diff options
| author | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-08-06 00:34:57 +0200 |
|---|---|---|
| committer | Steven Le Rouzic <steven.lerouzic@gmail.com> | 2024-08-07 23:25:42 +0200 |
| commit | 75b10758ba116eabed730d23e957f1d69a1e3cb8 (patch) | |
| tree | 6fb656d6aa18e3b8fd67d0fed39b79234a23fc1d /asl/meta.hpp | |
| parent | 4228e82740f62b841799cfca04861fa217fb93a5 (diff) | |
Type traits
Diffstat (limited to 'asl/meta.hpp')
| -rw-r--r-- | asl/meta.hpp | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/asl/meta.hpp b/asl/meta.hpp new file mode 100644 index 0000000..15f7790 --- /dev/null +++ b/asl/meta.hpp @@ -0,0 +1,89 @@ +#pragma once
+
+namespace asl {
+
+template<typename T, T kValue> struct integral_constant { static constexpr T value = kValue; };
+template<bool B> using bool_constant = integral_constant<bool, B>;
+
+using true_type = bool_constant<true>;
+using false_type = bool_constant<false>;
+
+using nullptr_t = decltype(nullptr);
+
+template<typename T> struct un_ref { using type = T; };
+template<typename T> struct un_ref<T&> { using type = T; };
+template<typename T> struct un_ref<T&&> { using type = T; };
+template<typename T> using un_ref_t = un_ref<T>::type;
+
+template<typename T> struct un_const { using type = T; };
+template<typename T> struct un_const<const T> { using type = T; };
+template<typename T> using un_const_t = un_const<T>::type;
+
+template<typename T> struct un_volatile { using type = T; };
+template<typename T> struct un_volatile<volatile T> { using type = T; };
+template<typename T> using un_volatile_t = un_volatile<T>::type;
+
+template<typename T> using un_qual_t = un_const_t<un_volatile_t<T>>;
+
+template<typename T> using un_qualref_t = un_qual_t<un_ref_t<T>>;
+
+template<typename U, typename V> struct _is_same_helper : false_type {};
+template<typename T> struct _is_same_helper<T, T> : true_type {};
+
+template<typename U, typename V>
+concept is_same = _is_same_helper<U, V>::value && _is_same_helper<V, U>::value;
+
+template<typename T> struct _is_const_helper : false_type {};
+template<typename T> struct _is_const_helper<const T> : true_type {};
+
+template<typename T> concept is_const = _is_const_helper<T>::value;
+
+template<typename T> concept is_void = is_same<un_qual_t<T>, void>;
+template<typename T> concept is_nullptr = is_same<un_qual_t<T>, nullptr_t>;
+
+template<typename T> concept is_integral = __is_integral(T);
+template<typename T> concept is_floating_point = __is_floating_point(T);
+template<typename T> concept is_arithmetic = is_integral<T> || is_floating_point<T>;
+
+template<typename T> struct _is_array_helper : false_type {};
+template<typename T> struct _is_array_helper<T[]> : true_type {};
+template<typename T, size_t N> struct _is_array_helper<T[N]> : true_type {};
+
+template<typename T> concept is_array = _is_array_helper<T>::value;
+
+template<typename T> concept is_class = __is_class(T);
+template<typename T> concept is_union = __is_union(T);
+
+template<typename T> concept is_enum = __is_enum(T);
+
+template<typename T> struct _is_ptr_helper : false_type {};
+template<typename T> struct _is_ptr_helper<T*> : true_type {};
+
+template<typename T> concept is_ptr = _is_ptr_helper<un_qual_t<T>>::value;
+
+template<typename T> struct _is_ref_helper { static constexpr bool lref = false; static constexpr bool rref = false; };
+template<typename T> struct _is_ref_helper<T&> { static constexpr bool lref = true; static constexpr bool rref = false; };
+template<typename T> struct _is_ref_helper<T&&> { static constexpr bool lref = false; static constexpr bool rref = true; };
+
+template<typename T> concept is_lref = _is_ref_helper<T>::lref;
+template<typename T> concept is_rref = _is_ref_helper<T>::rref;
+template<typename T> concept is_ref = is_lref<T> || is_rref<T>;
+
+template<typename T> concept is_func = !is_const<const T> && !is_ref<T>;
+
+template<typename T> struct _is_member_ptr_helper : false_type {};
+template<typename T, typename U> struct _is_member_ptr_helper<T U::*> : true_type {};
+
+template<typename T> struct _is_member_func_ptr_helper : false_type {};
+template<typename T, typename U> struct _is_member_func_ptr_helper<T U::*> : bool_constant<is_func<T>> {};
+
+template<typename T> concept is_member_ptr = _is_member_ptr_helper<un_qual_t<T>>::value;
+template<typename T> concept is_member_func_ptr = _is_member_func_ptr_helper<un_qual_t<T>>::value;
+template<typename T> concept is_member_object_ptr = is_member_ptr<T> && !is_member_func_ptr<T>;
+
+template<typename T> concept is_fundamental = is_arithmetic<T> || is_void<T> || is_nullptr<T>;
+template<typename T> concept is_compound = !is_fundamental<T>;
+template<typename T> concept is_scalar = (is_fundamental<T> && !is_void<T>) || is_enum<T> || is_ptr<T> || is_member_ptr<T>;
+template<typename T> concept is_object = is_scalar<T> || is_array<T> || is_class<T> || is_union<T>;
+
+} // namespace asl
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