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https://github.com/Atmosphere-NX/Atmosphere.git
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util: add trait/macro for is_constexpr_constructible
This commit is contained in:
Michael Scire
SciresM
parent
7c1347e692
commit
d8a2b47b0a
2 changed files with 283 additions and 0 deletions
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@ -26,4 +26,264 @@ namespace ams::util {
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struct ConstantInitializeTag final {};
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constexpr inline const ConstantInitializeTag ConstantInitialize{};
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namespace impl {
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constexpr int ToIntegerForIsConstexprConstructible(...) { return {}; }
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template<typename T, auto...Lambdas> requires (std::is_constructible<T, decltype(Lambdas())...>::value)
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using ToIntegralConstantForIsConstexprConstructible = std::integral_constant<int, ToIntegerForIsConstexprConstructible(T(Lambdas()...))>;
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template<typename T, auto...Lambdas, int = ToIntegralConstantForIsConstexprConstructible<T, Lambdas...>::value>
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std::true_type IsConstexprConstructibleImpl(int);
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template<typename T, auto...Lambdas>
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std::false_type IsConstexprConstructibleImpl(long);
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template<typename T>
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consteval inline auto ConvertToLambdaForIsConstexprConstructible() { return [] { return T{}; }; }
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template<auto V>
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consteval inline auto ConvertToLambdaForIsConstexprConstructible() { return [] { return V; }; }
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namespace ambiguous_parse {
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struct AmbiguousParseHelperForIsConstexprConstructible {
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constexpr inline AmbiguousParseHelperForIsConstexprConstructible operator-() { return *this; }
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template<typename T>
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constexpr inline operator T() {
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return T{};
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}
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};
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constexpr inline auto operator -(auto v, AmbiguousParseHelperForIsConstexprConstructible) { return v; }
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}
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#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; }
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}
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template<typename T, typename...ArgTypes>
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using is_constexpr_constructible = decltype(impl::IsConstexprConstructibleImpl<T, impl::ConvertToLambdaForIsConstexprConstructible<ArgTypes>()...>(0));
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template<typename T, auto...Args>
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using is_constexpr_constructible_by_values = decltype(impl::IsConstexprConstructibleImpl<T, impl::ConvertToLambdaForIsConstexprConstructible<Args>()...>(0));
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_1(_1) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_2(_1, _2) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_3(_1, _2, _3) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_4(_1, _2, _3, _4) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_5(_1, _2, _3, _4, _5) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_6(_1, _2, _3, _4, _5, _6) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_7(_1, _2, _3, _4, _5, _6, _7) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_8(_1, _2, _3, _4, _5, _6, _7, _8) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_9(_1, _2, _3, _4, _5, _6, _7, _8, _9) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_10(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_11(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_12(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_13(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_14(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_15(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_15) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE_16(_1, _2, _3, _4, _5, _6, _7, _8, _9, _10, _11, _12, _13, _14, _15, _16) \
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(decltype(::ams::util::impl::IsConstexprConstructibleImpl<_1, \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_2), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_3), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_4), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_5), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_6), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_7), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_8), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_9), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_10), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_11), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_12), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_13), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_14), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_15), \
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AMS_UTIL_IMPL_CONVERT_TV_TO_LAMBDA(_16) \
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>(0))::value)
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#define AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(...) AMS_VMACRO(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE, __VA_ARGS__)
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#if 0
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namespace test {
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struct S {
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private:
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int m_v;
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public:
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S() { }
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constexpr S(int v) : m_v() { }
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constexpr S(int v, double z) : m_v(v) { }
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};
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consteval inline int test_constexpr_int() { return 0; }
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inline int test_not_constexpr_int() { return 0; }
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static_assert(!AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, test_constexpr_int()));
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static_assert(!AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, test_not_constexpr_int()));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int, double));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, int, 0.0));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0, double));
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static_assert(AMS_UTIL_IS_CONSTEXPR_CONSTRUCTIBLE(S, 0, 0.0));
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}
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#endif
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}
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