mirror of
https://github.com/yuzu-emu/yuzu.git
synced 2024-07-04 23:31:19 +01:00
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.
This commit is contained in:
Morph
parent
a41e9e93dd
commit
52e52924bb
1 changed files with 85 additions and 139 deletions
|
|
@ -4,11 +4,10 @@
|
|||
|
||||
#pragma once
|
||||
|
||||
#include <new>
|
||||
#include <utility>
|
||||
#include "common/assert.h"
|
||||
#include "common/bit_field.h"
|
||||
#include "common/common_types.h"
|
||||
#include "common/expected.h"
|
||||
|
||||
// All the constants in this file come from http://switchbrew.org/index.php?title=Error_codes
|
||||
|
||||
|
|
@ -189,150 +188,97 @@ constexpr ResultCode ResultUnknown(UINT32_MAX);
|
|||
template <typename T>
|
||||
class ResultVal {
|
||||
public:
|
||||
/// Constructs an empty `ResultVal` with the given error code. The code must not be a success
|
||||
/// code.
|
||||
ResultVal(ResultCode error_code = ResultUnknown) : result_code(error_code) {
|
||||
ASSERT(error_code.IsError());
|
||||
}
|
||||
constexpr ResultVal() : expected{} {}
|
||||
|
||||
/**
|
||||
* Similar to the non-member function `MakeResult`, with the exception that you can manually
|
||||
* specify the success code. `success_code` must not be an error code.
|
||||
*/
|
||||
template <typename... Args>
|
||||
[[nodiscard]] static ResultVal WithCode(ResultCode success_code, Args&&... args) {
|
||||
ResultVal<T> result;
|
||||
result.emplace(success_code, std::forward<Args>(args)...);
|
||||
return result;
|
||||
}
|
||||
constexpr ResultVal(ResultCode code) : expected{Common::Unexpected(code)} {}
|
||||
|
||||
ResultVal(const ResultVal& o) noexcept : result_code(o.result_code) {
|
||||
if (!o.empty()) {
|
||||
new (&object) T(o.object);
|
||||
}
|
||||
}
|
||||
|
||||
ResultVal(ResultVal&& o) noexcept : result_code(o.result_code) {
|
||||
if (!o.empty()) {
|
||||
new (&object) T(std::move(o.object));
|
||||
}
|
||||
}
|
||||
|
||||
~ResultVal() {
|
||||
if (!empty()) {
|
||||
object.~T();
|
||||
}
|
||||
}
|
||||
|
||||
ResultVal& operator=(const ResultVal& o) noexcept {
|
||||
if (this == &o) {
|
||||
return *this;
|
||||
}
|
||||
if (!empty()) {
|
||||
if (!o.empty()) {
|
||||
object = o.object;
|
||||
} else {
|
||||
object.~T();
|
||||
}
|
||||
} else {
|
||||
if (!o.empty()) {
|
||||
new (&object) T(o.object);
|
||||
}
|
||||
}
|
||||
result_code = o.result_code;
|
||||
|
||||
return *this;
|
||||
}
|
||||
|
||||
ResultVal& operator=(ResultVal&& o) noexcept {
|
||||
if (this == &o) {
|
||||
return *this;
|
||||
}
|
||||
if (!empty()) {
|
||||
if (!o.empty()) {
|
||||
object = std::move(o.object);
|
||||
} else {
|
||||
object.~T();
|
||||
}
|
||||
} else {
|
||||
if (!o.empty()) {
|
||||
new (&object) T(std::move(o.object));
|
||||
}
|
||||
}
|
||||
result_code = o.result_code;
|
||||
|
||||
return *this;
|
||||
}
|
||||
|
||||
/**
|
||||
* Replaces the current result with a new constructed result value in-place. The code must not
|
||||
* be an error code.
|
||||
*/
|
||||
template <typename... Args>
|
||||
void emplace(ResultCode success_code, Args&&... args) {
|
||||
ASSERT(success_code.IsSuccess());
|
||||
if (!empty()) {
|
||||
object.~T();
|
||||
}
|
||||
new (&object) T(std::forward<Args>(args)...);
|
||||
result_code = success_code;
|
||||
}
|
||||
|
||||
/// Returns true if the `ResultVal` contains an error code and no value.
|
||||
[[nodiscard]] bool empty() const {
|
||||
return result_code.IsError();
|
||||
}
|
||||
|
||||
/// Returns true if the `ResultVal` contains a return value.
|
||||
[[nodiscard]] bool Succeeded() const {
|
||||
return result_code.IsSuccess();
|
||||
}
|
||||
/// Returns true if the `ResultVal` contains an error code and no value.
|
||||
[[nodiscard]] bool Failed() const {
|
||||
return empty();
|
||||
}
|
||||
|
||||
[[nodiscard]] ResultCode Code() const {
|
||||
return result_code;
|
||||
}
|
||||
|
||||
[[nodiscard]] const T& operator*() const {
|
||||
return object;
|
||||
}
|
||||
[[nodiscard]] T& operator*() {
|
||||
return object;
|
||||
}
|
||||
[[nodiscard]] const T* operator->() const {
|
||||
return &object;
|
||||
}
|
||||
[[nodiscard]] T* operator->() {
|
||||
return &object;
|
||||
}
|
||||
|
||||
/// Returns the value contained in this `ResultVal`, or the supplied default if it is missing.
|
||||
template <typename U>
|
||||
[[nodiscard]] T ValueOr(U&& value) const {
|
||||
return !empty() ? object : std::move(value);
|
||||
constexpr ResultVal(U&& val) : expected{std::forward<U>(val)} {}
|
||||
|
||||
template <typename... Args>
|
||||
constexpr ResultVal(Args&&... args) : expected{std::in_place, std::forward<Args>(args)...} {}
|
||||
|
||||
~ResultVal() = default;
|
||||
|
||||
constexpr ResultVal(const ResultVal&) = default;
|
||||
constexpr ResultVal(ResultVal&&) = default;
|
||||
|
||||
ResultVal& operator=(const ResultVal&) = default;
|
||||
ResultVal& operator=(ResultVal&&) = default;
|
||||
|
||||
[[nodiscard]] constexpr explicit operator bool() const noexcept {
|
||||
return expected.has_value();
|
||||
}
|
||||
|
||||
/// Asserts that the result succeeded and returns a reference to it.
|
||||
[[nodiscard]] T& Unwrap() & {
|
||||
ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
|
||||
return **this;
|
||||
[[nodiscard]] constexpr ResultCode Code() const {
|
||||
return expected.has_value() ? ResultSuccess : expected.error();
|
||||
}
|
||||
|
||||
[[nodiscard]] T&& Unwrap() && {
|
||||
[[nodiscard]] constexpr bool Succeeded() const {
|
||||
return expected.has_value();
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr bool Failed() const {
|
||||
return !expected.has_value();
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr T* operator->() {
|
||||
return std::addressof(expected.value());
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr const T* operator->() const {
|
||||
return std::addressof(expected.value());
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr T& operator*() & {
|
||||
return *expected;
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr const T& operator*() const& {
|
||||
return *expected;
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr T&& operator*() && {
|
||||
return *expected;
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr const T&& operator*() const&& {
|
||||
return *expected;
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr T& Unwrap() & {
|
||||
ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
|
||||
return std::move(**this);
|
||||
return expected.value();
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr const T& Unwrap() const& {
|
||||
ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
|
||||
return expected.value();
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr T&& Unwrap() && {
|
||||
ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
|
||||
return std::move(expected.value());
|
||||
}
|
||||
|
||||
[[nodiscard]] constexpr const T&& Unwrap() const&& {
|
||||
ASSERT_MSG(Succeeded(), "Tried to Unwrap empty ResultVal");
|
||||
return std::move(expected.value());
|
||||
}
|
||||
|
||||
template <typename U>
|
||||
[[nodiscard]] constexpr T ValueOr(U&& v) const& {
|
||||
return expected.value_or(v);
|
||||
}
|
||||
|
||||
template <typename U>
|
||||
[[nodiscard]] constexpr T ValueOr(U&& v) && {
|
||||
return expected.value_or(v);
|
||||
}
|
||||
|
||||
private:
|
||||
// A union is used to allocate the storage for the value, while allowing us to construct and
|
||||
// destruct it at will.
|
||||
union {
|
||||
T object;
|
||||
};
|
||||
ResultCode result_code;
|
||||
// TODO: Replace this with std::expected once it is standardized in the STL.
|
||||
Common::Expected<T, ResultCode> expected;
|
||||
};
|
||||
|
||||
/**
|
||||
|
|
@ -341,16 +287,16 @@ private:
|
|||
*/
|
||||
template <typename T, typename... Args>
|
||||
[[nodiscard]] ResultVal<T> MakeResult(Args&&... args) {
|
||||
return ResultVal<T>::WithCode(ResultSuccess, std::forward<Args>(args)...);
|
||||
return ResultVal<T>{std::forward<Args>(args)...};
|
||||
}
|
||||
|
||||
/**
|
||||
* Deducible overload of MakeResult, allowing the template parameter to be ommited if you're just
|
||||
* copy or move constructing.
|
||||
*/
|
||||
template <typename Arg>
|
||||
[[nodiscard]] ResultVal<std::remove_cvref_t<Arg>> MakeResult(Arg&& arg) {
|
||||
return ResultVal<std::remove_cvref_t<Arg>>::WithCode(ResultSuccess, std::forward<Arg>(arg));
|
||||
template <typename T>
|
||||
[[nodiscard]] ResultVal<std::remove_cvref_t<T>> MakeResult(T&& val) {
|
||||
return ResultVal<std::remove_cvref_t<T>>{std::forward<T>(val)};
|
||||
}
|
||||
|
||||
/**
|
||||
|
|
|
|||
Loading…
Reference in a new issue