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[meta] Add is_destructible

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Behdad Esfahbod 2019-05-10 21:49:25 -07:00
parent b14745278a
commit 086772e409
1 changed files with 14 additions and 0 deletions
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14
src/hb-meta.hh
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@ -292,6 +292,15 @@ template <> struct hb_int_max<unsigned long long> : hb_integral_constant<unsigne
#define hb_int_max(T) hb_int_max<T>::value
template <typename T, typename>
struct _hb_is_destructible : hb_false_type {};
template <typename T>
struct _hb_is_destructible<T, hb_void_t<decltype (hb_declval (T).~T ())>> : hb_true_type {};
template <typename T>
using hb_is_destructible = _hb_is_destructible<T, void>;
#define hb_is_destructible(T) hb_is_destructible<T>::value
template <typename T, typename, typename ...Ts>
struct _hb_is_constructible : hb_false_type {};
template <typename T, typename ...Ts>
@ -334,6 +343,11 @@ using hb_is_move_assignable = hb_is_assignable<hb_add_lvalue_reference<T>,
template <typename T> union hb_trivial { T value; };
/* Don't know how to do the following. */
//template <typename T>
//using hb_is_trivially_destructible= hb_is_destructible<hb_trivial<T>>;
//#define hb_is_trivially_destructible(T) hb_is_trivially_destructible<T>::value
/* Don't know how to do the following. */
//template <typename T, typename ...Ts>
//using hb_is_trivially_constructible= hb_is_constructible<hb_trivial<T>, hb_trivial<Ts>...>;