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small sfinae fix for in_place constructors

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This commit is contained in:
Andrzej Krzemienski
2016-11-02 22:28:20 +01:00
parent 4e08f0dd41
commit 9bc1cc585c
1 changed files with 3 additions and 1 deletions
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4
include/boost/optional/optional.hpp
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@ -727,7 +727,9 @@ class optional_base : public optional_tag
template <typename U> template <typename U>
struct is_optional_related struct is_optional_related
: boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value : boost::conditional< boost::is_base_of<optional_detail::optional_tag, BOOST_DEDUCED_TYPENAME boost::decay<U>::type>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value, || boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, none_t>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_t>::value
|| boost::is_same<BOOST_DEDUCED_TYPENAME boost::decay<U>::type, in_place_init_if_t>::value,
boost::true_type, boost::false_type>::type boost::true_type, boost::false_type>::type
{}; {};