275 lines
11 KiB
C++
275 lines
11 KiB
C++
// Copyright 2025 Steven Le Rouzic
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//
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// SPDX-License-Identifier: BSD-3-Clause
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#pragma once
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#include "asl/base/integers.hpp"
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namespace asl {
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struct source_location
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{
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const char* file;
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int line;
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explicit source_location(
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const char* file_ = __builtin_FILE(),
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int line_ = __builtin_LINE())
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: file{file_}
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, line{line_}
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{}
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};
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struct empty {};
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template<typename T> struct id { using type = T; };
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template<typename... Args> static constexpr isize_t types_count = sizeof...(Args);
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template<typename T, T kValue> struct integral_constant { static constexpr T value = kValue; };
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template<bool B> using bool_constant = integral_constant<bool, B>;
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using true_type = bool_constant<true>;
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using false_type = bool_constant<false>;
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template<bool kSelect, typename U, typename V> struct _select_helper { using type = V; };
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template<typename U, typename V> struct _select_helper<true, U, V> { using type = U; };
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template<bool kSelect, typename U, typename V> using select_t = _select_helper<kSelect, U, V>::type;
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template<typename U, typename V> struct _same_as_helper : false_type {};
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template<typename T> struct _same_as_helper<T, T> : true_type {};
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template<typename U, typename V> concept same_as = _same_as_helper<U, V>::value && _same_as_helper<V, U>::value;
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template<typename T> auto _as_lref_helper(int) -> id<T&>;
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template<typename T> auto _as_lref_helper(...) -> id<T>;
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template<typename T> auto _as_rref_helper(int) -> id<T&&>;
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template<typename T> auto _as_rref_helper(...) -> id<T>;
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template<typename T> using as_lref_t = decltype(_as_lref_helper<T>(0))::type;
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template<typename T> using as_rref_t = decltype(_as_rref_helper<T>(0))::type;
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template<typename T> consteval as_rref_t<T> declval() {}
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template<typename T> struct _un_ref_t { using type = T; };
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template<typename T> struct _un_ref_t<T&> { using type = T; };
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template<typename T> struct _un_ref_t<T&&> { using type = T; };
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template<typename T> using un_ref_t = _un_ref_t<T>::type;
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template<typename T, typename... Args> concept constructible_from = __is_constructible(T, Args...);
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template<typename T> concept default_constructible = constructible_from<T>;
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template<typename T> concept copy_constructible = constructible_from<T, as_lref_t<const T>>;
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template<typename T> concept move_constructible = constructible_from<T, as_rref_t<T>>;
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template<typename T, typename... Args> concept trivially_constructible_from = __is_trivially_constructible(T, Args...);
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template<typename T> concept trivially_default_constructible = trivially_constructible_from<T>;
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template<typename T> concept trivially_copy_constructible = trivially_constructible_from<T, as_lref_t<const T>>;
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template<typename T> concept trivially_move_constructible = trivially_constructible_from<T, as_rref_t<T>>;
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template<typename T, typename... Args> concept assignable_from = __is_assignable(T, Args...);
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template<typename T> concept copy_assignable = assignable_from<as_lref_t<T>, as_lref_t<const T>>;
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template<typename T> concept move_assignable = assignable_from<as_lref_t<T>, as_rref_t<T>>;
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template<typename T, typename... Args> concept trivially_assignable_from = __is_trivially_assignable(T, Args...);
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template<typename T> concept trivially_copy_assignable = trivially_assignable_from<as_lref_t<T>, as_lref_t<const T>>;
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template<typename T> concept trivially_move_assignable = trivially_assignable_from<as_lref_t<T>, as_rref_t<T>>;
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template<typename T> concept trivially_destructible = __is_trivially_destructible(T);
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template<typename T> concept copyable = copy_constructible<T> && copy_assignable<T>;
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template<typename T> concept moveable = move_constructible<T> && move_assignable<T>;
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template<typename To, typename From>
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concept convertible_from = __is_convertible(From, To);
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template<typename From, typename To>
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concept convertible_to = __is_convertible(From, To);
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template<typename Derived, class Base>
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concept derived_from = __is_class(Derived) && __is_class(Base) && convertible_from<const volatile Base*, const volatile Derived*>;
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using nullptr_t = decltype(nullptr);
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template<typename T> struct _un_const_helper { using type = T; };
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template<typename T> struct _un_const_helper<const T> { using type = T; };
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template<typename T> using un_const_t = _un_const_helper<T>::type;
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template<typename T> using as_const_t = const T;
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template<typename T> struct _is_const_helper : false_type {};
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template<typename T> struct _is_const_helper<const T> : true_type {};
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template<typename T> concept is_const = _is_const_helper<T>::value;
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template<typename T> struct _un_volatile_helper { using type = T; };
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template<typename T> struct _un_volatile_helper<volatile T> { using type = T; };
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template<typename T> using un_volatile_t = _un_volatile_helper<T>::type;
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template<typename T> using un_cv_t = un_volatile_t<un_const_t<T>>;
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template<typename T> using un_cvref_t = un_cv_t<un_ref_t<T>>;
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template<typename T> concept is_void = same_as<void, un_cv_t<T>>;
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template<typename T> struct _is_ref_helper { static constexpr bool l = false; static constexpr bool r = false; };
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template<typename T> struct _is_ref_helper<T&> { static constexpr bool l = true; static constexpr bool r = false; };
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template<typename T> struct _is_ref_helper<T&&> { static constexpr bool l = false; static constexpr bool r = true; };
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template<typename T> concept is_ref = _is_ref_helper<T>::l || _is_ref_helper<T>::r;
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template<typename T> concept is_rref = _is_ref_helper<T>::r;
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template<typename T> concept is_lref = _is_ref_helper<T>::l;
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template<typename From, typename To, bool kLref = is_lref<From>, bool kRref = is_rref<From>>
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struct _copy_ref_helper { using type = To; };
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template<typename From, typename To>
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struct _copy_ref_helper<From, To, true, false> { using type = as_lref_t<To>; };
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template<typename From, typename To>
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struct _copy_ref_helper<From, To, false, true> { using type = as_rref_t<To>; };
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template<typename From, typename To, bool kIsConst = is_const<un_ref_t<From>>>
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struct _copy_const_helper { using type = To; };
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template<typename From, typename To>
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struct _copy_const_helper<From, To, true> { using type = const To; };
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template<typename From, typename To> using copy_cref_t =
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_copy_ref_helper<From, typename _copy_const_helper<From, un_cvref_t<To>>::type>::type;
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template<typename T> struct _is_ptr_helper : false_type {};
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template<typename T> struct _is_ptr_helper<T*> : true_type {};
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template<typename T> concept is_ptr = _is_ptr_helper<un_cv_t<T>>::value;
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template<typename T> struct _tame_helper { using type = T; };
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#define TAME_HELPER_IMPL(TRAILING) \
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template<typename R, typename... Args> \
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struct _tame_helper<R(Args...) TRAILING> { using type = R(Args...); } // NOLINT(*-parentheses)
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TAME_HELPER_IMPL();
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TAME_HELPER_IMPL(&);
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TAME_HELPER_IMPL(&&);
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TAME_HELPER_IMPL(const);
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TAME_HELPER_IMPL(const &);
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TAME_HELPER_IMPL(const &&);
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TAME_HELPER_IMPL(volatile);
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TAME_HELPER_IMPL(volatile &);
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TAME_HELPER_IMPL(volatile &&);
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TAME_HELPER_IMPL(const volatile);
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TAME_HELPER_IMPL(const volatile &);
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TAME_HELPER_IMPL(const volatile &&);
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TAME_HELPER_IMPL(noexcept);
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TAME_HELPER_IMPL(& noexcept);
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TAME_HELPER_IMPL(&& noexcept);
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TAME_HELPER_IMPL(const noexcept);
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TAME_HELPER_IMPL(const & noexcept);
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TAME_HELPER_IMPL(const && noexcept);
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TAME_HELPER_IMPL(volatile noexcept);
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TAME_HELPER_IMPL(volatile & noexcept);
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TAME_HELPER_IMPL(volatile && noexcept);
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TAME_HELPER_IMPL(const volatile noexcept);
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TAME_HELPER_IMPL(const volatile & noexcept);
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TAME_HELPER_IMPL(const volatile && noexcept);
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#undef TAME_HELPER_IMPL
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template<typename T> using tame_t = _tame_helper<T>::type;
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template<typename T> struct _is_func_helper : false_type {};
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template<typename R, typename... Args> struct _is_func_helper<R(Args...)> : true_type {};
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template<typename T> concept is_func = _is_func_helper<tame_t<T>>::value;
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template<typename T> concept is_object = !is_void<T> && !is_ref<T> && !is_func<T>;
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template<typename T> struct _is_array_helper : false_type {};
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template<typename T> struct _is_array_helper<T[]> : true_type {};
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template<typename T, int N> struct _is_array_helper<T[N]> : true_type {};
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template<typename T> concept is_array = _is_array_helper<T>::value;
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template<typename T> struct _is_floating_point_helper : false_type {};
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template<> struct _is_floating_point_helper<float> : true_type {};
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template<> struct _is_floating_point_helper<double> : true_type {};
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template<typename T> concept is_floating_point = _is_floating_point_helper<un_cv_t<T>>::value;
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template<typename T> struct _is_integer_helper : false_type {};
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template<> struct _is_integer_helper<int8_t> : true_type {};
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template<> struct _is_integer_helper<int16_t> : true_type {};
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template<> struct _is_integer_helper<int32_t> : true_type {};
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template<> struct _is_integer_helper<int64_t> : true_type {};
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template<> struct _is_integer_helper<uint8_t> : true_type {};
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template<> struct _is_integer_helper<uint16_t> : true_type {};
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template<> struct _is_integer_helper<uint32_t> : true_type {};
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template<> struct _is_integer_helper<uint64_t> : true_type {};
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template<typename T> concept is_integer = _is_integer_helper<un_cv_t<T>>::value;
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template<typename T> concept is_enum = __is_enum(T);
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template<typename T> struct is_uniquely_represented : false_type {};
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template<is_integer T> struct is_uniquely_represented<T> : true_type {};
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template<is_enum T> struct is_uniquely_represented<T> : true_type {};
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template<> struct is_uniquely_represented<uint128_t> : true_type {};
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template<> struct is_uniquely_represented<byte> : true_type {};
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template<typename T> concept uniquely_represented = is_uniquely_represented<un_cv_t<T>>::value;
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template<typename T, typename U>
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concept equality_comparable_with = requires (const un_cvref_t<T>& a, const un_cvref_t<U>& b)
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{
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{ a == b } -> same_as<bool>;
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{ b == a } -> same_as<bool>;
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{ a != b } -> same_as<bool>;
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{ b != a } -> same_as<bool>;
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};
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template<typename T> concept equality_comparable = equality_comparable_with<T, T>;
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struct niche_t {};
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template<typename T>
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concept has_niche = constructible_from<T, niche_t> && equality_comparable_with<T, niche_t>;
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template<typename T>
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concept is_niche = same_as<un_cvref_t<T>, niche_t>;
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template<typename From, typename To>
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concept _dereferenceable_as_convertible = requires(From& t)
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{
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{ *t } -> convertible_to<To&>;
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};
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template<typename From, typename To>
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concept derefs_as = is_object<To> &&
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(convertible_to<un_ref_t<From>&, To&> || _dereferenceable_as_convertible<un_ref_t<From>, To>);
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template<typename To, derefs_as<To> From>
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constexpr auto&& deref(From&& from) // NOLINT(*forward*)
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{
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if constexpr (_dereferenceable_as_convertible<From, To>)
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{
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using deref_type = decltype(*declval<From&&>());
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return static_cast<copy_cref_t<deref_type, To>>(*static_cast<From&&>(from));
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}
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else
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{
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return static_cast<copy_cref_t<From&&, To>>(from);
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}
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}
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} // namespace asl
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