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[met]a Add is_constructible, ...

This commit is contained in:
Behdad Esfahbod 2019-05-10 21:42:59 -07:00
parent 19e08a1467
commit b14745278a
2 changed files with 96 additions and 0 deletions
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73
src/hb-meta.hh
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@ -292,4 +292,77 @@ 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, typename ...Ts>
struct _hb_is_constructible : hb_false_type {};
template <typename T, typename ...Ts>
struct _hb_is_constructible<T, hb_void_t<decltype (T (hb_declval (Ts)...))>, Ts...> : hb_true_type {};
template <typename T, typename ...Ts>
using hb_is_constructible = _hb_is_constructible<T, void, Ts...>;
#define hb_is_constructible(...) hb_is_constructible<__VA_ARGS__>::value
template <typename T>
using hb_is_default_constructible = hb_is_constructible<T>;
#define hb_is_default_constructible(T) hb_is_default_constructible<T>::value
template <typename T>
using hb_is_copy_constructible = hb_is_constructible<T, hb_add_lvalue_reference<hb_add_const<T>>>;
#define hb_is_copy_constructible(T) hb_is_copy_constructible<T>::value
template <typename T>
using hb_is_move_constructible = hb_is_constructible<T, hb_add_rvalue_reference<hb_add_const<T>>>;
#define hb_is_move_constructible(T) hb_is_move_constructible<T>::value
template <typename T, typename U, typename>
struct _hb_is_assignable : hb_false_type {};
template <typename T, typename U>
struct _hb_is_assignable<T, U, hb_void_t<decltype (hb_declval (T) = hb_declval (U))>> : hb_true_type {};
template <typename T, typename U>
using hb_is_assignable = _hb_is_assignable<T, U, void>;
#define hb_is_assignable(T,U) hb_is_assignable<T, U>::value
template <typename T>
using hb_is_copy_assignable = hb_is_assignable<hb_add_lvalue_reference<T>,
hb_add_lvalue_reference<hb_add_const<T>>>;
#define hb_is_copy_assignable(T) hb_is_copy_assignable<T>::value
template <typename T>
using hb_is_move_assignable = hb_is_assignable<hb_add_lvalue_reference<T>,
hb_add_rvalue_reference<T>>;
#define hb_is_move_assignable(T) hb_is_move_assignable<T>::value
/* Trivial versions. */
template <typename T> union hb_trivial { 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>...>;
//#define hb_is_trivially_constructible(...) hb_is_trivially_constructible<__VA_ARGS__>::value
template <typename T>
using hb_is_trivially_default_constructible= hb_is_default_constructible<hb_trivial<T>>;
#define hb_is_trivially_default_constructible(T) hb_is_trivially_default_constructible<T>::value
template <typename T>
using hb_is_trivially_copy_constructible= hb_is_copy_constructible<hb_trivial<T>>;
#define hb_is_trivially_copy_constructible(T) hb_is_trivially_copy_constructible<T>::value
template <typename T>
using hb_is_trivially_move_constructible= hb_is_move_constructible<hb_trivial<T>>;
#define hb_is_trivially_move_constructible(T) hb_is_trivially_move_constructible<T>::value
/* Don't know how to do the following. */
//template <typename T, typename U>
//using hb_is_trivially_assignable= hb_is_assignable<hb_trivial<T>, hb_trivial<U>>;
//#define hb_is_trivially_assignable(T,U) hb_is_trivially_assignable<T, U>::value
template <typename T>
using hb_is_trivially_copy_assignable= hb_is_copy_assignable<hb_trivial<T>>;
#define hb_is_trivially_copy_assignable(T) hb_is_trivially_copy_assignable<T>::value
template <typename T>
using hb_is_trivially_move_assignable= hb_is_move_assignable<hb_trivial<T>>;
#define hb_is_trivially_move_assignable(T) hb_is_trivially_move_assignable<T>::value
#endif /* HB_META_HH */

23
src/test-meta.cc
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@ -27,6 +27,8 @@
#include "hb.hh"
#include "hb-meta.hh"
#include <type_traits>
int
main (int argc, char **argv)
@ -94,5 +96,26 @@ main (int argc, char **argv)
static_assert (hb_is_base_of (X, const Y), "");
static_assert (!hb_is_base_of (Y, X), "");
static_assert (hb_is_constructible (int), "");
static_assert (hb_is_constructible (int, int), "");
static_assert (hb_is_constructible (int, char), "");
static_assert (hb_is_constructible (int, long), "");
static_assert (!hb_is_constructible (int, X), "");
static_assert (!hb_is_constructible (int, int, int), "");
static_assert (hb_is_constructible (X), "");
static_assert (!hb_is_constructible (X, int), "");
static_assert (hb_is_constructible (X, X), "");
static_assert (!hb_is_constructible (X, X, X), "");
static_assert (hb_is_constructible (X, Y), "");
static_assert (!hb_is_constructible (Y, X), "");
static_assert (hb_is_trivially_default_constructible (X), "");
static_assert (hb_is_trivially_default_constructible (Y), "");
static_assert (hb_is_trivially_copy_constructible (X), "");
static_assert (hb_is_trivially_copy_constructible (Y), "");
static_assert (hb_is_trivially_move_constructible (X), "");
static_assert (hb_is_trivially_move_constructible (Y), "");
/* TODO Add more meaningful tests. */
return 0;
}