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Fixes #35 ('New nothrow move traits are incomplete')

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Ion Gaztañaga
2020-12-30 00:05:29 +01:00
parent 4a60a8eb06
commit a24923b8a4
1 changed files with 100 additions and 5 deletions
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105
include/boost/move/detail/type_traits.hpp
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@ -65,7 +65,7 @@
// BOOST_MOVE_HAS_NOTHROW_COPY(T) should evaluate to true if T(t) can not throw
// BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) should evaluate to true if t = u can not throw
// BOOST_MOVE_IS_ENUM(T) should evaluate to true it t is a union type.
// BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCT(T) should evaluate to true if T has a non-throwing move constructor.
// BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) should evaluate to true if T has a non-throwing move constructor.
// BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T) should evaluate to true if T has a non-throwing move assignment operator.
//
// The following can also be defined: when detected our implementation is greatly simplified.
@ -106,13 +106,15 @@
# endif
# if _MSC_FULL_VER >= 180020827
# define BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T) (__is_nothrow_assignable(T&, T&&))
# define BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCT(T) (__is_nothrow_constructible(T, T&&))
# define BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) (__is_nothrow_constructible(T, T&&))
# endif
#endif
#if defined(BOOST_CLANG)
// BOOST_MOVE_HAS_TRAIT
# ifdef __has_extension
# ifdef __is_identifier
# define BOOST_MOVE_HAS_TRAIT(T) (__has_extension(T) || !__is_identifier(__##T))
# elif __has_extension
# define BOOST_MOVE_HAS_TRAIT(T) __has_extension(T)
# else
# define BOOST_MOVE_HAS_TRAIT(T) 0
@ -200,6 +202,22 @@
# elif BOOST_MOVE_HAS_TRAIT(has_trivial_move_assign)
# define BOOST_MOVE_HAS_TRIVIAL_MOVE_ASSIGN(T) __has_trivial_move_assign(T)
# endif
// BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR
# if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES) && BOOST_MOVE_HAS_TRAIT(is_constructible) && BOOST_MOVE_HAS_TRAIT(is_nothrow_constructible)
# define BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) (__is_constructible(T, T&&) && __is_nothrow_constructible(T, T&&))
# elif BOOST_MOVE_HAS_TRAIT(has_nothrow_move_constructor)
# define BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) __has_nothrow_move_constructor(T)
# endif
// BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN
# if BOOST_MOVE_HAS_TRAIT(is_assignable) && BOOST_MOVE_HAS_TRAIT(is_nothrow_assignable)
# define BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T) (__is_assignable(T, T&&) && __is_nothrow_assignable(T, T&&))
# elif BOOST_MOVE_HAS_TRAIT(has_nothrow_move_assign)
# define BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T) __has_nothrow_move_assign(T)
# endif
// BOOST_MOVE_ALIGNMENT_OF
# define BOOST_MOVE_ALIGNMENT_OF(T) __alignof(T)
#endif //#if defined(BOOST_CLANG)
@ -230,7 +248,84 @@
# define BOOST_MOVE_HAS_NOTHROW_COPY(T) ((__has_nothrow_copy(T) BOOST_MOVE_INTEL_TT_OPTS))
# define BOOST_MOVE_HAS_NOTHROW_ASSIGN(T) ((__has_nothrow_assign(T) BOOST_MOVE_INTEL_TT_OPTS))
#if !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template <typename T>
T && boost_move_tt_declval() BOOST_NOEXCEPT;
# if defined(BOOST_GCC) && (BOOST_GCC >= 80000)
// __is_assignable / __is_constructible implemented
# define BOOST_MOVE_IS_ASSIGNABLE(T, U) __is_assignable(T, U)
# define BOOST_MOVE_IS_CONSTRUCTIBLE(T, U) __is_constructible(T, U)
# else
template<typename Tt, typename Ut>
class boost_move_tt_is_assignable
{
struct twochar { char dummy[2]; };
template < class T
, class U
, class = decltype(boost_move_tt_declval<T>() = boost_move_tt_declval<U>())
> static char test(int);
template<class, class> static twochar test(...);
public:
static const bool value = sizeof(test<Tt, Ut>(0)) == sizeof(char);
};
template<typename Tt, typename Ut>
class boost_move_tt_is_constructible
{
struct twochar { char dummy[2]; };
template < class T
, class U
, class = decltype(T(boost_move_tt_declval<U>()))
> static char test(int);
template<class, class> static twochar test(...);
public:
static const bool value = sizeof(test<Tt, Ut>(0)) == sizeof(char);
};
# define BOOST_MOVE_IS_ASSIGNABLE(T, U) boost_move_tt_is_assignable<T,U>::value
# define BOOST_MOVE_IS_CONSTRUCTIBLE(T, U) boost_move_tt_is_constructible<T, U>::value
# endif
template <typename T, typename U, bool = BOOST_MOVE_IS_ASSIGNABLE(T, U)>
struct boost_move_tt_is_nothrow_assignable
{
static const bool value = false;
};
template <typename T, typename U>
struct boost_move_tt_is_nothrow_assignable<T, U, true>
{
static const bool value = noexcept(boost_move_tt_declval<T>() = boost_move_tt_declval<U>());
};
template <typename T, typename U, bool = BOOST_MOVE_IS_CONSTRUCTIBLE(T, U)>
struct boost_move_tt_is_nothrow_constructible
{
static const bool value = false;
};
template <typename T, typename U>
struct boost_move_tt_is_nothrow_constructible<T, U, true>
{
static const bool value = noexcept(T(boost_move_tt_declval<U>()));
};
# define BOOST_MOVE_HAS_NOTHROW_MOVE_ASSIGN(T) boost_move_tt_is_nothrow_assignable<T, T&&>::value
# define BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) boost_move_tt_is_nothrow_constructible<T, T&&>::value
# endif
# define BOOST_MOVE_IS_ENUM(T) __is_enum(T)
// BOOST_MOVE_ALIGNMENT_OF
# if (!defined(unix) && !defined(__unix__)) || defined(__LP64__)
// GCC sometimes lies about alignment requirements
// of type double on 32-bit unix platforms, use the
@ -355,8 +450,8 @@
#define BOOST_MOVE_IS_NOTHROW_COPY_ASSIGNABLE(T) BOOST_MOVE_IS_TRIVIALLY_COPY_ASSIGNABLE(T)
#endif
#ifdef BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCT
#define BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCT(T) || ::boost::move_detail::is_pod<T>::value
#ifdef BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR
#define BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T) BOOST_MOVE_HAS_NOTHROW_MOVE_CONSTRUCTOR(T) || ::boost::move_detail::is_pod<T>::value
#else
#define BOOST_MOVE_IS_NOTHROW_MOVE_CONSTRUCTIBLE(T) BOOST_MOVE_IS_TRIVIALLY_MOVE_ASSIGNABLE(T)
#endif