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Some work on object & init-related traits

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Steven Le Rouzic
2024-08-15 23:35:01 +02:00
parent 03e5d14ed1
commit 4ad4091b38
7 changed files with 193 additions and 0 deletions
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35
asl/meta.hpp
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@ -2,6 +2,8 @@
namespace asl {
template<typename T> struct id { using type = T; };
template<typename T, T kValue> struct integral_constant { static constexpr T value = kValue; };
template<bool B> using bool_constant = integral_constant<bool, B>;
@ -13,6 +15,39 @@ template<typename U, typename V> struct _select_helper<true, U, V>
template<bool kSelect, typename U, typename V> using select_t = _select_helper<kSelect, U, V>::type;
template<typename T> auto _as_lref_helper(int) -> id<T&>;
template<typename T> auto _as_lref_helper(...) -> id<T>;
template<typename T> auto _as_rref_helper(int) -> id<T&&>;
template<typename T> auto _as_rref_helper(...) -> id<T>;
template<typename T> using as_lref_t = decltype(_as_lref_helper<T>(0))::type;
template<typename T> using as_rref_t = decltype(_as_rref_helper<T>(0))::type;
template<typename T, typename... Args> concept constructible = __is_constructible(T, Args...);
template<typename T> concept default_constructible = constructible<T>;
template<typename T> concept copy_constructible = constructible<T, as_lref_t<const T>>;
template<typename T> concept move_constructible = constructible<T, as_rref_t<T>>;
template<typename T, typename... Args> concept trivially_constructible = __is_trivially_constructible(T, Args...);
template<typename T> concept trivially_default_constructible = trivially_constructible<T>;
template<typename T> concept trivially_copy_constructible = trivially_constructible<T, as_lref_t<const T>>;
template<typename T> concept trivially_move_constructible = trivially_constructible<T, as_rref_t<T>>;
template<typename T, typename... Args> concept assignable = __is_assignable(T, Args...);
template<typename T> concept copy_assignable = assignable<as_lref_t<T>, as_lref_t<const T>>;
template<typename T> concept move_assignable = assignable<as_lref_t<T>, as_rref_t<T>>;
template<typename T, typename... Args> concept trivially_assignable = __is_trivially_assignable(T, Args...);
template<typename T> concept trivially_copy_assignable = trivially_assignable<as_lref_t<T>, as_lref_t<const T>>;
template<typename T> concept trivially_move_assignable = trivially_assignable<as_lref_t<T>, as_rref_t<T>>;
template<typename T> concept trivially_destructible = __is_trivially_destructible(T);
using nullptr_t = decltype(nullptr);
template<typename T> struct un_ref { using type = T; };