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Added error checking

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[SVN r12862]
This commit is contained in:
Dave Abrahams
2002-02-20 05:14:41 +00:00
parent 07abc9fac4
commit 47c1c6288c
1 changed files with 19 additions and 1 deletions
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20
include/boost/python/return_internal_reference.hpp
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@@ -9,14 +9,32 @@
# include <boost/python/default_call_policies.hpp>
# include <boost/python/reference_existing_object.hpp>
# include <boost/python/with_custodian_and_ward.hpp>
# include <boost/mpl/select_type.hpp>
namespace boost { namespace python {
namespace detail
{
template <std::size_t>
struct return_internal_reference_owner_arg_must_be_greater_than_zero
# if defined(__GNUC__) && __GNUC__ >= 3 || defined(__EDG__)
{}
# endif
;
}
template <std::size_t owner_arg = 1, class Base = default_call_policies>
struct return_internal_reference
: with_custodian_and_ward_postcall<0, owner_arg, Base>
{
typedef reference_existing_object result_converter;
private:
BOOST_STATIC_CONSTANT(bool, legal = owner_arg > 0);
public:
typedef typename mpl::select_type<
legal
, reference_existing_object
, detail::return_internal_reference_owner_arg_must_be_greater_than_zero<owner_arg>
>::type result_converter;
};
}} // namespace boost::python