Port yuzu-emu/yuzu#4528: "common: Make use of [[nodiscard]] where applicable" (#5535)

Co-authored-by: LC <712067+lioncash@users.noreply.github.com>

src/citra_qt/configuration/configure_input.cpp

@@ -164,7 +164,8 @@ ConfigureInput::ConfigureInput(QWidget* parent)
             continue;
         button_map[button_id]->setContextMenuPolicy(Qt::CustomContextMenu);
         connect(button_map[button_id], &QPushButton::clicked, [=]() {
-            HandleClick(button_map[button_id],
+            HandleClick(
+                button_map[button_id],
                 [=](const Common::ParamPackage& params) {
                     buttons_param[button_id] = params;
                     // If the user closes the dialog, the changes are reverted in
@@ -201,7 +202,8 @@ ConfigureInput::ConfigureInput(QWidget* parent)
             analog_map_buttons[analog_id][sub_button_id]->setContextMenuPolicy(
                 Qt::CustomContextMenu);
             connect(analog_map_buttons[analog_id][sub_button_id], &QPushButton::clicked, [=]() {
-                HandleClick(analog_map_buttons[analog_id][sub_button_id],
+                HandleClick(
+                    analog_map_buttons[analog_id][sub_button_id],
                     [=](const Common::ParamPackage& params) {
                         SetAnalogButton(params, analogs_param[analog_id],
                                         analog_sub_buttons[sub_button_id]);
@@ -239,7 +241,8 @@ ConfigureInput::ConfigureInput(QWidget* parent)
                     tr("After pressing OK, first move your joystick horizontally, "
                        "and then vertically."),
                     QMessageBox::Ok | QMessageBox::Cancel) == QMessageBox::Ok) {
-                HandleClick(analog_map_stick[analog_id],
+                HandleClick(
+                    analog_map_stick[analog_id],
                     [=](const Common::ParamPackage& params) {
                         analogs_param[analog_id] = params;
                         ApplyConfiguration();

src/common/alignment.h

@@ -8,7 +8,7 @@
 namespace Common {
 
 template <typename T>
-constexpr T AlignUp(T value, std::size_t size) {
+[[nodiscard]] constexpr T AlignUp(T value, std::size_t size) {
     static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
     auto mod{value % size};
     value -= mod;
@@ -16,7 +16,7 @@ constexpr T AlignUp(T value, std::size_t size) {
 }
 
 template <typename T>
-constexpr T AlignDown(T value, std::size_t size) {
+[[nodiscard]] constexpr T AlignDown(T value, std::size_t size) {
     static_assert(std::is_unsigned_v<T>, "T must be an unsigned value.");
     return static_cast<T>(value - value % size);
 }

src/common/bit_field.h

@@ -135,8 +135,8 @@ public:
      * containing several bitfields can be assembled by formatting each of their values and ORing
      * the results together.
      */
-    static constexpr FORCE_INLINE StorageType FormatValue(const T& value) {
-        return ((StorageType)value << position) & mask;
+    [[nodiscard]] static constexpr StorageType FormatValue(const T& value) {
+        return (static_cast<StorageType>(value) << position) & mask;
     }
 
     /**
@@ -144,7 +144,7 @@ public:
      * (such as Value() or operator T), but this can be used to extract a value from a bitfield
      * union in a constexpr context.
      */
-    static constexpr FORCE_INLINE T ExtractValue(const StorageType& storage) {
+    [[nodiscard]] static constexpr T ExtractValue(const StorageType& storage) {
         if constexpr (std::numeric_limits<UnderlyingType>::is_signed) {
             std::size_t shift = 8 * sizeof(T) - bits;
             return static_cast<T>(static_cast<UnderlyingType>(storage << (shift - position)) >>
@@ -168,7 +168,7 @@ public:
     constexpr BitField(BitField&&) noexcept = default;
     constexpr BitField& operator=(BitField&&) noexcept = default;
 
-    constexpr operator T() const {
+    [[nodiscard]] constexpr operator T() const {
         return Value();
     }
 
@@ -176,11 +176,11 @@ public:
         storage = (static_cast<StorageType>(storage) & ~mask) | FormatValue(value);
     }
 
-    constexpr T Value() const {
+    [[nodiscard]] constexpr T Value() const {
         return ExtractValue(storage);
     }
 
-    constexpr explicit operator bool() const {
+    [[nodiscard]] constexpr explicit operator bool() const {
         return Value() != 0;
     }
 

src/common/cityhash.h

@@ -61,42 +61,43 @@
 
 #pragma once
 
+#include <cstddef>
+#include <cstdint>
 #include <utility>
-#include <stdint.h>
-#include <stdlib.h> // for std::size_t.
 
 namespace Common {
 
-typedef std::pair<uint64_t, uint64_t> uint128;
+using uint128 = std::pair<uint64_t, uint64_t>;
 
-inline uint64_t Uint128Low64(const uint128& x) {
+[[nodiscard]] inline uint64_t Uint128Low64(const uint128& x) {
     return x.first;
 }
-inline uint64_t Uint128High64(const uint128& x) {
+[[nodiscard]] inline uint64_t Uint128High64(const uint128& x) {
     return x.second;
 }
 
 // Hash function for a byte array.
-uint64_t CityHash64(const char* buf, std::size_t len);
+[[nodiscard]] uint64_t CityHash64(const char* buf, std::size_t len);
 
 // Hash function for a byte array.  For convenience, a 64-bit seed is also
 // hashed into the result.
-uint64_t CityHash64WithSeed(const char* buf, std::size_t len, uint64_t seed);
+[[nodiscard]] uint64_t CityHash64WithSeed(const char* buf, std::size_t len, uint64_t seed);
 
 // Hash function for a byte array.  For convenience, two seeds are also
 // hashed into the result.
-uint64_t CityHash64WithSeeds(const char* buf, std::size_t len, uint64_t seed0, uint64_t seed1);
+[[nodiscard]] uint64_t CityHash64WithSeeds(const char* buf, std::size_t len, uint64_t seed0,
+                                           uint64_t seed1);
 
 // Hash function for a byte array.
-uint128 CityHash128(const char* s, std::size_t len);
+[[nodiscard]] uint128 CityHash128(const char* s, std::size_t len);
 
 // Hash function for a byte array.  For convenience, a 128-bit seed is also
 // hashed into the result.
-uint128 CityHash128WithSeed(const char* s, std::size_t len, uint128 seed);
+[[nodiscard]] uint128 CityHash128WithSeed(const char* s, std::size_t len, uint128 seed);
 
 // Hash 128 input bits down to 64 bits of output.
 // This is intended to be a reasonably good hash function.
-inline uint64_t Hash128to64(const uint128& x) {
+[[nodiscard]] inline uint64_t Hash128to64(const uint128& x) {
     // Murmur-inspired hashing.
     const uint64_t kMul = 0x9ddfea08eb382d69ULL;
     uint64_t a = (Uint128Low64(x) ^ Uint128High64(x)) * kMul;

src/common/color.h

@@ -13,42 +13,42 @@
 namespace Color {
 
 /// Convert a 1-bit color component to 8 bit
-constexpr u8 Convert1To8(u8 value) {
+[[nodiscard]] constexpr u8 Convert1To8(u8 value) {
     return value * 255;
 }
 
 /// Convert a 4-bit color component to 8 bit
-constexpr u8 Convert4To8(u8 value) {
+[[nodiscard]] constexpr u8 Convert4To8(u8 value) {
     return (value << 4) | value;
 }
 
 /// Convert a 5-bit color component to 8 bit
-constexpr u8 Convert5To8(u8 value) {
+[[nodiscard]] constexpr u8 Convert5To8(u8 value) {
     return (value << 3) | (value >> 2);
 }
 
 /// Convert a 6-bit color component to 8 bit
-constexpr u8 Convert6To8(u8 value) {
+[[nodiscard]] constexpr u8 Convert6To8(u8 value) {
     return (value << 2) | (value >> 4);
 }
 
 /// Convert a 8-bit color component to 1 bit
-constexpr u8 Convert8To1(u8 value) {
+[[nodiscard]] constexpr u8 Convert8To1(u8 value) {
     return value >> 7;
 }
 
 /// Convert a 8-bit color component to 4 bit
-constexpr u8 Convert8To4(u8 value) {
+[[nodiscard]] constexpr u8 Convert8To4(u8 value) {
     return value >> 4;
 }
 
 /// Convert a 8-bit color component to 5 bit
-constexpr u8 Convert8To5(u8 value) {
+[[nodiscard]] constexpr u8 Convert8To5(u8 value) {
     return value >> 3;
 }
 
 /// Convert a 8-bit color component to 6 bit
-constexpr u8 Convert8To6(u8 value) {
+[[nodiscard]] constexpr u8 Convert8To6(u8 value) {
     return value >> 2;
 }
 
@@ -57,7 +57,7 @@ constexpr u8 Convert8To6(u8 value) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRGBA8(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRGBA8(const u8* bytes) {
     return {bytes[3], bytes[2], bytes[1], bytes[0]};
 }
 
@@ -66,7 +66,7 @@ inline Common::Vec4<u8> DecodeRGBA8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRGB8(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRGB8(const u8* bytes) {
     return {bytes[2], bytes[1], bytes[0], 255};
 }
 
@@ -75,7 +75,7 @@ inline Common::Vec4<u8> DecodeRGB8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRG8(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRG8(const u8* bytes) {
     return {bytes[1], bytes[0], 0, 255};
 }
 
@@ -84,7 +84,7 @@ inline Common::Vec4<u8> DecodeRG8(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRGB565(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRGB565(const u8* bytes) {
     u16_le pixel;
     std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert5To8((pixel >> 11) & 0x1F), Convert6To8((pixel >> 5) & 0x3F),
@@ -96,7 +96,7 @@ inline Common::Vec4<u8> DecodeRGB565(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
     u16_le pixel;
     std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert5To8((pixel >> 11) & 0x1F), Convert5To8((pixel >> 6) & 0x1F),
@@ -108,7 +108,7 @@ inline Common::Vec4<u8> DecodeRGB5A1(const u8* bytes) {
  * @param bytes Pointer to encoded source color
  * @return Result color decoded as Common::Vec4<u8>
  */
-inline Common::Vec4<u8> DecodeRGBA4(const u8* bytes) {
+[[nodiscard]] inline Common::Vec4<u8> DecodeRGBA4(const u8* bytes) {
     u16_le pixel;
     std::memcpy(&pixel, bytes, sizeof(pixel));
     return {Convert4To8((pixel >> 12) & 0xF), Convert4To8((pixel >> 8) & 0xF),
@@ -120,7 +120,7 @@ inline Common::Vec4<u8> DecodeRGBA4(const u8* bytes) {
  * @param bytes Pointer to encoded source value
  * @return Depth value as an u32
  */
-inline u32 DecodeD16(const u8* bytes) {
+[[nodiscard]] inline u32 DecodeD16(const u8* bytes) {
     u16_le data;
     std::memcpy(&data, bytes, sizeof(data));
     return data;
@@ -131,7 +131,7 @@ inline u32 DecodeD16(const u8* bytes) {
  * @param bytes Pointer to encoded source value
  * @return Depth value as an u32
  */
-inline u32 DecodeD24(const u8* bytes) {
+[[nodiscard]] inline u32 DecodeD24(const u8* bytes) {
     return (bytes[2] << 16) | (bytes[1] << 8) | bytes[0];
 }
 
@@ -140,7 +140,7 @@ inline u32 DecodeD24(const u8* bytes) {
  * @param bytes Pointer to encoded source values
  * @return Resulting values stored as a Common::Vec2
  */
-inline Common::Vec2<u32> DecodeD24S8(const u8* bytes) {
+[[nodiscard]] inline Common::Vec2<u32> DecodeD24S8(const u8* bytes) {
     return {static_cast<u32>((bytes[2] << 16) | (bytes[1] << 8) | bytes[0]), bytes[3]};
 }
 

src/common/common_funcs.h

@@ -57,4 +57,4 @@ __declspec(dllimport) void __stdcall DebugBreak(void);
 // Call directly after the command or use the error num.
 // This function might change the error code.
 // Defined in Misc.cpp.
-std::string GetLastErrorMsg();
+[[nodiscard]] std::string GetLastErrorMsg();

src/common/detached_tasks.cpp

@@ -34,8 +34,7 @@ void DetachedTasks::AddTask(std::function<void()> task) {
         std::unique_lock lock{instance->mutex};
         --instance->count;
         std::notify_all_at_thread_exit(instance->cv, std::move(lock));
-    })
-        .detach();
+    }).detach();
 }
 
 } // namespace Common

src/common/file_util.h

@@ -91,19 +91,19 @@ private:
 };
 
 // Returns true if file filename exists
-bool Exists(const std::string& filename);
+[[nodiscard]] bool Exists(const std::string& filename);
 
 // Returns true if filename is a directory
-bool IsDirectory(const std::string& filename);
+[[nodiscard]] bool IsDirectory(const std::string& filename);
 
 // Returns the size of filename (64bit)
-u64 GetSize(const std::string& filename);
+[[nodiscard]] u64 GetSize(const std::string& filename);
 
 // Overloaded GetSize, accepts file descriptor
-u64 GetSize(const int fd);
+[[nodiscard]] u64 GetSize(int fd);
 
 // Overloaded GetSize, accepts FILE*
-u64 GetSize(FILE* f);
+[[nodiscard]] u64 GetSize(FILE* f);
 
 // Returns true if successful, or path already exists.
 bool CreateDir(const std::string& filename);
@@ -170,7 +170,7 @@ void GetAllFilesFromNestedEntries(FSTEntry& directory, std::vector<FSTEntry>& ou
 bool DeleteDirRecursively(const std::string& directory, unsigned int recursion = 256);
 
 // Returns the current directory
-std::optional<std::string> GetCurrentDir();
+[[nodiscard]] std::optional<std::string> GetCurrentDir();
 
 // Create directory and copy contents (does not overwrite existing files)
 void CopyDir(const std::string& source_path, const std::string& dest_path);
@@ -184,18 +184,18 @@ void SetCurrentRomPath(const std::string& path);
 
 // Returns a pointer to a string with a Citra data dir in the user's home
 // directory. To be used in "multi-user" mode (that is, installed).
-const std::string& GetUserPath(UserPath path);
+[[nodiscard]] const std::string& GetUserPath(UserPath path);
 
 // Returns the path to where the sys file are
-std::string GetSysDirectory();
+[[nodiscard]] std::string GetSysDirectory();
 
 #ifdef __APPLE__
-std::string GetBundleDirectory();
+[[nodiscard]] std::string GetBundleDirectory();
 #endif
 
 #ifdef _WIN32
-const std::string& GetExeDirectory();
-std::string AppDataRoamingDirectory();
+[[nodiscard]] const std::string& GetExeDirectory();
+[[nodiscard]] std::string AppDataRoamingDirectory();
 #endif
 
 std::size_t WriteStringToFile(bool text_file, const std::string& filename, std::string_view str);
@@ -214,37 +214,44 @@ void SplitFilename83(const std::string& filename, std::array<char, 9>& short_nam
 
 // Splits the path on '/' or '\' and put the components into a vector
 // i.e. "C:\Users\Yuzu\Documents\save.bin" becomes {"C:", "Users", "Yuzu", "Documents", "save.bin" }
-std::vector<std::string> SplitPathComponents(std::string_view filename);
+[[nodiscard]] std::vector<std::string> SplitPathComponents(std::string_view filename);
 
 // Gets all of the text up to the last '/' or '\' in the path.
-std::string_view GetParentPath(std::string_view path);
+[[nodiscard]] std::string_view GetParentPath(std::string_view path);
 
 // Gets all of the text after the first '/' or '\' in the path.
-std::string_view GetPathWithoutTop(std::string_view path);
+[[nodiscard]] std::string_view GetPathWithoutTop(std::string_view path);
 
 // Gets the filename of the path
-std::string_view GetFilename(std::string_view path);
+[[nodiscard]] std::string_view GetFilename(std::string_view path);
 
 // Gets the extension of the filename
-std::string_view GetExtensionFromFilename(std::string_view name);
+[[nodiscard]] std::string_view GetExtensionFromFilename(std::string_view name);
 
 // Removes the final '/' or '\' if one exists
-std::string_view RemoveTrailingSlash(std::string_view path);
+[[nodiscard]] std::string_view RemoveTrailingSlash(std::string_view path);
 
 // Creates a new vector containing indices [first, last) from the original.
 template <typename T>
-std::vector<T> SliceVector(const std::vector<T>& vector, std::size_t first, std::size_t last) {
-    if (first >= last)
+[[nodiscard]] std::vector<T> SliceVector(const std::vector<T>& vector, std::size_t first,
+                                         std::size_t last) {
+    if (first >= last) {
         return {};
+    }
     last = std::min<std::size_t>(last, vector.size());
     return std::vector<T>(vector.begin() + first, vector.begin() + first + last);
 }
 
-enum class DirectorySeparator { ForwardSlash, BackwardSlash, PlatformDefault };
+enum class DirectorySeparator {
+    ForwardSlash,
+    BackwardSlash,
+    PlatformDefault,
+};
 
 // Removes trailing slash, makes all '\\' into '/', and removes duplicate '/'. Makes '/' into '\\'
 // depending if directory_separator is BackwardSlash or PlatformDefault and running on windows
-std::string SanitizePath(std::string_view path,
+[[nodiscard]] std::string SanitizePath(
+    std::string_view path,
     DirectorySeparator directory_separator = DirectorySeparator::ForwardSlash);
 
 // simple wrapper for cstdlib file functions to
@@ -314,21 +321,21 @@ public:
         return WriteArray(str.data(), str.length());
     }
 
-    bool IsOpen() const {
+    [[nodiscard]] bool IsOpen() const {
         return nullptr != m_file;
     }
 
     // m_good is set to false when a read, write or other function fails
-    bool IsGood() const {
+    [[nodiscard]] bool IsGood() const {
         return m_good;
     }
-    explicit operator bool() const {
+    [[nodiscard]] explicit operator bool() const {
         return IsGood();
     }
 
     bool Seek(s64 off, int origin);
-    u64 Tell() const;
-    u64 GetSize() const;
+    [[nodiscard]] u64 Tell() const;
+    [[nodiscard]] u64 GetSize() const;
     bool Resize(u64 size);
     bool Flush();
 

src/common/math_util.h

@@ -23,25 +23,25 @@ struct Rectangle {
     constexpr Rectangle(T left, T top, T right, T bottom)
         : left(left), top(top), right(right), bottom(bottom) {}
 
-    T GetWidth() const {
+    [[nodiscard]] T GetWidth() const {
         return std::abs(static_cast<std::make_signed_t<T>>(right - left));
     }
-    T GetHeight() const {
+    [[nodiscard]] T GetHeight() const {
         return std::abs(static_cast<std::make_signed_t<T>>(bottom - top));
     }
-    Rectangle<T> TranslateX(const T x) const {
+    [[nodiscard]] Rectangle<T> TranslateX(const T x) const {
         return Rectangle{left + x, top, right + x, bottom};
     }
-    Rectangle<T> TranslateY(const T y) const {
+    [[nodiscard]] Rectangle<T> TranslateY(const T y) const {
         return Rectangle{left, top + y, right, bottom + y};
     }
-    Rectangle<T> Scale(const float s) const {
+    [[nodiscard]] Rectangle<T> Scale(const float s) const {
         return Rectangle{left, top, static_cast<T>(left + GetWidth() * s),
                          static_cast<T>(top + GetHeight() * s)};
     }
 };
 
 template <typename T>
-Rectangle(T, T, T, T)->Rectangle<T>;
+Rectangle(T, T, T, T) -> Rectangle<T>;
 
 } // namespace Common

src/common/param_package.h

@@ -24,14 +24,14 @@ public:
     ParamPackage& operator=(const ParamPackage& other) = default;
     ParamPackage& operator=(ParamPackage&& other) = default;
 
-    std::string Serialize() const;
-    std::string Get(const std::string& key, const std::string& default_value) const;
-    int Get(const std::string& key, int default_value) const;
-    float Get(const std::string& key, float default_value) const;
+    [[nodiscard]] std::string Serialize() const;
+    [[nodiscard]] std::string Get(const std::string& key, const std::string& default_value) const;
+    [[nodiscard]] int Get(const std::string& key, int default_value) const;
+    [[nodiscard]] float Get(const std::string& key, float default_value) const;
     void Set(const std::string& key, std::string value);
     void Set(const std::string& key, int value);
     void Set(const std::string& key, float value);
-    bool Has(const std::string& key) const;
+    [[nodiscard]] bool Has(const std::string& key) const;
     void Erase(const std::string& key);
     void Clear();
 

src/common/quaternion.h

@@ -14,35 +14,36 @@ public:
     Vec3<T> xyz;
     T w{};
 
-    Quaternion<decltype(-T{})> Inverse() const {
+    [[nodiscard]] Quaternion<decltype(-T{})> Inverse() const {
         return {-xyz, w};
     }
 
-    Quaternion<decltype(T{} + T{})> operator+(const Quaternion& other) const {
+    [[nodiscard]] Quaternion<decltype(T{} + T{})> operator+(const Quaternion& other) const {
         return {xyz + other.xyz, w + other.w};
     }
 
-    Quaternion<decltype(T{} - T{})> operator-(const Quaternion& other) const {
+    [[nodiscard]] Quaternion<decltype(T{} - T{})> operator-(const Quaternion& other) const {
         return {xyz - other.xyz, w - other.w};
     }
 
-    Quaternion<decltype(T{} * T{} - T{} * T{})> operator*(const Quaternion& other) const {
+    [[nodiscard]] Quaternion<decltype(T{} * T{} - T{} * T{})> operator*(
+        const Quaternion& other) const {
         return {xyz * other.w + other.xyz * w + Cross(xyz, other.xyz),
                 w * other.w - Dot(xyz, other.xyz)};
     }
 
-    Quaternion<T> Normalized() const {
+    [[nodiscard]] Quaternion<T> Normalized() const {
         T length = std::sqrt(xyz.Length2() + w * w);
         return {xyz / length, w / length};
     }
 };
 
 template <typename T>
-auto QuaternionRotate(const Quaternion<T>& q, const Vec3<T>& v) {
+[[nodiscard]] auto QuaternionRotate(const Quaternion<T>& q, const Vec3<T>& v) {
     return v + 2 * Cross(q.xyz, Cross(q.xyz, v) + v * q.w);
 }
 
-inline Quaternion<float> MakeQuaternion(const Vec3<float>& axis, float angle) {
+[[nodiscard]] inline Quaternion<float> MakeQuaternion(const Vec3<float>& axis, float angle) {
     return {axis * std::sin(angle / 2), std::cos(angle / 2)};
 }
 

src/common/ring_buffer.h

@@ -91,12 +91,12 @@ public:
     }
 
     /// @returns Number of slots used
-    std::size_t Size() const {
+    [[nodiscard]] std::size_t Size() const {
         return m_write_index.load() - m_read_index.load();
     }
 
     /// @returns Maximum size of ring buffer
-    constexpr std::size_t Capacity() const {
+    [[nodiscard]] constexpr std::size_t Capacity() const {
         return capacity;
     }
 

src/common/string_util.h

@@ -14,17 +14,17 @@
 namespace Common {
 
 /// Make a string lowercase
-std::string ToLower(std::string str);
+[[nodiscard]] std::string ToLower(std::string str);
 
 /// Make a string uppercase
-std::string ToUpper(std::string str);
+[[nodiscard]] std::string ToUpper(std::string str);
 
-std::string StripSpaces(const std::string& s);
-std::string StripQuotes(const std::string& s);
+[[nodiscard]] std::string StripSpaces(const std::string& s);
+[[nodiscard]] std::string StripQuotes(const std::string& s);
 
-std::string StringFromBool(bool value);
+[[nodiscard]] std::string StringFromBool(bool value);
 
-std::string TabsToSpaces(int tab_size, std::string in);
+[[nodiscard]] std::string TabsToSpaces(int tab_size, std::string in);
 
 void SplitString(const std::string& str, char delim, std::vector<std::string>& output);
 
@@ -34,14 +34,15 @@ bool SplitPath(const std::string& full_path, std::string* _pPath, std::string* _
 
 void BuildCompleteFilename(std::string& _CompleteFilename, const std::string& _Path,
                            const std::string& _Filename);
-std::string ReplaceAll(std::string result, const std::string& src, const std::string& dest);
+[[nodiscard]] std::string ReplaceAll(std::string result, const std::string& src,
+                                     const std::string& dest);
 
-std::string UTF16ToUTF8(const std::u16string& input);
-std::u16string UTF8ToUTF16(const std::string& input);
+[[nodiscard]] std::string UTF16ToUTF8(const std::u16string& input);
+[[nodiscard]] std::u16string UTF8ToUTF16(const std::string& input);
 
 #ifdef _WIN32
-std::string UTF16ToUTF8(const std::wstring& input);
-std::wstring UTF8ToUTF16W(const std::string& str);
+[[nodiscard]] std::string UTF16ToUTF8(const std::wstring& input);
+[[nodiscard]] std::wstring UTF8ToUTF16W(const std::string& str);
 
 #endif
 
@@ -50,7 +51,7 @@ std::wstring UTF8ToUTF16W(const std::string& str);
  * `other` for equality.
  */
 template <typename InIt>
-bool ComparePartialString(InIt begin, InIt end, const char* other) {
+[[nodiscard]] bool ComparePartialString(InIt begin, InIt end, const char* other) {
     for (; begin != end && *other != '\0'; ++begin, ++other) {
         if (*begin != *other) {
             return false;
@@ -78,6 +79,7 @@ std::string UTF16BufferToUTF8(const T& text) {
  * Creates a std::string from a fixed-size NUL-terminated char buffer. If the buffer isn't
  * NUL-terminated then the string ends at max_len characters.
  */
-std::string StringFromFixedZeroTerminatedBuffer(const char* buffer, std::size_t max_len);
+[[nodiscard]] std::string StringFromFixedZeroTerminatedBuffer(const char* buffer,
+                                                              std::size_t max_len);
 
 } // namespace Common

src/common/telemetry.h

@@ -63,30 +63,30 @@ public:
 
     void Accept(VisitorInterface& visitor) const override;
 
-    const std::string& GetName() const override {
+    [[nodiscard]] const std::string& GetName() const override {
         return name;
     }
 
     /**
      * Returns the type of the field.
      */
-    FieldType GetType() const {
+    [[nodiscard]] FieldType GetType() const {
         return type;
     }
 
     /**
      * Returns the value of the field.
      */
-    const T& GetValue() const {
+    [[nodiscard]] const T& GetValue() const {
         return value;
     }
 
-    bool operator==(const Field& other) const {
+    [[nodiscard]] bool operator==(const Field& other) const {
         return (type == other.type) && (name == other.name) && (value == other.value);
     }
 
-    bool operator!=(const Field& other) const {
-        return !(*this == other);
+    [[nodiscard]] bool operator!=(const Field& other) const {
+        return !operator==(other);
     }
 
 private:

src/common/thread_queue_list.h

@@ -19,19 +19,19 @@ struct ThreadQueueList {
     //               (dynamically resizable) circular buffers to remove their overhead when
     //               inserting and popping.
 
-    typedef unsigned int Priority;
+    using Priority = unsigned int;
 
     // Number of priority levels. (Valid levels are [0..NUM_QUEUES).)
-    static const Priority NUM_QUEUES = N;
+    static constexpr Priority NUM_QUEUES = N;
 
     ThreadQueueList() {
         first = nullptr;
     }
 
     // Only for debugging, returns priority level.
-    Priority contains(const T& uid) {
+    [[nodiscard]] Priority contains(const T& uid) const {
         for (Priority i = 0; i < NUM_QUEUES; ++i) {
-            Queue& cur = queues[i];
+            const Queue& cur = queues[i];
             if (std::find(cur.data.cbegin(), cur.data.cend(), uid) != cur.data.cend()) {
                 return i;
             }
@@ -40,8 +40,8 @@ struct ThreadQueueList {
         return -1;
     }
 
-    T get_first() {
-        Queue* cur = first;
+    [[nodiscard]] T get_first() const {
+        const Queue* cur = first;
         while (cur != nullptr) {
             if (!cur->data.empty()) {
                 return cur->data.front();
@@ -117,7 +117,7 @@ struct ThreadQueueList {
         first = nullptr;
     }
 
-    bool empty(Priority priority) const {
+    [[nodiscard]] bool empty(Priority priority) const {
         const Queue* cur = &queues[priority];
         return cur->data.empty();
     }

src/common/threadsafe_queue.h

@@ -25,15 +25,15 @@ public:
         delete read_ptr;
     }
 
-    std::size_t Size() const {
+    [[nodiscard]] std::size_t Size() const {
         return size.load();
     }
 
-    bool Empty() const {
+    [[nodiscard]] bool Empty() const {
         return Size() == 0;
     }
 
-    T& Front() const {
+    [[nodiscard]] T& Front() const {
         return read_ptr->current;
     }
 
@@ -130,15 +130,15 @@ private:
 template <typename T>
 class MPSCQueue {
 public:
-    std::size_t Size() const {
+    [[nodiscard]] std::size_t Size() const {
         return spsc_queue.Size();
     }
 
-    bool Empty() const {
+    [[nodiscard]] bool Empty() const {
         return spsc_queue.Empty();
     }
 
-    T& Front() const {
+    [[nodiscard]] T& Front() const {
         return spsc_queue.Front();
     }
 

src/common/timer.h

@@ -19,18 +19,18 @@ public:
 
     // The time difference is always returned in milliseconds, regardless of alternative internal
     // representation
-    std::chrono::milliseconds GetTimeDifference();
+    [[nodiscard]] std::chrono::milliseconds GetTimeDifference();
     void AddTimeDifference();
 
-    static std::chrono::seconds GetTimeSinceJan1970();
-    static std::chrono::seconds GetLocalTimeSinceJan1970();
-    static double GetDoubleTime();
+    [[nodiscard]] static std::chrono::seconds GetTimeSinceJan1970();
+    [[nodiscard]] static std::chrono::seconds GetLocalTimeSinceJan1970();
+    [[nodiscard]] static double GetDoubleTime();
 
-    static std::string GetTimeFormatted();
-    std::string GetTimeElapsedFormatted() const;
-    std::chrono::milliseconds GetTimeElapsed();
+    [[nodiscard]] static std::string GetTimeFormatted();
+    [[nodiscard]] std::string GetTimeElapsedFormatted() const;
+    [[nodiscard]] std::chrono::milliseconds GetTimeElapsed();
 
-    static std::chrono::milliseconds GetTimeMs();
+    [[nodiscard]] static std::chrono::milliseconds GetTimeMs();
 
 private:
     std::chrono::milliseconds m_LastTime;

src/common/vector_math.h

@@ -64,15 +64,15 @@ public:
     constexpr Vec2(const T& x_, const T& y_) : x(x_), y(y_) {}
 
     template <typename T2>
-    constexpr Vec2<T2> Cast() const {
+    [[nodiscard]] constexpr Vec2<T2> Cast() const {
         return Vec2<T2>(static_cast<T2>(x), static_cast<T2>(y));
     }
 
-    static constexpr Vec2 AssignToAll(const T& f) {
+    [[nodiscard]] static constexpr Vec2 AssignToAll(const T& f) {
         return Vec2{f, f};
     }
 
-    constexpr Vec2<decltype(T{} + T{})> operator+(const Vec2& other) const {
+    [[nodiscard]] constexpr Vec2<decltype(T{} + T{})> operator+(const Vec2& other) const {
         return {x + other.x, y + other.y};
     }
     constexpr Vec2& operator+=(const Vec2& other) {
@@ -80,7 +80,7 @@ public:
         y += other.y;
         return *this;
     }
-    constexpr Vec2<decltype(T{} - T{})> operator-(const Vec2& other) const {
+    [[nodiscard]] constexpr Vec2<decltype(T{} - T{})> operator-(const Vec2& other) const {
         return {x - other.x, y - other.y};
     }
     constexpr Vec2& operator-=(const Vec2& other) {
@@ -90,15 +90,15 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec2<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
+    [[nodiscard]] constexpr Vec2<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y};
     }
-    constexpr Vec2<decltype(T{} * T{})> operator*(const Vec2& other) const {
+    [[nodiscard]] constexpr Vec2<decltype(T{} * T{})> operator*(const Vec2& other) const {
         return {x * other.x, y * other.y};
     }
 
     template <typename V>
-    constexpr Vec2<decltype(T{} * V{})> operator*(const V& f) const {
+    [[nodiscard]] constexpr Vec2<decltype(T{} * V{})> operator*(const V& f) const {
         return {x * f, y * f};
     }
 
@@ -109,7 +109,7 @@ public:
     }
 
     template <typename V>
-    constexpr Vec2<decltype(T{} / V{})> operator/(const V& f) const {
+    [[nodiscard]] constexpr Vec2<decltype(T{} / V{})> operator/(const V& f) const {
         return {x / f, y / f};
     }
 
@@ -119,18 +119,18 @@ public:
         return *this;
     }
 
-    constexpr T Length2() const {
+    [[nodiscard]] constexpr T Length2() const {
         return x * x + y * y;
     }
 
     // Only implemented for T=float
-    float Length() const;
-    float Normalize(); // returns the previous length, which is often useful
+    [[nodiscard]] float Length() const;
+    [[nodiscard]] float Normalize(); // returns the previous length, which is often useful
 
-    constexpr T& operator[](std::size_t i) {
+    [[nodiscard]] constexpr T& operator[](std::size_t i) {
         return *((&x) + i);
     }
-    constexpr const T& operator[](std::size_t i) const {
+    [[nodiscard]] constexpr const T& operator[](std::size_t i) const {
         return *((&x) + i);
     }
 
@@ -140,46 +140,46 @@ public:
     }
 
     // Common aliases: UV (texel coordinates), ST (texture coordinates)
-    constexpr T& u() {
+    [[nodiscard]] constexpr T& u() {
         return x;
     }
-    constexpr T& v() {
+    [[nodiscard]] constexpr T& v() {
         return y;
     }
-    constexpr T& s() {
+    [[nodiscard]] constexpr T& s() {
         return x;
     }
-    constexpr T& t() {
+    [[nodiscard]] constexpr T& t() {
         return y;
     }
 
-    constexpr const T& u() const {
+    [[nodiscard]] constexpr const T& u() const {
         return x;
     }
-    constexpr const T& v() const {
+    [[nodiscard]] constexpr const T& v() const {
         return y;
     }
-    constexpr const T& s() const {
+    [[nodiscard]] constexpr const T& s() const {
         return x;
     }
-    constexpr const T& t() const {
+    [[nodiscard]] constexpr const T& t() const {
         return y;
     }
 
     // swizzlers - create a subvector of specific components
-    constexpr Vec2 yx() const {
+    [[nodiscard]] constexpr Vec2 yx() const {
         return Vec2(y, x);
     }
-    constexpr Vec2 vu() const {
+    [[nodiscard]] constexpr Vec2 vu() const {
         return Vec2(y, x);
     }
-    constexpr Vec2 ts() const {
+    [[nodiscard]] constexpr Vec2 ts() const {
         return Vec2(y, x);
     }
 };
 
 template <typename T, typename V>
-constexpr Vec2<T> operator*(const V& f, const Vec2<T>& vec) {
+[[nodiscard]] constexpr Vec2<T> operator*(const V& f, const Vec2<T>& vec) {
     return Vec2<T>(f * vec.x, f * vec.y);
 }
 
@@ -220,15 +220,15 @@ public:
     constexpr Vec3(const T& x_, const T& y_, const T& z_) : x(x_), y(y_), z(z_) {}
 
     template <typename T2>
-    constexpr Vec3<T2> Cast() const {
+    [[nodiscard]] constexpr Vec3<T2> Cast() const {
         return Vec3<T2>(static_cast<T2>(x), static_cast<T2>(y), static_cast<T2>(z));
     }
 
-    static constexpr Vec3 AssignToAll(const T& f) {
+    [[nodiscard]] static constexpr Vec3 AssignToAll(const T& f) {
         return Vec3(f, f, f);
     }
 
-    constexpr Vec3<decltype(T{} + T{})> operator+(const Vec3& other) const {
+    [[nodiscard]] constexpr Vec3<decltype(T{} + T{})> operator+(const Vec3& other) const {
         return {x + other.x, y + other.y, z + other.z};
     }
 
@@ -239,7 +239,7 @@ public:
         return *this;
     }
 
-    constexpr Vec3<decltype(T{} - T{})> operator-(const Vec3& other) const {
+    [[nodiscard]] constexpr Vec3<decltype(T{} - T{})> operator-(const Vec3& other) const {
         return {x - other.x, y - other.y, z - other.z};
     }
 
@@ -251,16 +251,16 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec3<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
+    [[nodiscard]] constexpr Vec3<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y, -z};
     }
 
-    constexpr Vec3<decltype(T{} * T{})> operator*(const Vec3& other) const {
+    [[nodiscard]] constexpr Vec3<decltype(T{} * T{})> operator*(const Vec3& other) const {
         return {x * other.x, y * other.y, z * other.z};
     }
 
     template <typename V>
-    constexpr Vec3<decltype(T{} * V{})> operator*(const V& f) const {
+    [[nodiscard]] constexpr Vec3<decltype(T{} * V{})> operator*(const V& f) const {
         return {x * f, y * f, z * f};
     }
 
@@ -270,7 +270,7 @@ public:
         return *this;
     }
     template <typename V>
-    constexpr Vec3<decltype(T{} / V{})> operator/(const V& f) const {
+    [[nodiscard]] constexpr Vec3<decltype(T{} / V{})> operator/(const V& f) const {
         return {x / f, y / f, z / f};
     }
 
@@ -280,20 +280,20 @@ public:
         return *this;
     }
 
-    constexpr T Length2() const {
+    [[nodiscard]] constexpr T Length2() const {
         return x * x + y * y + z * z;
     }
 
     // Only implemented for T=float
-    float Length() const;
-    Vec3 Normalized() const;
-    float Normalize(); // returns the previous length, which is often useful
+    [[nodiscard]] float Length() const;
+    [[nodiscard]] Vec3 Normalized() const;
+    [[nodiscard]] float Normalize(); // returns the previous length, which is often useful
 
-    constexpr T& operator[](std::size_t i) {
+    [[nodiscard]] constexpr T& operator[](std::size_t i) {
         return *((&x) + i);
     }
 
-    constexpr const T& operator[](std::size_t i) const {
+    [[nodiscard]] constexpr const T& operator[](std::size_t i) const {
         return *((&x) + i);
     }
 
@@ -304,63 +304,63 @@ public:
     }
 
     // Common aliases: UVW (texel coordinates), RGB (colors), STQ (texture coordinates)
-    constexpr T& u() {
+    [[nodiscard]] constexpr T& u() {
         return x;
     }
-    constexpr T& v() {
+    [[nodiscard]] constexpr T& v() {
         return y;
     }
-    constexpr T& w() {
+    [[nodiscard]] constexpr T& w() {
         return z;
     }
 
-    constexpr T& r() {
+    [[nodiscard]] constexpr T& r() {
         return x;
     }
-    constexpr T& g() {
+    [[nodiscard]] constexpr T& g() {
         return y;
     }
-    constexpr T& b() {
+    [[nodiscard]] constexpr T& b() {
         return z;
     }
 
-    constexpr T& s() {
+    [[nodiscard]] constexpr T& s() {
         return x;
     }
-    constexpr T& t() {
+    [[nodiscard]] constexpr T& t() {
         return y;
     }
-    constexpr T& q() {
+    [[nodiscard]] constexpr T& q() {
         return z;
     }
 
-    constexpr const T& u() const {
+    [[nodiscard]] constexpr const T& u() const {
         return x;
     }
-    constexpr const T& v() const {
+    [[nodiscard]] constexpr const T& v() const {
         return y;
     }
-    constexpr const T& w() const {
+    [[nodiscard]] constexpr const T& w() const {
         return z;
     }
 
-    constexpr const T& r() const {
+    [[nodiscard]] constexpr const T& r() const {
         return x;
     }
-    constexpr const T& g() const {
+    [[nodiscard]] constexpr const T& g() const {
         return y;
     }
-    constexpr const T& b() const {
+    [[nodiscard]] constexpr const T& b() const {
         return z;
     }
 
-    constexpr const T& s() const {
+    [[nodiscard]] constexpr const T& s() const {
         return x;
     }
-    constexpr const T& t() const {
+    [[nodiscard]] constexpr const T& t() const {
         return y;
     }
-    constexpr const T& q() const {
+    [[nodiscard]] constexpr const T& q() const {
         return z;
     }
 
@@ -369,7 +369,7 @@ public:
 // _DEFINE_SWIZZLER2 defines a single such function, DEFINE_SWIZZLER2 defines all of them for all
 // component names (x<->r) and permutations (xy<->yx)
 #define _DEFINE_SWIZZLER2(a, b, name)                                                              \
-    constexpr Vec2<T> name() const {                                                               \
+    [[nodiscard]] constexpr Vec2<T> name() const {                                                 \
         return Vec2<T>(a, b);                                                                      \
     }
 #define DEFINE_SWIZZLER2(a, b, a2, b2, a3, b3, a4, b4)                                             \
@@ -390,7 +390,7 @@ public:
 };
 
 template <typename T, typename V>
-constexpr Vec3<T> operator*(const V& f, const Vec3<T>& vec) {
+[[nodiscard]] constexpr Vec3<T> operator*(const V& f, const Vec3<T>& vec) {
     return Vec3<T>(f * vec.x, f * vec.y, f * vec.z);
 }
 
@@ -439,16 +439,16 @@ public:
         : x(x_), y(y_), z(z_), w(w_) {}
 
     template <typename T2>
-    constexpr Vec4<T2> Cast() const {
+    [[nodiscard]] constexpr Vec4<T2> Cast() const {
         return Vec4<T2>(static_cast<T2>(x), static_cast<T2>(y), static_cast<T2>(z),
                         static_cast<T2>(w));
     }
 
-    static constexpr Vec4 AssignToAll(const T& f) {
+    [[nodiscard]] static constexpr Vec4 AssignToAll(const T& f) {
         return Vec4(f, f, f, f);
     }
 
-    constexpr Vec4<decltype(T{} + T{})> operator+(const Vec4& other) const {
+    [[nodiscard]] constexpr Vec4<decltype(T{} + T{})> operator+(const Vec4& other) const {
         return {x + other.x, y + other.y, z + other.z, w + other.w};
     }
 
@@ -460,7 +460,7 @@ public:
         return *this;
     }
 
-    constexpr Vec4<decltype(T{} - T{})> operator-(const Vec4& other) const {
+    [[nodiscard]] constexpr Vec4<decltype(T{} - T{})> operator-(const Vec4& other) const {
         return {x - other.x, y - other.y, z - other.z, w - other.w};
     }
 
@@ -473,16 +473,16 @@ public:
     }
 
     template <typename U = T>
-    constexpr Vec4<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
+    [[nodiscard]] constexpr Vec4<std::enable_if_t<std::is_signed_v<U>, U>> operator-() const {
         return {-x, -y, -z, -w};
     }
 
-    constexpr Vec4<decltype(T{} * T{})> operator*(const Vec4& other) const {
+    [[nodiscard]] constexpr Vec4<decltype(T{} * T{})> operator*(const Vec4& other) const {
         return {x * other.x, y * other.y, z * other.z, w * other.w};
     }
 
     template <typename V>
-    constexpr Vec4<decltype(T{} * V{})> operator*(const V& f) const {
+    [[nodiscard]] constexpr Vec4<decltype(T{} * V{})> operator*(const V& f) const {
         return {x * f, y * f, z * f, w * f};
     }
 
@@ -493,7 +493,7 @@ public:
     }
 
     template <typename V>
-    constexpr Vec4<decltype(T{} / V{})> operator/(const V& f) const {
+    [[nodiscard]] constexpr Vec4<decltype(T{} / V{})> operator/(const V& f) const {
         return {x / f, y / f, z / f, w / f};
     }
 
@@ -503,15 +503,15 @@ public:
         return *this;
     }
 
-    constexpr T Length2() const {
+    [[nodiscard]] constexpr T Length2() const {
         return x * x + y * y + z * z + w * w;
     }
 
-    constexpr T& operator[](std::size_t i) {
+    [[nodiscard]] constexpr T& operator[](std::size_t i) {
         return *((&x) + i);
     }
 
-    constexpr const T& operator[](std::size_t i) const {
+    [[nodiscard]] constexpr const T& operator[](std::size_t i) const {
         return *((&x) + i);
     }
 
@@ -523,29 +523,29 @@ public:
     }
 
     // Common alias: RGBA (colors)
-    constexpr T& r() {
+    [[nodiscard]] constexpr T& r() {
         return x;
     }
-    constexpr T& g() {
+    [[nodiscard]] constexpr T& g() {
         return y;
     }
-    constexpr T& b() {
+    [[nodiscard]] constexpr T& b() {
         return z;
     }
-    constexpr T& a() {
+    [[nodiscard]] constexpr T& a() {
         return w;
     }
 
-    constexpr const T& r() const {
+    [[nodiscard]] constexpr const T& r() const {
         return x;
     }
-    constexpr const T& g() const {
+    [[nodiscard]] constexpr const T& g() const {
         return y;
     }
-    constexpr const T& b() const {
+    [[nodiscard]] constexpr const T& b() const {
         return z;
     }
-    constexpr const T& a() const {
+    [[nodiscard]] constexpr const T& a() const {
         return w;
     }
 
@@ -557,7 +557,7 @@ public:
 // DEFINE_SWIZZLER2_COMP2 defines two component functions for all component names (x<->r) and
 // permutations (xy<->yx)
 #define _DEFINE_SWIZZLER2(a, b, name)                                                              \
-    constexpr Vec2<T> name() const {                                                               \
+    [[nodiscard]] constexpr Vec2<T> name() const {                                                 \
         return Vec2<T>(a, b);                                                                      \
     }
 #define DEFINE_SWIZZLER2_COMP1(a, a2)                                                              \
@@ -584,7 +584,7 @@ public:
 #undef _DEFINE_SWIZZLER2
 
 #define _DEFINE_SWIZZLER3(a, b, c, name)                                                           \
-    constexpr Vec3<T> name() const {                                                               \
+    [[nodiscard]] constexpr Vec3<T> name() const {                                                 \
         return Vec3<T>(a, b, c);                                                                   \
     }
 #define DEFINE_SWIZZLER3_COMP1(a, a2)                                                              \
@@ -618,7 +618,7 @@ public:
 };
 
 template <typename T, typename V>
-constexpr Vec4<decltype(V{} * T{})> operator*(const V& f, const Vec4<T>& vec) {
+[[nodiscard]] constexpr Vec4<decltype(V{} * T{})> operator*(const V& f, const Vec4<T>& vec) {
     return {f * vec.x, f * vec.y, f * vec.z, f * vec.w};
 }
 
@@ -630,30 +630,32 @@ constexpr decltype(T{} * T{} + T{} * T{}) Dot(const Vec2<T>& a, const Vec2<T>& b
 }
 
 template <typename T>
-constexpr decltype(T{} * T{} + T{} * T{}) Dot(const Vec3<T>& a, const Vec3<T>& b) {
+[[nodiscard]] constexpr decltype(T{} * T{} + T{} * T{}) Dot(const Vec3<T>& a, const Vec3<T>& b) {
     return a.x * b.x + a.y * b.y + a.z * b.z;
 }
 
 template <typename T>
-constexpr decltype(T{} * T{} + T{} * T{}) Dot(const Vec4<T>& a, const Vec4<T>& b) {
+[[nodiscard]] constexpr decltype(T{} * T{} + T{} * T{}) Dot(const Vec4<T>& a, const Vec4<T>& b) {
     return a.x * b.x + a.y * b.y + a.z * b.z + a.w * b.w;
 }
 
 template <typename T>
-constexpr Vec3<decltype(T{} * T{} - T{} * T{})> Cross(const Vec3<T>& a, const Vec3<T>& b) {
+[[nodiscard]] constexpr Vec3<decltype(T{} * T{} - T{} * T{})> Cross(const Vec3<T>& a,
+                                                                    const Vec3<T>& b) {
     return {a.y * b.z - a.z * b.y, a.z * b.x - a.x * b.z, a.x * b.y - a.y * b.x};
 }
 
 // linear interpolation via float: 0.0=begin, 1.0=end
 template <typename X>
-constexpr decltype(X{} * float{} + X{} * float{}) Lerp(const X& begin, const X& end,
+[[nodiscard]] constexpr decltype(X{} * float{} + X{} * float{}) Lerp(const X& begin, const X& end,
                                                                      const float t) {
     return begin * (1.f - t) + end * t;
 }
 
 // linear interpolation via int: 0=begin, base=end
 template <typename X, int base>
-constexpr decltype((X{} * int{} + X{} * int{}) / base) LerpInt(const X& begin, const X& end,
+[[nodiscard]] constexpr decltype((X{} * int{} + X{} * int{}) / base) LerpInt(const X& begin,
+                                                                             const X& end,
                                                                              const int t) {
     return (begin * (base - t) + end * t) / base;
 }
@@ -661,8 +663,8 @@ constexpr decltype((X{} * int{} + X{} * int{}) / base) LerpInt(const X& begin, c
 // bilinear interpolation. s is for interpolating x00-x01 and x10-x11, and t is for the second
 // interpolation.
 template <typename X>
-constexpr auto BilinearInterp(const X& x00, const X& x01, const X& x10, const X& x11, const float s,
-                              const float t) {
+[[nodiscard]] constexpr auto BilinearInterp(const X& x00, const X& x01, const X& x10, const X& x11,
+                                            const float s, const float t) {
     auto y0 = Lerp(x00, x01, s);
     auto y1 = Lerp(x10, x11, s);
     return Lerp(y0, y1, t);
@@ -670,42 +672,42 @@ constexpr auto BilinearInterp(const X& x00, const X& x01, const X& x10, const X&
 
 // Utility vector factories
 template <typename T>
-constexpr Vec2<T> MakeVec(const T& x, const T& y) {
+[[nodiscard]] constexpr Vec2<T> MakeVec(const T& x, const T& y) {
     return Vec2<T>{x, y};
 }
 
 template <typename T>
-constexpr Vec3<T> MakeVec(const T& x, const T& y, const T& z) {
+[[nodiscard]] constexpr Vec3<T> MakeVec(const T& x, const T& y, const T& z) {
     return Vec3<T>{x, y, z};
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const T& x, const T& y, const Vec2<T>& zw) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const T& x, const T& y, const Vec2<T>& zw) {
     return MakeVec(x, y, zw[0], zw[1]);
 }
 
 template <typename T>
-constexpr Vec3<T> MakeVec(const Vec2<T>& xy, const T& z) {
+[[nodiscard]] constexpr Vec3<T> MakeVec(const Vec2<T>& xy, const T& z) {
     return MakeVec(xy[0], xy[1], z);
 }
 
 template <typename T>
-constexpr Vec3<T> MakeVec(const T& x, const Vec2<T>& yz) {
+[[nodiscard]] constexpr Vec3<T> MakeVec(const T& x, const Vec2<T>& yz) {
     return MakeVec(x, yz[0], yz[1]);
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const T& x, const T& y, const T& z, const T& w) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const T& x, const T& y, const T& z, const T& w) {
     return Vec4<T>{x, y, z, w};
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const Vec2<T>& xy, const T& z, const T& w) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const Vec2<T>& xy, const T& z, const T& w) {
     return MakeVec(xy[0], xy[1], z, w);
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const T& x, const Vec2<T>& yz, const T& w) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const T& x, const Vec2<T>& yz, const T& w) {
     return MakeVec(x, yz[0], yz[1], w);
 }
 
@@ -713,17 +715,17 @@ constexpr Vec4<T> MakeVec(const T& x, const Vec2<T>& yz, const T& w) {
 //       Even if someone wanted to use an odd object like Vec2<Vec2<T>>, the compiler would error
 //       out soon enough due to misuse of the returned structure.
 template <typename T>
-constexpr Vec4<T> MakeVec(const Vec2<T>& xy, const Vec2<T>& zw) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const Vec2<T>& xy, const Vec2<T>& zw) {
     return MakeVec(xy[0], xy[1], zw[0], zw[1]);
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const Vec3<T>& xyz, const T& w) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const Vec3<T>& xyz, const T& w) {
     return MakeVec(xyz[0], xyz[1], xyz[2], w);
 }
 
 template <typename T>
-constexpr Vec4<T> MakeVec(const T& x, const Vec3<T>& yzw) {
+[[nodiscard]] constexpr Vec4<T> MakeVec(const T& x, const Vec3<T>& yzw) {
     return MakeVec(x, yzw[0], yzw[1], yzw[2]);
 }
 

src/common/zstd_compression.h

@@ -19,7 +19,8 @@ namespace Common::Compression {
  *
  * @return the compressed data.
  */
-std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32 compression_level);
+[[nodiscard]] std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size,
+                                               s32 compression_level);
 
 /**
  * Compresses a source memory region with Zstandard with the default compression level and returns
@@ -30,7 +31,7 @@ std::vector<u8> CompressDataZSTD(const u8* source, std::size_t source_size, s32
  *
  * @return the compressed data.
  */
-std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size);
+[[nodiscard]] std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_size);
 
 /**
  * Decompresses a source memory region with Zstandard and returns the uncompressed data in a vector.
@@ -39,6 +40,6 @@ std::vector<u8> CompressDataZSTDDefault(const u8* source, std::size_t source_siz
  *
  * @return the decompressed data.
  */
-std::vector<u8> DecompressDataZSTD(const std::vector<u8>& compressed);
+[[nodiscard]] std::vector<u8> DecompressDataZSTD(const std::vector<u8>& compressed);
 
 } // namespace Common::Compression

src/core/hle/service/cecd/cecd.cpp

@@ -1361,7 +1361,8 @@ void Module::CheckAndUpdateFile(const CecDataPathType path_type, const u32 ncch_
     case CecDataPathType::MboxData:
     case CecDataPathType::MboxIcon:
     case CecDataPathType::MboxTitle:
-    default: {}
+    default: {
+    }
     }
 }
 

src/core/movie.h

@@ -42,8 +42,8 @@ public:
         return s_instance;
     }
 
-    void StartPlayback(const std::string& movie_file,
-                       std::function<void()> completion_callback = [] {});
+    void StartPlayback(
+        const std::string& movie_file, std::function<void()> completion_callback = [] {});
     void StartRecording(const std::string& movie_file);
 
     /// Prepare to override the clock before playing back movies

src/input_common/udp/client.cpp

@@ -226,8 +226,7 @@ void TestCommunication(const std::string& host, u16 port, u8 pad_index, u32 clie
         } else {
             failure_callback();
         }
-    })
-        .detach();
+    }).detach();
 }
 
 CalibrationConfigurationJob::CalibrationConfigurationJob(
@@ -281,8 +280,7 @@ CalibrationConfigurationJob::CalibrationConfigurationJob(
         complete_event.Wait();
         socket.Stop();
         worker_thread.join();
-    })
-        .detach();
+    }).detach();
 }
 
 CalibrationConfigurationJob::~CalibrationConfigurationJob() {

src/tests/core/arm/arm_test_common.cpp

@@ -17,7 +17,8 @@ TestEnvironment::TestEnvironment(bool mutable_memory_)
 
     timing = std::make_unique<Core::Timing>(1, 100);
     memory = std::make_unique<Memory::MemorySystem>();
-    kernel = std::make_unique<Kernel::KernelSystem>(*memory, *timing, [] {}, 0, 1, 0);
+    kernel = std::make_unique<Kernel::KernelSystem>(
+        *memory, *timing, [] {}, 0, 1, 0);
 
     kernel->SetCurrentProcess(kernel->CreateProcess(kernel->CreateCodeSet("", 0)));
     page_table = kernel->GetCurrentProcess()->vm_manager.page_table;

src/tests/core/hle/kernel/hle_ipc.cpp

@@ -24,7 +24,8 @@ static std::shared_ptr<Object> MakeObject(Kernel::KernelSystem& kernel) {
 TEST_CASE("HLERequestContext::PopulateFromIncomingCommandBuffer", "[core][kernel]") {
     Core::Timing timing(1, 100);
     Memory::MemorySystem memory;
-    Kernel::KernelSystem kernel(memory, timing, [] {}, 0, 1, 0);
+    Kernel::KernelSystem kernel(
+        memory, timing, [] {}, 0, 1, 0);
     auto [server, client] = kernel.CreateSessionPair();
     HLERequestContext context(kernel, std::move(server), nullptr);
 
@@ -239,7 +240,8 @@ TEST_CASE("HLERequestContext::PopulateFromIncomingCommandBuffer", "[core][kernel
 TEST_CASE("HLERequestContext::WriteToOutgoingCommandBuffer", "[core][kernel]") {
     Core::Timing timing(1, 100);
     Memory::MemorySystem memory;
-    Kernel::KernelSystem kernel(memory, timing, [] {}, 0, 1, 0);
+    Kernel::KernelSystem kernel(
+        memory, timing, [] {}, 0, 1, 0);
     auto [server, client] = kernel.CreateSessionPair();
     HLERequestContext context(kernel, std::move(server), nullptr);
 

src/tests/core/memory/memory.cpp

@@ -13,7 +13,8 @@
 TEST_CASE("Memory::IsValidVirtualAddress", "[core][memory]") {
     Core::Timing timing(1, 100);
     Memory::MemorySystem memory;
-    Kernel::KernelSystem kernel(memory, timing, [] {}, 0, 1, 0);
+    Kernel::KernelSystem kernel(
+        memory, timing, [] {}, 0, 1, 0);
     SECTION("these regions should not be mapped on an empty process") {
         auto process = kernel.CreateProcess(kernel.CreateCodeSet("", 0));
         CHECK(Memory::IsValidVirtualAddress(*process, Memory::PROCESS_IMAGE_VADDR) == false);