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Explicitly disable move constructor when needed

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This commit is contained in:
Peter Dimov
2020-01-22 18:30:36 +02:00
parent 17bc06b090
commit 4f81882bfd
1 changed files with 24 additions and 5 deletions
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29
include/boost/variant2/variant.hpp
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@ -1238,9 +1238,28 @@ public:
} // namespace detail } // namespace detail
// disable_move_constructor
namespace detail
{
template<bool MoveConstructible> struct disable_move_constructor;
template<> struct disable_move_constructor<true>
{
};
template<> struct disable_move_constructor<false>
{
disable_move_constructor() = default;
disable_move_constructor( disable_move_constructor && ) = delete;
};
} // namespace detail
// variant // variant
template<class... T> class variant: private detail::variant_copy_base<T...> template<class... T> class variant: private detail::variant_copy_base<T...>, private detail::disable_move_constructor<mp11::mp_all<std::is_move_constructible<T>...>::value>
{ {
private: private:
@ -1259,8 +1278,8 @@ public:
#if !BOOST_WORKAROUND( BOOST_MSVC, < 1910 ) #if !BOOST_WORKAROUND( BOOST_MSVC, < 1910 )
variant( variant const& ) = default; // variant( variant const& ) = default;
variant( variant && ) = default; // variant( variant && ) = default;
#else #else
@ -1314,8 +1333,8 @@ public:
#if !BOOST_WORKAROUND( BOOST_MSVC, < 1910 ) #if !BOOST_WORKAROUND( BOOST_MSVC, < 1910 )
variant& operator=( variant const& ) = default; // variant& operator=( variant const& ) = default;
variant& operator=( variant && ) = default; // variant& operator=( variant && ) = default;
#else #else