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hle/result: Reimplement ResultVal using Common::Expected
Common::Expected effectively provides the same functions as ResultVal, so we can implement it with this. This can be replaced with std::expected with minimal effort should it be standardized in the C++ Standard Template Library.
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1 changed files with 85 additions and 139 deletions
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@ -4,11 +4,10 @@
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#pragma once
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#include <new>
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#include <utility>
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#include "common/assert.h"
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#include "common/bit_field.h"
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#include "common/common_types.h"
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#include "common/expected.h"
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// All the constants in this file come from http://switchbrew.org/index.php?title=Error_codes
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@ -189,150 +188,97 @@ constexpr ResultCode ResultUnknown(UINT32_MAX);
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template <typename T>
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class ResultVal {
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public:
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/// Constructs an empty `ResultVal` with the given error code. The code must not be a success
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/// code.
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ResultVal(ResultCode error_code = ResultUnknown) : result_code(error_code) {
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ASSERT(error_code.IsError());
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}
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constexpr ResultVal() : expected{} {}
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/**
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* Similar to the non-member function `MakeResult`, with the exception that you can manually
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* specify the success code. `success_code` must not be an error code.
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*/
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template <typename... Args>
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[[nodiscard]] static ResultVal WithCode(ResultCode success_code, Args&&... args) {
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ResultVal<T> result;
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result.emplace(success_code, std::forward<Args>(args)...);
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return result;
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}
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constexpr ResultVal(ResultCode code) : expected{Common::Unexpected(code)} {}
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ResultVal(const ResultVal& o) noexcept : result_code(o.result_code) {
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if (!o.empty()) {
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new (&object) T(o.object);
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}
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}
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ResultVal(ResultVal&& o) noexcept : result_code(o.result_code) {
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if (!o.empty()) {
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new (&object) T(std::move(o.object));
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}
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}
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~ResultVal() {
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if (!empty()) {
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object.~T();
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}
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}
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ResultVal& operator=(const ResultVal& o) noexcept {
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if (this == &o) {
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return *this;
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}
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if (!empty()) {
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if (!o.empty()) {
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object = o.object;
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} else {
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object.~T();
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}
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} else {
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if (!o.empty()) {
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new (&object) T(o.object);
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}
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}
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result_code = o.result_code;
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return *this;
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}
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ResultVal& operator=(ResultVal&& o) noexcept {
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if (this == &o) {
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return *this;
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}
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if (!empty()) {
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if (!o.empty()) {
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object = std::move(o.object);
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} else {
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object.~T();
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}
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} else {
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if (!o.empty()) {
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new (&object) T(std::move(o.object));
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}
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}
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result_code = o.result_code;
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return *this;
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}
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/**
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* Replaces the current result with a new constructed result value in-place. The code must not
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* be an error code.
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*/
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template <typename... Args>
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void emplace(ResultCode success_code, Args&&... args) {
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ASSERT(success_code.IsSuccess());
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if (!empty()) {
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object.~T();
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}
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new (&object) T(std::forward<Args>(args)...);
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result_code = success_code;
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}
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/// Returns true if the `ResultVal` contains an error code and no value.
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[[nodiscard]] bool empty() const {
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return result_code.IsError();
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}
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/// Returns true if the `ResultVal` contains a return value.
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[[nodiscard]] bool Succeeded() const {
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return result_code.IsSuccess();
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}
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/// Returns true if the `ResultVal` contains an error code and no value.
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[[nodiscard]] bool Failed() const {
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return empty();
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}
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[[nodiscard]] ResultCode Code() const {
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return result_code;
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}
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[[nodiscard]] const T& operator*() const {
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return object;
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}
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[[nodiscard]] T& operator*() {
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return object;
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}
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[[nodiscard]] const T* operator->() const {
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return &object;
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}
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[[nodiscard]] T* operator->() {
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return &object;
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}
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/// Returns the value contained in this `ResultVal`, or the supplied default if it is missing.
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template <typename U>
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[[nodiscard]] T ValueOr(U&& value) const {
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return !empty() ? object : std::move(value);
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constexpr ResultVal(U&& val) : expected{std::forward<U>(val)} {}
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template <typename... Args>
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constexpr ResultVal(Args&&... args) : expected{std::in_place, std::forward<Args>(args)...} {}
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~ResultVal() = default;
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constexpr ResultVal(const ResultVal&) = default;
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constexpr ResultVal(ResultVal&&) = default;
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ResultVal& operator=(const ResultVal&) = default;
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ResultVal& operator=(ResultVal&&) = default;
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[[nodiscard]] constexpr explicit operator bool() const noexcept {
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return expected.has_value();
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}
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/// Asserts that the result succeeded and returns a reference to it.
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[[nodiscard]] T& Unwrap() & {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return **this;
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[[nodiscard]] constexpr ResultCode Code() const {
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return expected.has_value() ? ResultSuccess : expected.error();
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}
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[[nodiscard]] T&& Unwrap() && {
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[[nodiscard]] constexpr bool Succeeded() const {
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return expected.has_value();
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}
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[[nodiscard]] constexpr bool Failed() const {
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return !expected.has_value();
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}
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[[nodiscard]] constexpr T* operator->() {
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return std::addressof(expected.value());
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}
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[[nodiscard]] constexpr const T* operator->() const {
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return std::addressof(expected.value());
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}
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[[nodiscard]] constexpr T& operator*() & {
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return *expected;
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}
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[[nodiscard]] constexpr const T& operator*() const& {
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return *expected;
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}
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[[nodiscard]] constexpr T&& operator*() && {
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return *expected;
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}
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[[nodiscard]] constexpr const T&& operator*() const&& {
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return *expected;
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}
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[[nodiscard]] constexpr T& Unwrap() & {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return std::move(**this);
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return expected.value();
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}
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[[nodiscard]] constexpr const T& Unwrap() const& {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return expected.value();
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}
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[[nodiscard]] constexpr T&& Unwrap() && {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return std::move(expected.value());
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}
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[[nodiscard]] constexpr const T&& Unwrap() const&& {
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ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
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return std::move(expected.value());
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}
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template <typename U>
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[[nodiscard]] constexpr T ValueOr(U&& v) const& {
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return expected.value_or(v);
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}
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template <typename U>
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[[nodiscard]] constexpr T ValueOr(U&& v) && {
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return expected.value_or(v);
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}
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private:
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// A union is used to allocate the storage for the value, while allowing us to construct and
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// destruct it at will.
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union {
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T object;
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};
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ResultCode result_code;
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// TODO: Replace this with std::expected once it is standardized in the STL.
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Common::Expected<T, ResultCode> expected;
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};
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/**
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@ -341,16 +287,16 @@ private:
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*/
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template <typename T, typename... Args>
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[[nodiscard]] ResultVal<T> MakeResult(Args&&... args) {
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return ResultVal<T>::WithCode(ResultSuccess, std::forward<Args>(args)...);
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return ResultVal<T>{std::forward<Args>(args)...};
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}
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/**
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* Deducible overload of MakeResult, allowing the template parameter to be ommited if you're just
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* copy or move constructing.
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*/
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template <typename Arg>
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[[nodiscard]] ResultVal<std::remove_cvref_t<Arg>> MakeResult(Arg&& arg) {
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return ResultVal<std::remove_cvref_t<Arg>>::WithCode(ResultSuccess, std::forward<Arg>(arg));
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template <typename T>
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[[nodiscard]] ResultVal<std::remove_cvref_t<T>> MakeResult(T&& val) {
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return ResultVal<std::remove_cvref_t<T>>{std::forward<T>(val)};
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}
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/**
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