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binding to rvalues can be reenabled with a macro

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This commit is contained in:
Andrzej Krzemienski
2014-05-13 14:11:17 +02:00
parent 1c9775a9d9
commit e9f5ed41be
1 changed files with 3 additions and 1 deletions
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4
include/boost/optional/optional.hpp
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@ -175,9 +175,11 @@ struct types_when_is_ref
template <class To, class From>
void prevent_binding_rvalue_ref_to_optional_lvalue_ref()
{
#ifndef BOOST_OPTIONAL_ALLOW_BINDING_TO_RVALUES
BOOST_STATIC_ASSERT_MSG(
!boost::is_lvalue_reference<To>::value || !boost::is_rvalue_reference<From>::value,
"binding rvalue references to optional lvalue references is disallowed");
"binding rvalue references to optional lvalue references is disallowed");
#endif
}
struct optional_tag {} ;