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util: add trait/macro for is_constexpr_constructible

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This commit is contained in:
Michael Scire 2021-10-21 15:21:15 -07:00
parent 7ea4737abb
commit ff1760fac1
2 changed files with 283 additions and 0 deletions
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23
libraries/libvapours/include/vapours/defines.hpp
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@ -80,3 +80,26 @@ namespace ams::impl {
#define AMS_UNUSED(...) ::ams::impl::UnusedImpl(__VA_ARGS__)
#define AMS_INFINITE_LOOP() do { __asm__ __volatile__("" ::: "memory"); } while (1)
#define AMS__NARG__(...) AMS__NARG_I_(__VA_ARGS__,AMS__RSEQ_N())
#define AMS__NARG_I_(...) AMS__ARG_N(__VA_ARGS__)
#define AMS__ARG_N( \
_1, _2, _3, _4, _5, _6, _7, _8, _9,_10, \
_11,_12,_13,_14,_15,_16,_17,_18,_19,_20, \
_21,_22,_23,_24,_25,_26,_27,_28,_29,_30, \
_31,_32,_33,_34,_35,_36,_37,_38,_39,_40, \
_41,_42,_43,_44,_45,_46,_47,_48,_49,_50, \
_51,_52,_53,_54,_55,_56,_57,_58,_59,_60, \
_61,_62,_63,N,...) N
#define AMS__RSEQ_N() \
63,62,61,60, \
59,58,57,56,55,54,53,52,51,50, \
49,48,47,46,45,44,43,42,41,40, \
39,38,37,36,35,34,33,32,31,30, \
29,28,27,26,25,24,23,22,21,20, \
19,18,17,16,15,14,13,12,11,10, \
9,8,7,6,5,4,3,2,1,0
#define AMS__VMACRO_(name, n) name##_##n
#define AMS__VMACRO(name, n) AMS__VMACRO_(name, n)
#define AMS_VMACRO(func, ...) AMS__VMACRO(func, AMS__NARG__(__VA_ARGS__)) (__VA_ARGS__)

260
libraries/libvapours/include/vapours/util/util_type_traits.hpp
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@ -26,4 +26,264 @@ namespace ams::util {
struct ConstantInitializeTag final {};
constexpr inline const ConstantInitializeTag ConstantInitialize{};
namespace impl {
constexpr int ToIntegerForIsConstexprConstructible(...) { return {}; }
template<typename T, auto...Lambdas> requires (std::is_constructible<T, decltype(Lambdas())...>::value)
using ToIntegralConstantForIsConstexprConstructible = std::integral_constant<int, ToIntegerForIsConstexprConstructible(T(Lambdas()...))>;
template<typename T, auto...Lambdas, int = ToIntegralConstantForIsConstexprConstructible<T, Lambdas...>::value>
std::true_type IsConstexprConstructibleImpl(int);
template<typename T, auto...Lambdas>
std::false_type IsConstexprConstructibleImpl(long);
template<typename T>
consteval inline auto ConvertToLambdaForIsConstexprConstructible() { return [] { return T{}; }; }
template<auto V>
consteval inline auto ConvertToLambdaForIsConstexprConstructible() { return [] { return V; }; }
namespace ambiguous_parse {
struct AmbiguousParseHelperForIsConstexprConstructible {
constexpr inline AmbiguousParseHelperForIsConstexprConstructible operator-() { return *this; }
template<typename T>
constexpr inline operator T() {
return T{};
}
};
constexpr inline auto operator -(auto v, AmbiguousParseHelperForIsConstexprConstructible) { return v; }
}
#define AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(TYPE_OR_VALUE) [] { ::ams::util::impl::ambiguous_parse::AmbiguousParseHelperForIsConstexprConstructible p; auto v = (TYPE_OR_VALUE)-p; return v; }
}
template<typename T, typename...ArgTypes>
using is_constexpr_constructible = decltype(impl::IsConstexprConstructibleImpl<T, impl::ConvertToLambdaForIsConstexprConstructible<ArgTypes>()...>(0));
template<typename T, auto...Args>
using is_constexpr_constructible_by_values = decltype(impl::IsConstexprConstructibleImpl<T, impl::ConvertToLambdaForIsConstexprConstructible<Args>()...>(0));
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_1(_1) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_2(_1, _2) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_3(_1, _2, _3) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_4(_1, _2, _3, _4) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_5(_1, _2, _3, _4, _5) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_6(_1, _2, _3, _4, _5, _6) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_7(_1, _2, _3, _4, _5, _6, _7) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_8(_1, _2, _3, _4, _5, _6, _7, _8) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_9(_1, _2, _3, _4, _5, _6, _7, _8, _9) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_10(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_12(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_13(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_14(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_15(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_15) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_16(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_15), \
AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_16) \
>(0))::value)
#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(...) AMS_VMACRO(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE, __VA_ARGS__)
#if 0
namespace test {
struct S {
private:
int m_v;
public:
S() { }
constexpr S(int v) : m_v() { }
constexpr S(int v, double z) : m_v(v) { }
};
consteval inline int test_constexpr_int() { return 0; }
inline int test_not_constexpr_int() { return 0; }
static_assert(!AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, test_constexpr_int()));
static_assert(!AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, test_not_constexpr_int()));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int, double));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int, 0.0));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0, double));
static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0, 0.0));
}
#endif
}