From d8a8169eb20935b777fbaf322fa2d43e8f29d005 Mon Sep 17 00:00:00 2001
From: lizzie <lizzie@eden-emu.dev>
Date: Sat, 27 Jun 2026 08:50:24 +0200
Subject: [hle/bsd] do not use rust-result wannabe Expected in functions
 (#4075)

rust has Result<T,E> but we don't really need that in c++, also the header just sucks, objectively

Signed-off-by: lizzie lizzie@eden-emu.dev

Reviewed-on: https://git.eden-emu.dev/eden-emu/eden/pulls/4075
Reviewed-by: CamilleLaVey <camillelavey99@gmail.com>
Reviewed-by: crueter <crueter@eden-emu.dev>
---
 src/common/CMakeLists.txt |   1 -
 src/common/expected.h     | 986 ----------------------------------------------
 2 files changed, 987 deletions(-)
 delete mode 100644 src/common/expected.h

(limited to 'src/common')

diff --git a/src/common/CMakeLists.txt b/src/common/CMakeLists.txt
index 786effa6bd..7bb4c3aa4a 100644
--- a/src/common/CMakeLists.txt
+++ b/src/common/CMakeLists.txt
@@ -50,7 +50,6 @@ add_library(
     elf.h
     error.cpp
     error.h
-    expected.h
     fiber.cpp
     fiber.h
     fixed_point.h
diff --git a/src/common/expected.h b/src/common/expected.h
deleted file mode 100644
index 5fccfbcbdd..0000000000
--- a/src/common/expected.h
+++ /dev/null
@@ -1,986 +0,0 @@
-// SPDX-FileCopyrightText: Copyright 2021 yuzu Emulator Project
-// SPDX-License-Identifier: GPL-2.0-or-later
-
-// This is based on the proposed implementation of std::expected (P0323)
-// https://github.com/TartanLlama/expected/blob/master/include/tl/expected.hpp
-
-#pragma once
-
-#include <type_traits>
-#include <utility>
-
-namespace Common {
-
-template <typename T, typename E>
-class Expected;
-
-template <typename E>
-class Unexpected {
-public:
-    Unexpected() = delete;
-
-    constexpr explicit Unexpected(const E& e) : m_val{e} {}
-
-    constexpr explicit Unexpected(E&& e) : m_val{std::move(e)} {}
-
-    constexpr E& value() & {
-        return m_val;
-    }
-
-    constexpr const E& value() const& {
-        return m_val;
-    }
-
-    constexpr E&& value() && {
-        return std::move(m_val);
-    }
-
-    constexpr const E&& value() const&& {
-        return std::move(m_val);
-    }
-
-private:
-    E m_val;
-};
-
-template <typename E>
-constexpr auto operator<=>(const Unexpected<E>& lhs, const Unexpected<E>& rhs) {
-    return lhs.value() <=> rhs.value();
-}
-
-struct unexpect_t {
-    constexpr explicit unexpect_t() = default;
-};
-
-namespace detail {
-
-struct no_init_t {
-    constexpr explicit no_init_t() = default;
-};
-
-/**
- * This specialization is for when T is not trivially destructible,
- * so the destructor must be called on destruction of `expected'
- * Additionally, this requires E to be trivially destructible
- */
-template <typename T, typename E, bool = std::is_trivially_destructible_v<T>>
-    requires std::is_trivially_destructible_v<E>
-struct expected_storage_base {
-    constexpr expected_storage_base() : m_val{T{}}, m_has_val{true} {}
-
-    constexpr expected_storage_base(no_init_t) : m_has_val{false} {}
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<T, Args&&...>>* = nullptr>
-    constexpr expected_storage_base(std::in_place_t, Args&&... args)
-        : m_val{std::forward<Args>(args)...}, m_has_val{true} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<T, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr expected_storage_base(std::in_place_t, std::initializer_list<U> il, Args&&... args)
-        : m_val{il, std::forward<Args>(args)...}, m_has_val{true} {}
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<E, Args&&...>>* = nullptr>
-    constexpr explicit expected_storage_base(unexpect_t, Args&&... args)
-        : m_unexpect{std::forward<Args>(args)...}, m_has_val{false} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<E, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr explicit expected_storage_base(unexpect_t, std::initializer_list<U> il,
-                                             Args&&... args)
-        : m_unexpect{il, std::forward<Args>(args)...}, m_has_val{false} {}
-
-    ~expected_storage_base() {
-        if (m_has_val) {
-            m_val.~T();
-        }
-    }
-
-    union {
-        T m_val;
-        Unexpected<E> m_unexpect;
-    };
-
-    bool m_has_val;
-};
-
-/**
- * This specialization is for when T is trivially destructible,
- * so the destructor of `expected` can be trivial
- * Additionally, this requires E to be trivially destructible
- */
-template <typename T, typename E>
-    requires std::is_trivially_destructible_v<E>
-struct expected_storage_base<T, E, true> {
-    constexpr expected_storage_base() : m_val{T{}}, m_has_val{true} {}
-
-    constexpr expected_storage_base(no_init_t) : m_has_val{false} {}
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<T, Args&&...>>* = nullptr>
-    constexpr expected_storage_base(std::in_place_t, Args&&... args)
-        : m_val{std::forward<Args>(args)...}, m_has_val{true} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<T, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr expected_storage_base(std::in_place_t, std::initializer_list<U> il, Args&&... args)
-        : m_val{il, std::forward<Args>(args)...}, m_has_val{true} {}
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<E, Args&&...>>* = nullptr>
-    constexpr explicit expected_storage_base(unexpect_t, Args&&... args)
-        : m_unexpect{std::forward<Args>(args)...}, m_has_val{false} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<E, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr explicit expected_storage_base(unexpect_t, std::initializer_list<U> il,
-                                             Args&&... args)
-        : m_unexpect{il, std::forward<Args>(args)...}, m_has_val{false} {}
-
-    ~expected_storage_base() = default;
-
-    union {
-        T m_val;
-        Unexpected<E> m_unexpect;
-    };
-
-    bool m_has_val;
-};
-
-template <typename T, typename E>
-struct expected_operations_base : expected_storage_base<T, E> {
-    using expected_storage_base<T, E>::expected_storage_base;
-
-    template <typename... Args>
-    void construct(Args&&... args) noexcept {
-        new (std::addressof(this->m_val)) T{std::forward<Args>(args)...};
-        this->m_has_val = true;
-    }
-
-    template <typename Rhs>
-    void construct_with(Rhs&& rhs) noexcept {
-        new (std::addressof(this->m_val)) T{std::forward<Rhs>(rhs).get()};
-        this->m_has_val = true;
-    }
-
-    template <typename... Args>
-    void construct_error(Args&&... args) noexcept {
-        new (std::addressof(this->m_unexpect)) Unexpected<E>{std::forward<Args>(args)...};
-        this->m_has_val = false;
-    }
-
-    void assign(const expected_operations_base& rhs) noexcept {
-        if (!this->m_has_val && rhs.m_has_val) {
-            geterr().~Unexpected<E>();
-            construct(rhs.get());
-        } else {
-            assign_common(rhs);
-        }
-    }
-
-    void assign(expected_operations_base&& rhs) noexcept {
-        if (!this->m_has_val && rhs.m_has_val) {
-            geterr().~Unexpected<E>();
-            construct(std::move(rhs).get());
-        } else {
-            assign_common(rhs);
-        }
-    }
-
-    template <typename Rhs>
-    void assign_common(Rhs&& rhs) {
-        if (this->m_has_val) {
-            if (rhs.m_has_val) {
-                get() = std::forward<Rhs>(rhs).get();
-            } else {
-                destroy_val();
-                construct_error(std::forward<Rhs>(rhs).geterr());
-            }
-        } else {
-            if (!rhs.m_has_val) {
-                geterr() = std::forward<Rhs>(rhs).geterr();
-            }
-        }
-    }
-
-    bool has_value() const {
-        return this->m_has_val;
-    }
-
-    constexpr T& get() & {
-        return this->m_val;
-    }
-
-    constexpr const T& get() const& {
-        return this->m_val;
-    }
-
-    constexpr T&& get() && {
-        return std::move(this->m_val);
-    }
-
-    constexpr const T&& get() const&& {
-        return std::move(this->m_val);
-    }
-
-    constexpr Unexpected<E>& geterr() & {
-        return this->m_unexpect;
-    }
-
-    constexpr const Unexpected<E>& geterr() const& {
-        return this->m_unexpect;
-    }
-
-    constexpr Unexpected<E>&& geterr() && {
-        return std::move(this->m_unexpect);
-    }
-
-    constexpr const Unexpected<E>&& geterr() const&& {
-        return std::move(this->m_unexpect);
-    }
-
-    constexpr void destroy_val() {
-        get().~T();
-    }
-};
-
-/**
- * This manages conditionally having a trivial copy constructor
- * This specialization is for when T is trivially copy constructible
- * Additionally, this requires E to be trivially copy constructible
- */
-template <typename T, typename E, bool = std::is_trivially_copy_constructible_v<T>>
-    requires std::is_trivially_copy_constructible_v<E>
-struct expected_copy_base : expected_operations_base<T, E> {
-    using expected_operations_base<T, E>::expected_operations_base;
-};
-
-/**
- * This specialization is for when T is not trivially copy constructible
- * Additionally, this requires E to be trivially copy constructible
- */
-template <typename T, typename E>
-    requires std::is_trivially_copy_constructible_v<E>
-struct expected_copy_base<T, E, false> : expected_operations_base<T, E> {
-    using expected_operations_base<T, E>::expected_operations_base;
-
-    expected_copy_base() = default;
-
-    expected_copy_base(const expected_copy_base& rhs)
-        : expected_operations_base<T, E>{no_init_t{}} {
-        if (rhs.has_value()) {
-            this->construct_with(rhs);
-        } else {
-            this->construct_error(rhs.geterr());
-        }
-    }
-
-    expected_copy_base(expected_copy_base&&) = default;
-
-    expected_copy_base& operator=(const expected_copy_base&) = default;
-
-    expected_copy_base& operator=(expected_copy_base&&) = default;
-};
-
-/**
- * This manages conditionally having a trivial move constructor
- * This specialization is for when T is trivially move constructible
- * Additionally, this requires E to be trivially move constructible
- */
-template <typename T, typename E, bool = std::is_trivially_move_constructible_v<T>>
-    requires std::is_trivially_move_constructible_v<E>
-struct expected_move_base : expected_copy_base<T, E> {
-    using expected_copy_base<T, E>::expected_copy_base;
-};
-
-/**
- * This specialization is for when T is not trivially move constructible
- * Additionally, this requires E to be trivially move constructible
- */
-template <typename T, typename E>
-    requires std::is_trivially_move_constructible_v<E>
-struct expected_move_base<T, E, false> : expected_copy_base<T, E> {
-    using expected_copy_base<T, E>::expected_copy_base;
-
-    expected_move_base() = default;
-
-    expected_move_base(const expected_move_base&) = default;
-
-    expected_move_base(expected_move_base&& rhs) noexcept(std::is_nothrow_move_constructible_v<T>)
-        : expected_copy_base<T, E>{no_init_t{}} {
-        if (rhs.has_value()) {
-            this->construct_with(std::move(rhs));
-        } else {
-            this->construct_error(std::move(rhs.geterr()));
-        }
-    }
-
-    expected_move_base& operator=(const expected_move_base&) = default;
-
-    expected_move_base& operator=(expected_move_base&&) = default;
-};
-
-/**
- * This manages conditionally having a trivial copy assignment operator
- * This specialization is for when T is trivially copy assignable
- * Additionally, this requires E to be trivially copy assignable
- */
-template <typename T, typename E,
-          bool = std::conjunction_v<std::is_trivially_copy_assignable<T>,
-                                    std::is_trivially_copy_constructible<T>,
-                                    std::is_trivially_destructible<T>>>
-    requires std::conjunction_v<std::is_trivially_copy_assignable<E>,
-                                std::is_trivially_copy_constructible<E>,
-                                std::is_trivially_destructible<E>>
-struct expected_copy_assign_base : expected_move_base<T, E> {
-    using expected_move_base<T, E>::expected_move_base;
-};
-
-/**
- * This specialization is for when T is not trivially copy assignable
- * Additionally, this requires E to be trivially copy assignable
- */
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_trivially_copy_assignable<E>,
-                                std::is_trivially_copy_constructible<E>,
-                                std::is_trivially_destructible<E>>
-struct expected_copy_assign_base<T, E, false> : expected_move_base<T, E> {
-    using expected_move_base<T, E>::expected_move_base;
-
-    expected_copy_assign_base() = default;
-
-    expected_copy_assign_base(const expected_copy_assign_base&) = default;
-
-    expected_copy_assign_base(expected_copy_assign_base&&) = default;
-
-    expected_copy_assign_base& operator=(const expected_copy_assign_base& rhs) {
-        this->assign(rhs);
-        return *this;
-    }
-
-    expected_copy_assign_base& operator=(expected_copy_assign_base&&) = default;
-};
-
-/**
- * This manages conditionally having a trivial move assignment operator
- * This specialization is for when T is trivially move assignable
- * Additionally, this requires E to be trivially move assignable
- */
-template <typename T, typename E,
-          bool = std::conjunction_v<std::is_trivially_move_assignable<T>,
-                                    std::is_trivially_move_constructible<T>,
-                                    std::is_trivially_destructible<T>>>
-    requires std::conjunction_v<std::is_trivially_move_assignable<E>,
-                                std::is_trivially_move_constructible<E>,
-                                std::is_trivially_destructible<E>>
-struct expected_move_assign_base : expected_copy_assign_base<T, E> {
-    using expected_copy_assign_base<T, E>::expected_copy_assign_base;
-};
-
-/**
- * This specialization is for when T is not trivially move assignable
- * Additionally, this requires E to be trivially move assignable
- */
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_trivially_move_assignable<E>,
-                                std::is_trivially_move_constructible<E>,
-                                std::is_trivially_destructible<E>>
-struct expected_move_assign_base<T, E, false> : expected_copy_assign_base<T, E> {
-    using expected_copy_assign_base<T, E>::expected_copy_assign_base;
-
-    expected_move_assign_base() = default;
-
-    expected_move_assign_base(const expected_move_assign_base&) = default;
-
-    expected_move_assign_base(expected_move_assign_base&&) = default;
-
-    expected_move_assign_base& operator=(const expected_move_assign_base&) = default;
-
-    expected_move_assign_base& operator=(expected_move_assign_base&& rhs) noexcept(
-        std::conjunction_v<std::is_nothrow_move_constructible<T>,
-                           std::is_nothrow_move_assignable<T>>) {
-        this->assign(std::move(rhs));
-        return *this;
-    }
-};
-
-/**
- * expected_delete_ctor_base will conditionally delete copy and move constructors
- * depending on whether T is copy/move constructible
- * Additionally, this requires E to be copy/move constructible
- */
-template <typename T, typename E, bool EnableCopy = std::is_copy_constructible_v<T>,
-          bool EnableMove = std::is_move_constructible_v<T>>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>>
-struct expected_delete_ctor_base {
-    expected_delete_ctor_base() = default;
-    expected_delete_ctor_base(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base(expected_delete_ctor_base&&) noexcept = default;
-    expected_delete_ctor_base& operator=(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base& operator=(expected_delete_ctor_base&&) noexcept = default;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>>
-struct expected_delete_ctor_base<T, E, true, false> {
-    expected_delete_ctor_base() = default;
-    expected_delete_ctor_base(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base(expected_delete_ctor_base&&) noexcept = delete;
-    expected_delete_ctor_base& operator=(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base& operator=(expected_delete_ctor_base&&) noexcept = default;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>>
-struct expected_delete_ctor_base<T, E, false, true> {
-    expected_delete_ctor_base() = default;
-    expected_delete_ctor_base(const expected_delete_ctor_base&) = delete;
-    expected_delete_ctor_base(expected_delete_ctor_base&&) noexcept = default;
-    expected_delete_ctor_base& operator=(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base& operator=(expected_delete_ctor_base&&) noexcept = default;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>>
-struct expected_delete_ctor_base<T, E, false, false> {
-    expected_delete_ctor_base() = default;
-    expected_delete_ctor_base(const expected_delete_ctor_base&) = delete;
-    expected_delete_ctor_base(expected_delete_ctor_base&&) noexcept = delete;
-    expected_delete_ctor_base& operator=(const expected_delete_ctor_base&) = default;
-    expected_delete_ctor_base& operator=(expected_delete_ctor_base&&) noexcept = default;
-};
-
-/**
- * expected_delete_assign_base will conditionally delete copy and move assignment operators
- * depending on whether T is copy/move constructible + assignable
- * Additionally, this requires E to be copy/move constructible + assignable
- */
-template <
-    typename T, typename E,
-    bool EnableCopy = std::conjunction_v<std::is_copy_constructible<T>, std::is_copy_assignable<T>>,
-    bool EnableMove = std::conjunction_v<std::is_move_constructible<T>, std::is_move_assignable<T>>>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>,
-                                std::is_copy_assignable<E>, std::is_move_assignable<E>>
-struct expected_delete_assign_base {
-    expected_delete_assign_base() = default;
-    expected_delete_assign_base(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base(expected_delete_assign_base&&) noexcept = default;
-    expected_delete_assign_base& operator=(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base& operator=(expected_delete_assign_base&&) noexcept = default;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>,
-                                std::is_copy_assignable<E>, std::is_move_assignable<E>>
-struct expected_delete_assign_base<T, E, true, false> {
-    expected_delete_assign_base() = default;
-    expected_delete_assign_base(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base(expected_delete_assign_base&&) noexcept = default;
-    expected_delete_assign_base& operator=(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base& operator=(expected_delete_assign_base&&) noexcept = delete;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>,
-                                std::is_copy_assignable<E>, std::is_move_assignable<E>>
-struct expected_delete_assign_base<T, E, false, true> {
-    expected_delete_assign_base() = default;
-    expected_delete_assign_base(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base(expected_delete_assign_base&&) noexcept = default;
-    expected_delete_assign_base& operator=(const expected_delete_assign_base&) = delete;
-    expected_delete_assign_base& operator=(expected_delete_assign_base&&) noexcept = default;
-};
-
-template <typename T, typename E>
-    requires std::conjunction_v<std::is_copy_constructible<E>, std::is_move_constructible<E>,
-                                std::is_copy_assignable<E>, std::is_move_assignable<E>>
-struct expected_delete_assign_base<T, E, false, false> {
-    expected_delete_assign_base() = default;
-    expected_delete_assign_base(const expected_delete_assign_base&) = default;
-    expected_delete_assign_base(expected_delete_assign_base&&) noexcept = default;
-    expected_delete_assign_base& operator=(const expected_delete_assign_base&) = delete;
-    expected_delete_assign_base& operator=(expected_delete_assign_base&&) noexcept = delete;
-};
-
-/**
- * This is needed to be able to construct the expected_default_ctor_base which follows,
- * while still conditionally deleting the default constructor.
- */
-struct default_constructor_tag {
-    constexpr explicit default_constructor_tag() = default;
-};
-
-/**
- * expected_default_ctor_base will ensure that expected
- * has a deleted default constructor if T is not default constructible
- * This specialization is for when T is default constructible
- */
-template <typename T, typename E, bool Enable = std::is_default_constructible_v<T>>
-struct expected_default_ctor_base {
-    constexpr expected_default_ctor_base() noexcept = default;
-    constexpr expected_default_ctor_base(expected_default_ctor_base const&) noexcept = default;
-    constexpr expected_default_ctor_base(expected_default_ctor_base&&) noexcept = default;
-    expected_default_ctor_base& operator=(expected_default_ctor_base const&) noexcept = default;
-    expected_default_ctor_base& operator=(expected_default_ctor_base&&) noexcept = default;
-
-    constexpr explicit expected_default_ctor_base(default_constructor_tag) {}
-};
-
-template <typename T, typename E>
-struct expected_default_ctor_base<T, E, false> {
-    constexpr expected_default_ctor_base() noexcept = delete;
-    constexpr expected_default_ctor_base(expected_default_ctor_base const&) noexcept = default;
-    constexpr expected_default_ctor_base(expected_default_ctor_base&&) noexcept = default;
-    expected_default_ctor_base& operator=(expected_default_ctor_base const&) noexcept = default;
-    expected_default_ctor_base& operator=(expected_default_ctor_base&&) noexcept = default;
-
-    constexpr explicit expected_default_ctor_base(default_constructor_tag) {}
-};
-
-template <typename T, typename E, typename U>
-using expected_enable_forward_value =
-    std::enable_if_t<std::is_constructible_v<T, U&&> &&
-                     !std::is_same_v<std::remove_cvref_t<U>, std::in_place_t> &&
-                     !std::is_same_v<Expected<T, E>, std::remove_cvref_t<U>> &&
-                     !std::is_same_v<Unexpected<E>, std::remove_cvref_t<U>>>;
-
-template <typename T, typename E, typename U, typename G, typename UR, typename GR>
-using expected_enable_from_other = std::enable_if_t<
-    std::is_constructible_v<T, UR> && std::is_constructible_v<E, GR> &&
-    !std::is_constructible_v<T, Expected<U, G>&> && !std::is_constructible_v<T, Expected<U, G>&&> &&
-    !std::is_constructible_v<T, const Expected<U, G>&> &&
-    !std::is_constructible_v<T, const Expected<U, G>&&> &&
-    !std::is_convertible_v<Expected<U, G>&, T> && !std::is_convertible_v<Expected<U, G>&&, T> &&
-    !std::is_convertible_v<const Expected<U, G>&, T> &&
-    !std::is_convertible_v<const Expected<U, G>&&, T>>;
-
-} // namespace detail
-
-template <typename T, typename E>
-class Expected : private detail::expected_move_assign_base<T, E>,
-                 private detail::expected_delete_ctor_base<T, E>,
-                 private detail::expected_delete_assign_base<T, E>,
-                 private detail::expected_default_ctor_base<T, E> {
-public:
-    using value_type = T;
-    using error_type = E;
-    using unexpected_type = Unexpected<E>;
-
-    constexpr Expected() = default;
-    constexpr Expected(const Expected&) = default;
-    constexpr Expected(Expected&&) = default;
-    Expected& operator=(const Expected&) = default;
-    Expected& operator=(Expected&&) = default;
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<T, Args&&...>>* = nullptr>
-    constexpr Expected(std::in_place_t, Args&&... args)
-        : impl_base{std::in_place, std::forward<Args>(args)...},
-          ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<T, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr Expected(std::in_place_t, std::initializer_list<U> il, Args&&... args)
-        : impl_base{std::in_place, il, std::forward<Args>(args)...},
-          ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename G = E, std::enable_if_t<std::is_constructible_v<E, const G&>>* = nullptr,
-              std::enable_if_t<!std::is_convertible_v<const G&, E>>* = nullptr>
-    constexpr explicit Expected(const Unexpected<G>& e)
-        : impl_base{unexpect_t{}, e.value()}, ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename G = E, std::enable_if_t<std::is_constructible_v<E, const G&>>* = nullptr,
-              std::enable_if_t<std::is_convertible_v<const G&, E>>* = nullptr>
-    constexpr Expected(Unexpected<G> const& e)
-        : impl_base{unexpect_t{}, e.value()}, ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename G = E, std::enable_if_t<std::is_constructible_v<E, G&&>>* = nullptr,
-              std::enable_if_t<!std::is_convertible_v<G&&, E>>* = nullptr>
-    constexpr explicit Expected(Unexpected<G>&& e) noexcept(std::is_nothrow_constructible_v<E, G&&>)
-        : impl_base{unexpect_t{}, std::move(e.value())}, ctor_base{
-                                                             detail::default_constructor_tag{}} {}
-
-    template <typename G = E, std::enable_if_t<std::is_constructible_v<E, G&&>>* = nullptr,
-              std::enable_if_t<std::is_convertible_v<G&&, E>>* = nullptr>
-    constexpr Expected(Unexpected<G>&& e) noexcept(std::is_nothrow_constructible_v<E, G&&>)
-        : impl_base{unexpect_t{}, std::move(e.value())}, ctor_base{
-                                                             detail::default_constructor_tag{}} {}
-
-    template <typename... Args, std::enable_if_t<std::is_constructible_v<E, Args&&...>>* = nullptr>
-    constexpr explicit Expected(unexpect_t, Args&&... args)
-        : impl_base{unexpect_t{}, std::forward<Args>(args)...},
-          ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_constructible_v<E, std::initializer_list<U>&, Args&&...>>* =
-                  nullptr>
-    constexpr explicit Expected(unexpect_t, std::initializer_list<U> il, Args&&... args)
-        : impl_base{unexpect_t{}, il, std::forward<Args>(args)...},
-          ctor_base{detail::default_constructor_tag{}} {}
-
-    template <typename U, typename G,
-              std::enable_if_t<!(std::is_convertible_v<U const&, T> &&
-                                 std::is_convertible_v<G const&, E>)>* = nullptr,
-              detail::expected_enable_from_other<T, E, U, G, const U&, const G&>* = nullptr>
-    constexpr explicit Expected(const Expected<U, G>& rhs)
-        : ctor_base{detail::default_constructor_tag{}} {
-        if (rhs.has_value()) {
-            this->construct(*rhs);
-        } else {
-            this->construct_error(rhs.error());
-        }
-    }
-
-    template <typename U, typename G,
-              std::enable_if_t<(std::is_convertible_v<U const&, T> &&
-                                std::is_convertible_v<G const&, E>)>* = nullptr,
-              detail::expected_enable_from_other<T, E, U, G, const U&, const G&>* = nullptr>
-    constexpr Expected(const Expected<U, G>& rhs) : ctor_base{detail::default_constructor_tag{}} {
-        if (rhs.has_value()) {
-            this->construct(*rhs);
-        } else {
-            this->construct_error(rhs.error());
-        }
-    }
-
-    template <typename U, typename G,
-              std::enable_if_t<!(std::is_convertible_v<U&&, T> && std::is_convertible_v<G&&, E>)>* =
-                  nullptr,
-              detail::expected_enable_from_other<T, E, U, G, U&&, G&&>* = nullptr>
-    constexpr explicit Expected(Expected<U, G>&& rhs)
-        : ctor_base{detail::default_constructor_tag{}} {
-        if (rhs.has_value()) {
-            this->construct(std::move(*rhs));
-        } else {
-            this->construct_error(std::move(rhs.error()));
-        }
-    }
-
-    template <typename U, typename G,
-              std::enable_if_t<(std::is_convertible_v<U&&, T> && std::is_convertible_v<G&&, E>)>* =
-                  nullptr,
-              detail::expected_enable_from_other<T, E, U, G, U&&, G&&>* = nullptr>
-    constexpr Expected(Expected<U, G>&& rhs) : ctor_base{detail::default_constructor_tag{}} {
-        if (rhs.has_value()) {
-            this->construct(std::move(*rhs));
-        } else {
-            this->construct_error(std::move(rhs.error()));
-        }
-    }
-
-    template <typename U = T, std::enable_if_t<!std::is_convertible_v<U&&, T>>* = nullptr,
-              detail::expected_enable_forward_value<T, E, U>* = nullptr>
-    constexpr explicit Expected(U&& v) : Expected{std::in_place, std::forward<U>(v)} {}
-
-    template <typename U = T, std::enable_if_t<std::is_convertible_v<U&&, T>>* = nullptr,
-              detail::expected_enable_forward_value<T, E, U>* = nullptr>
-    constexpr Expected(U&& v) : Expected{std::in_place, std::forward<U>(v)} {}
-
-    template <typename U = T, typename G = T,
-              std::enable_if_t<std::is_nothrow_constructible_v<T, U&&>>* = nullptr,
-              std::enable_if_t<(
-                  !std::is_same_v<Expected<T, E>, std::remove_cvref_t<U>> &&
-                  !std::conjunction_v<std::is_scalar<T>, std::is_same<T, std::remove_cvref_t<U>>> &&
-                  std::is_constructible_v<T, U> && std::is_assignable_v<G&, U> &&
-                  std::is_nothrow_move_constructible_v<E>)>* = nullptr>
-    Expected& operator=(U&& v) {
-        if (has_value()) {
-            val() = std::forward<U>(v);
-        } else {
-            err().~Unexpected<E>();
-            new (valptr()) T{std::forward<U>(v)};
-            this->m_has_val = true;
-        }
-
-        return *this;
-    }
-
-    template <typename U = T, typename G = T,
-              std::enable_if_t<!std::is_nothrow_constructible_v<T, U&&>>* = nullptr,
-              std::enable_if_t<(
-                  !std::is_same_v<Expected<T, E>, std::remove_cvref_t<U>> &&
-                  !std::conjunction_v<std::is_scalar<T>, std::is_same<T, std::remove_cvref_t<U>>> &&
-                  std::is_constructible_v<T, U> && std::is_assignable_v<G&, U> &&
-                  std::is_nothrow_move_constructible_v<E>)>* = nullptr>
-    Expected& operator=(U&& v) {
-        if (has_value()) {
-            val() = std::forward<U>(v);
-        } else {
-            auto tmp = std::move(err());
-            err().~Unexpected<E>();
-            new (valptr()) T{std::forward<U>(v)};
-            this->m_has_val = true;
-        }
-
-        return *this;
-    }
-
-    template <typename G = E, std::enable_if_t<std::is_nothrow_copy_constructible_v<G> &&
-                                               std::is_assignable_v<G&, G>>* = nullptr>
-    Expected& operator=(const Unexpected<G>& rhs) {
-        if (!has_value()) {
-            err() = rhs;
-        } else {
-            this->destroy_val();
-            new (errptr()) Unexpected<E>{rhs};
-            this->m_has_val = false;
-        }
-
-        return *this;
-    }
-
-    template <typename G = E, std::enable_if_t<std::is_nothrow_move_constructible_v<G> &&
-                                               std::is_move_assignable_v<G>>* = nullptr>
-    Expected& operator=(Unexpected<G>&& rhs) noexcept {
-        if (!has_value()) {
-            err() = std::move(rhs);
-        } else {
-            this->destroy_val();
-            new (errptr()) Unexpected<E>{std::move(rhs)};
-            this->m_has_val = false;
-        }
-
-        return *this;
-    }
-
-    template <typename... Args,
-              std::enable_if_t<std::is_nothrow_constructible_v<T, Args&&...>>* = nullptr>
-    void emplace(Args&&... args) {
-        if (has_value()) {
-            val() = T{std::forward<Args>(args)...};
-        } else {
-            err().~Unexpected<E>();
-            new (valptr()) T{std::forward<Args>(args)...};
-            this->m_has_val = true;
-        }
-    }
-
-    template <typename... Args,
-              std::enable_if_t<!std::is_nothrow_constructible_v<T, Args&&...>>* = nullptr>
-    void emplace(Args&&... args) {
-        if (has_value()) {
-            val() = T{std::forward<Args>(args)...};
-        } else {
-            auto tmp = std::move(err());
-            err().~Unexpected<E>();
-            new (valptr()) T{std::forward<Args>(args)...};
-            this->m_has_val = true;
-        }
-    }
-
-    template <typename U, typename... Args,
-              std::enable_if_t<std::is_nothrow_constructible_v<T, std::initializer_list<U>&,
-                                                               Args&&...>>* = nullptr>
-    void emplace(std::initializer_list<U> il, Args&&... args) {
-        if (has_value()) {
-            T t{il, std::forward<Args>(args)...};
-            val() = std::move(t);
-        } else {
-            err().~Unexpected<E>();
-            new (valptr()) T{il, std::forward<Args>(args)...};
-            this->m_has_val = true;
-        }
-    }
-
-    template <typename U, typename... Args,
-              std::enable_if_t<!std::is_nothrow_constructible_v<T, std::initializer_list<U>&,
-                                                                Args&&...>>* = nullptr>
-    void emplace(std::initializer_list<U> il, Args&&... args) {
-        if (has_value()) {
-            T t{il, std::forward<Args>(args)...};
-            val() = std::move(t);
-        } else {
-            auto tmp = std::move(err());
-            err().~Unexpected<E>();
-            new (valptr()) T{il, std::forward<Args>(args)...};
-            this->m_has_val = true;
-        }
-    }
-
-    constexpr T* operator->() {
-        return valptr();
-    }
-
-    constexpr const T* operator->() const {
-        return valptr();
-    }
-
-    template <typename U = T>
-    constexpr U& operator*() & {
-        return val();
-    }
-
-    template <typename U = T>
-    constexpr const U& operator*() const& {
-        return val();
-    }
-
-    template <typename U = T>
-    constexpr U&& operator*() && {
-        return std::move(val());
-    }
-
-    template <typename U = T>
-    constexpr const U&& operator*() const&& {
-        return std::move(val());
-    }
-
-    constexpr bool has_value() const noexcept {
-        return this->m_has_val;
-    }
-
-    constexpr explicit operator bool() const noexcept {
-        return this->m_has_val;
-    }
-
-    template <typename U = T>
-    constexpr U& value() & {
-        return val();
-    }
-
-    template <typename U = T>
-    constexpr const U& value() const& {
-        return val();
-    }
-
-    template <typename U = T>
-    constexpr U&& value() && {
-        return std::move(val());
-    }
-
-    template <typename U = T>
-    constexpr const U&& value() const&& {
-        return std::move(val());
-    }
-
-    constexpr E& error() & {
-        return err().value();
-    }
-
-    constexpr const E& error() const& {
-        return err().value();
-    }
-
-    constexpr E&& error() && {
-        return std::move(err().value());
-    }
-
-    constexpr const E&& error() const&& {
-        return std::move(err().value());
-    }
-
-    template <typename U>
-    constexpr T value_or(U&& v) const& {
-        static_assert(std::is_copy_constructible_v<T> && std::is_convertible_v<U&&, T>,
-                      "T must be copy-constructible and convertible from U&&");
-        return bool(*this) ? **this : static_cast<T>(std::forward<U>(v));
-    }
-
-    template <typename U>
-    constexpr T value_or(U&& v) && {
-        static_assert(std::is_move_constructible_v<T> && std::is_convertible_v<U&&, T>,
-                      "T must be move-constructible and convertible from U&&");
-        return bool(*this) ? std::move(**this) : static_cast<T>(std::forward<U>(v));
-    }
-
-private:
-    static_assert(!std::is_reference_v<T>, "T must not be a reference");
-    static_assert(!std::is_same_v<T, std::remove_cv_t<std::in_place_t>>,
-                  "T must not be std::in_place_t");
-    static_assert(!std::is_same_v<T, std::remove_cv_t<unexpect_t>>, "T must not be unexpect_t");
-    static_assert(!std::is_same_v<T, std::remove_cv_t<Unexpected<E>>>,
-                  "T must not be Unexpected<E>");
-    static_assert(!std::is_reference_v<E>, "E must not be a reference");
-
-    T* valptr() {
-        return std::addressof(this->m_val);
-    }
-
-    const T* valptr() const {
-        return std::addressof(this->m_val);
-    }
-
-    Unexpected<E>* errptr() {
-        return std::addressof(this->m_unexpect);
-    }
-
-    const Unexpected<E>* errptr() const {
-        return std::addressof(this->m_unexpect);
-    }
-
-    template <typename U = T>
-    constexpr U& val() {
-        return this->m_val;
-    }
-
-    template <typename U = T>
-    constexpr const U& val() const {
-        return this->m_val;
-    }
-
-    constexpr Unexpected<E>& err() {
-        return this->m_unexpect;
-    }
-
-    constexpr const Unexpected<E>& err() const {
-        return this->m_unexpect;
-    }
-
-    using impl_base = detail::expected_move_assign_base<T, E>;
-    using ctor_base = detail::expected_default_ctor_base<T, E>;
-};
-
-template <typename T, typename E, typename U, typename F>
-constexpr bool operator==(const Expected<T, E>& lhs, const Expected<U, F>& rhs) {
-    return (lhs.has_value() != rhs.has_value())
-               ? false
-               : (!lhs.has_value() ? lhs.error() == rhs.error() : *lhs == *rhs);
-}
-
-template <typename T, typename E, typename U, typename F>
-constexpr bool operator!=(const Expected<T, E>& lhs, const Expected<U, F>& rhs) {
-    return !operator==(lhs, rhs);
-}
-
-template <typename T, typename E, typename U>
-constexpr bool operator==(const Expected<T, E>& x, const U& v) {
-    return x.has_value() ? *x == v : false;
-}
-
-template <typename T, typename E, typename U>
-constexpr bool operator==(const U& v, const Expected<T, E>& x) {
-    return x.has_value() ? *x == v : false;
-}
-
-template <typename T, typename E, typename U>
-constexpr bool operator!=(const Expected<T, E>& x, const U& v) {
-    return !operator==(x, v);
-}
-
-template <typename T, typename E, typename U>
-constexpr bool operator!=(const U& v, const Expected<T, E>& x) {
-    return !operator==(v, x);
-}
-
-template <typename T, typename E>
-constexpr bool operator==(const Expected<T, E>& x, const Unexpected<E>& e) {
-    return x.has_value() ? false : x.error() == e.value();
-}
-
-template <typename T, typename E>
-constexpr bool operator==(const Unexpected<E>& e, const Expected<T, E>& x) {
-    return x.has_value() ? false : x.error() == e.value();
-}
-
-template <typename T, typename E>
-constexpr bool operator!=(const Expected<T, E>& x, const Unexpected<E>& e) {
-    return !operator==(x, e);
-}
-
-template <typename T, typename E>
-constexpr bool operator!=(const Unexpected<E>& e, const Expected<T, E>& x) {
-    return !operator==(e, x);
-}
-
-} // namespace Common
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