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Check in SFINAE base class for use in optional/variant

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git-svn-id: https://llvm.org/svn/llvm-project/libcxx/trunk@278643 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Eric Fiselier
2016-08-15 01:51:54 +00:00
parent c9e74ddb6c
commit b901c3475e
1 changed files with 57 additions and 0 deletions
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57
include/__tuple
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@@ -479,6 +479,63 @@ struct _LIBCPP_TYPE_VIS __check_tuple_constructor_fail {
};
#endif
#if _LIBCPP_STD_VER > 14
template <bool _CanCopy, bool _CanMove>
struct __sfinae_ctor_base {};
template <>
struct __sfinae_ctor_base<false, false> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <>
struct __sfinae_ctor_base<true, false> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base(__sfinae_ctor_base &&) = delete;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <>
struct __sfinae_ctor_base<false, true> {
__sfinae_ctor_base() = default;
__sfinae_ctor_base(__sfinae_ctor_base const&) = delete;
__sfinae_ctor_base(__sfinae_ctor_base &&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base const&) = default;
__sfinae_ctor_base& operator=(__sfinae_ctor_base&&) = default;
};
template <bool _CanCopy, bool _CanMove>
struct __sfinae_assign_base {};
template <>
struct __sfinae_assign_base<false, false> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
};
template <>
struct __sfinae_assign_base<true, false> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = delete;
};
template <>
struct __sfinae_assign_base<false, true> {
__sfinae_assign_base() = default;
__sfinae_assign_base(__sfinae_assign_base const&) = default;
__sfinae_assign_base(__sfinae_assign_base &&) = default;
__sfinae_assign_base& operator=(__sfinae_assign_base const&) = delete;
__sfinae_assign_base& operator=(__sfinae_assign_base&&) = default;
};
#endif // _LIBCPP_STD_VER > 14
_LIBCPP_END_NAMESPACE_STD
#endif // _LIBCPP___TUPLE