::enable_if<is_strong_ref<T> >::type>
::_ghost_type_weak;
} // namespace nasal