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Common/Result: Swap order of template parameters to match C++26's std::expected, make all member functions constexpr, and add moving "unexpected" conversion constructor for consistency.

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This commit is contained in:
Jordan Woyak 2025-11-21 19:24:48 -06:00
parent f38a2bbb0e
commit 127e068e51
7 changed files with 36 additions and 32 deletions
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32
Source/Core/Common/Result.h
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@ -7,24 +7,30 @@
namespace Common
{
template <typename ResultCode, typename T>
template <typename Expected, typename Unexpected>
class Result final
{
public:
Result(ResultCode code) : m_variant{code} {}
Result(const T& t) : m_variant{t} {}
Result(T&& t) : m_variant{std::move(t)} {}
explicit operator bool() const { return Succeeded(); }
bool Succeeded() const { return std::holds_alternative<T>(m_variant); }
// Must only be called when Succeeded() returns false.
ResultCode Error() const { return std::get<ResultCode>(m_variant); }
constexpr Result(const Expected& value) : m_variant{value} {}
constexpr Result(Expected&& value) : m_variant{std::move(value)} {}
constexpr Result(const Unexpected& value) : m_variant{value} {}
constexpr Result(Unexpected&& value) : m_variant{std::move(value)} {}
constexpr explicit operator bool() const { return Succeeded(); }
constexpr bool Succeeded() const { return std::holds_alternative<Expected>(m_variant); }
// Must only be called when Succeeded() returns true.
const T& operator*() const { return std::get<T>(m_variant); }
const T* operator->() const { return &std::get<T>(m_variant); }
T& operator*() { return std::get<T>(m_variant); }
T* operator->() { return &std::get<T>(m_variant); }
constexpr const Expected& operator*() const { return std::get<Expected>(m_variant); }
constexpr const Expected* operator->() const { return &std::get<Expected>(m_variant); }
constexpr Expected& operator*() { return std::get<Expected>(m_variant); }
constexpr Expected* operator->() { return &std::get<Expected>(m_variant); }
// Must only be called when Succeeded() returns false.
constexpr Unexpected& Error() { return std::get<Unexpected>(m_variant); }
constexpr const Unexpected& Error() const { return std::get<Unexpected>(m_variant); }
private:
std::variant<ResultCode, T> m_variant;
std::variant<Expected, Unexpected> m_variant;
};
} // namespace Common

2
Source/Core/Core/CheatGeneration.cpp
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@ -52,7 +52,7 @@ static std::vector<ActionReplay::AREntry> ResultToAREntries(u32 addr, const Chea
return codes;
}
Common::Result<Cheats::GenerateActionReplayCodeErrorCode, ActionReplay::ARCode>
Common::Result<ActionReplay::ARCode, Cheats::GenerateActionReplayCodeErrorCode>
Cheats::GenerateActionReplayCode(const Cheats::CheatSearchSessionBase& session, size_t index)
{
if (index >= session.GetResultCount())

2
Source/Core/Core/CheatGeneration.h
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@ -18,6 +18,6 @@ enum class GenerateActionReplayCodeErrorCode
InvalidAddress,
};
Common::Result<GenerateActionReplayCodeErrorCode, ActionReplay::ARCode>
Common::Result<ActionReplay::ARCode, GenerateActionReplayCodeErrorCode>
GenerateActionReplayCode(const Cheats::CheatSearchSessionBase& session, size_t index);
} // namespace Cheats

22
Source/Core/Core/CheatSearch.cpp
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@ -109,11 +109,11 @@ TryReadValueFromEmulatedMemory(const Core::CPUThreadGuard& guard, u32 addr,
}
template <typename T>
Common::Result<Cheats::SearchErrorCode, std::vector<Cheats::SearchResult<T>>>
Cheats::NewSearch(const Core::CPUThreadGuard& guard,
const std::vector<Cheats::MemoryRange>& memory_ranges,
PowerPC::RequestedAddressSpace address_space, bool aligned,
const std::function<bool(const T& value)>& validator)
auto Cheats::NewSearch(const Core::CPUThreadGuard& guard,
const std::vector<Cheats::MemoryRange>& memory_ranges,
PowerPC::RequestedAddressSpace address_space, bool aligned,
const std::function<bool(const T& value)>& validator)
-> Common::Result<std::vector<SearchResult<T>>, SearchErrorCode>
{
if (AchievementManager::GetInstance().IsHardcoreModeActive())
return Cheats::SearchErrorCode::DisabledInHardcoreMode;
@ -162,11 +162,11 @@ Cheats::NewSearch(const Core::CPUThreadGuard& guard,
}
template <typename T>
Common::Result<Cheats::SearchErrorCode, std::vector<Cheats::SearchResult<T>>>
Cheats::NextSearch(const Core::CPUThreadGuard& guard,
const std::vector<Cheats::SearchResult<T>>& previous_results,
PowerPC::RequestedAddressSpace address_space,
const std::function<bool(const T& new_value, const T& old_value)>& validator)
auto Cheats::NextSearch(
const Core::CPUThreadGuard& guard, const std::vector<Cheats::SearchResult<T>>& previous_results,
PowerPC::RequestedAddressSpace address_space,
const std::function<bool(const T& new_value, const T& old_value)>& validator)
-> Common::Result<std::vector<SearchResult<T>>, SearchErrorCode>
{
if (AchievementManager::GetInstance().IsHardcoreModeActive())
return Cheats::SearchErrorCode::DisabledInHardcoreMode;
@ -335,7 +335,7 @@ Cheats::SearchErrorCode Cheats::CheatSearchSession<T>::RunSearch(const Core::CPU
{
if (AchievementManager::GetInstance().IsHardcoreModeActive())
return Cheats::SearchErrorCode::DisabledInHardcoreMode;
Common::Result<SearchErrorCode, std::vector<SearchResult<T>>> result =
Common::Result<std::vector<SearchResult<T>>, SearchErrorCode> result =
Cheats::SearchErrorCode::InvalidParameters;
if (m_filter_type == FilterType::CompareAgainstSpecificValue)
{

4
Source/Core/Core/CheatSearch.h
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@ -116,7 +116,7 @@ std::vector<u8> GetValueAsByteVector(const SearchValue& value);
// Do a new search across the given memory region in the given address space, only keeping values
// for which the given validator returns true.
template <typename T>
Common::Result<SearchErrorCode, std::vector<SearchResult<T>>>
Common::Result<std::vector<SearchResult<T>>, SearchErrorCode>
NewSearch(const Core::CPUThreadGuard& guard, const std::vector<MemoryRange>& memory_ranges,
PowerPC::RequestedAddressSpace address_space, bool aligned,
const std::function<bool(const T& value)>& validator);
@ -124,7 +124,7 @@ NewSearch(const Core::CPUThreadGuard& guard, const std::vector<MemoryRange>& mem
// Refresh the values for the given results in the given address space, only keeping values for
// which the given validator returns true.
template <typename T>
Common::Result<SearchErrorCode, std::vector<SearchResult<T>>>
Common::Result<std::vector<SearchResult<T>>, SearchErrorCode>
NextSearch(const Core::CPUThreadGuard& guard, const std::vector<SearchResult<T>>& previous_results,
PowerPC::RequestedAddressSpace address_space,
const std::function<bool(const T& new_value, const T& old_value)>& validator);

2
Source/Core/Core/IOS/FS/FileSystem.h
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@ -49,7 +49,7 @@ enum class ResultCode
};
template <typename T>
using Result = Common::Result<ResultCode, T>;
using Result = Common::Result<T, ResultCode>;
using Uid = u32;
using Gid = u16;

4
Source/Core/DiscIO/MultithreadedCompressor.h
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@ -8,8 +8,6 @@
#include <memory>
#include <thread>
#include <utility>
#include <variant>
#include <vector>
#include "Common/Assert.h"
#include "Common/Event.h"
@ -27,7 +25,7 @@ enum class ConversionResultCode
};
template <typename T>
using ConversionResult = Common::Result<ConversionResultCode, T>;
using ConversionResult = Common::Result<T, ConversionResultCode>;
// This class starts a number of compression threads and one output thread.
// The set_up_compress_thread_state function is called at the start of each compression thread.