Ensure struct data members are given an initial value

While I don't suspect there are any uninitialize variable bugs
present, it's still good to err on the side of safety and provide
an initial value nonetheless.

examples/island/Island.cpp

@@ -37,8 +37,8 @@ const unsigned int blockCount  = 32;
 
 struct WorkItem
 {
-    sf::Vertex*  targetBuffer;
-    unsigned int index;
+    sf::Vertex*  targetBuffer{};
+    unsigned int index{};
 };
 
 std::deque<WorkItem>     workQueue;
@@ -50,8 +50,8 @@ std::recursive_mutex     workQueueMutex;
 
 struct Setting
 {
-    const char* name;
-    float*      value;
+    const char* name{};
+    float*      value{};
 };
 
 // Terrain noise parameters

examples/shader/Effect.hpp

@@ -74,5 +74,5 @@ private:
     bool        m_isLoaded{};
 
     // NOLINTNEXTLINE(readability-identifier-naming)
-    static const sf::Font* s_font;
+    static inline const sf::Font* s_font{};
 };

examples/shader/Shader.cpp

@@ -21,8 +21,6 @@ std::random_device rd;
 std::mt19937       rng(rd());
 } // namespace
 
-const sf::Font* Effect::s_font = nullptr;
-
 ////////////////////////////////////////////////////////////
 // "Pixelate" fragment shader
 ////////////////////////////////////////////////////////////

include/SFML/Audio/SoundStream.hpp

@@ -55,8 +55,8 @@ public:
     ////////////////////////////////////////////////////////////
     struct Chunk
     {
-        const std::int16_t* samples;     //!< Pointer to the audio samples
-        std::size_t         sampleCount; //!< Number of samples pointed by Samples
+        const std::int16_t* samples{};     //!< Pointer to the audio samples
+        std::size_t         sampleCount{}; //!< Number of samples pointed by Samples
     };
 
     ////////////////////////////////////////////////////////////

include/SFML/Graphics/RenderTarget.hpp

@@ -547,18 +547,18 @@ private:
     ////////////////////////////////////////////////////////////
     struct StatesCache
     {
-        bool                  enable;                //!< Is the cache enabled?
-        bool                  glStatesSet{};         //!< Are our internal GL states set yet?
-        bool                  viewChanged;           //!< Has the current view changed since last draw?
-        bool                  scissorEnabled;        //!< Is scissor testing enabled?
-        bool                  stencilEnabled;        //!< Is stencil testing enabled?
-        BlendMode             lastBlendMode;         //!< Cached blending mode
-        StencilMode           lastStencilMode;       //!< Cached stencil
-        std::uint64_t         lastTextureId;         //!< Cached texture
-        CoordinateType        lastCoordinateType;    //!< Texture coordinate type
-        bool                  texCoordsArrayEnabled; //!< Is GL_TEXTURE_COORD_ARRAY client state enabled?
-        bool                  useVertexCache;        //!< Did we previously use the vertex cache?
-        std::array<Vertex, 4> vertexCache;           //!< Pre-transformed vertices cache
+        bool                  enable{};                //!< Is the cache enabled?
+        bool                  glStatesSet{};           //!< Are our internal GL states set yet?
+        bool                  viewChanged{};           //!< Has the current view changed since last draw?
+        bool                  scissorEnabled{};        //!< Is scissor testing enabled?
+        bool                  stencilEnabled{};        //!< Is stencil testing enabled?
+        BlendMode             lastBlendMode;           //!< Cached blending mode
+        StencilMode           lastStencilMode;         //!< Cached stencil
+        std::uint64_t         lastTextureId{};         //!< Cached texture
+        CoordinateType        lastCoordinateType{};    //!< Texture coordinate type
+        bool                  texCoordsArrayEnabled{}; //!< Is GL_TEXTURE_COORD_ARRAY client state enabled?
+        bool                  useVertexCache{};        //!< Did we previously use the vertex cache?
+        std::array<Vertex, 4> vertexCache{};           //!< Pre-transformed vertices cache
     };
 
     ////////////////////////////////////////////////////////////

include/SFML/Graphics/StencilMode.hpp

@@ -96,7 +96,7 @@ struct SFML_GRAPHICS_API StencilValue
     template <typename T>
     StencilValue(T) = delete;
 
-    unsigned int value = 0u; //!< The stored stencil value
+    unsigned int value{}; //!< The stored stencil value
 };
 
 ////////////////////////////////////////////////////////////

include/SFML/Network/Packet.hpp

@@ -497,8 +497,8 @@ private:
 /// \code
 /// struct MyStruct
 /// {
-///     float       number;
-///     std::int8_t integer;
+///     float       number{};
+///     std::int8_t integer{};
 ///     std::string str;
 /// };
 ///

src/SFML/Network/SocketSelector.cpp

@@ -45,10 +45,10 @@ namespace sf
 ////////////////////////////////////////////////////////////
 struct SocketSelector::SocketSelectorImpl
 {
-    fd_set allSockets;   //!< Set containing all the sockets handles
-    fd_set socketsReady; //!< Set containing handles of the sockets that are ready
-    int    maxSocket;    //!< Maximum socket handle
-    int    socketCount;  //!< Number of socket handles
+    fd_set allSockets{};   //!< Set containing all the sockets handles
+    fd_set socketsReady{}; //!< Set containing handles of the sockets that are ready
+    int    maxSocket{};    //!< Maximum socket handle
+    int    socketCount{};  //!< Number of socket handles
 };
 
 

src/SFML/Window/DRM/DRMContext.cpp

@@ -53,14 +53,14 @@ namespace
 {
 struct DrmFb
 {
-    gbm_bo*       bo;
-    std::uint32_t fbId;
+    gbm_bo*       bo{};
+    std::uint32_t fbId{};
 };
 
 bool            initialized = false;
 sf::priv::Drm   drmNode;
-drmEventContext drmEventCtx;
-pollfd          pollFD;
+drmEventContext drmEventCtx{};
+pollfd          pollFD{};
 gbm_device*     gbmDevice      = nullptr;
 int             contextCount   = 0;
 EGLDisplay      display        = EGL_NO_DISPLAY;

src/SFML/Window/DRM/DRMContext.hpp

@@ -43,16 +43,16 @@ namespace sf::priv
 {
 struct Drm
 {
-    int fileDescriptor;
+    int fileDescriptor{};
 
-    drmModeModeInfoPtr mode;
-    std::uint32_t      crtcId;
-    std::uint32_t      connectorId;
+    drmModeModeInfoPtr mode{};
+    std::uint32_t      crtcId{};
+    std::uint32_t      connectorId{};
 
-    drmModeCrtcPtr originalCrtc;
+    drmModeCrtcPtr originalCrtc{};
 
-    drmModeConnectorPtr savedConnector;
-    drmModeEncoderPtr   savedEncoder;
+    drmModeConnectorPtr savedConnector{};
+    drmModeEncoderPtr   savedEncoder{};
 };
 
 class WindowImplDRM;

src/SFML/Window/GlContext.cpp

@@ -425,7 +425,7 @@ struct GlContext::Impl
     // Structure to track which unshared object belongs to which context
     struct UnsharedGlObject
     {
-        std::uint64_t         contextId;
+        std::uint64_t         contextId{};
         std::shared_ptr<void> object;
     };
 

src/SFML/Window/Unix/WindowImplX11.cpp

@@ -564,17 +564,12 @@ m_cursorGrabbed(m_fullscreen)
 
             struct WMHints
             {
-                unsigned long flags;
-                unsigned long functions;
-                unsigned long decorations;
-                long          inputMode;
-                unsigned long state;
-            };
-
-            auto hints        = WMHints();
-            hints.flags       = MWM_HINTS_FUNCTIONS | MWM_HINTS_DECORATIONS;
-            hints.decorations = 0;
-            hints.functions   = 0;
+                unsigned long flags{MWM_HINTS_FUNCTIONS | MWM_HINTS_DECORATIONS};
+                unsigned long functions{};
+                unsigned long decorations{};
+                long          inputMode{};
+                unsigned long state{};
+            } hints;
 
             if (style & Style::Titlebar)
             {

src/SFML/Window/Win32/JoystickImpl.cpp

@@ -79,9 +79,9 @@ IDirectInput8W* directInput = nullptr;
 
 struct JoystickRecord
 {
-    GUID         guid;
-    unsigned int index;
-    bool         plugged;
+    GUID         guid{};
+    unsigned int index{};
+    bool         plugged{};
 };
 
 using JoystickList = std::vector<JoystickRecord>;
@@ -89,8 +89,8 @@ JoystickList joystickList;
 
 struct JoystickBlacklistEntry
 {
-    unsigned int vendorId;
-    unsigned int productId;
+    unsigned int vendorId{};
+    unsigned int productId{};
 };
 
 using JoystickBlacklist = std::vector<JoystickBlacklistEntry>;

src/SFML/Window/Win32/WglContext.cpp

@@ -286,12 +286,12 @@ int WglContext::selectBestPixelFormat(HDC deviceContext, unsigned int bitsPerPix
     // we can cache the result of the lookup instead of having to perform it multiple times for the same inputs
     struct PixelFormatCacheEntry
     {
-        unsigned int bitsPerPixel;
-        unsigned int depthBits;
-        unsigned int stencilBits;
-        unsigned int antialiasingLevel;
-        bool         pbuffer;
-        int          bestFormat;
+        unsigned int bitsPerPixel{};
+        unsigned int depthBits{};
+        unsigned int stencilBits{};
+        unsigned int antialiasingLevel{};
+        bool         pbuffer{};
+        int          bestFormat{};
     };
 
     static std::mutex                         cacheMutex;

src/SFML/Window/WindowImpl.cpp

@@ -96,9 +96,10 @@ namespace sf::priv
 ////////////////////////////////////////////////////////////
 struct WindowImpl::JoystickStatesImpl
 {
-    JoystickState states[Joystick::Count]; //!< Previous state of the joysticks
+    JoystickState states[Joystick::Count]{}; //!< Previous state of the joysticks
 };
 
+
 ////////////////////////////////////////////////////////////
 std::unique_ptr<WindowImpl> WindowImpl::create(
     VideoMode              mode,

src/SFML/Window/macOS/SFKeyboardModifiersHelper.mm

@@ -54,15 +54,15 @@
 /// Modifiers states
 struct ModifiersState
 {
-    BOOL rightShiftWasDown;
-    BOOL leftShiftWasDown;
-    BOOL rightCommandWasDown;
-    BOOL leftCommandWasDown;
-    BOOL rightAlternateWasDown;
-    BOOL leftAlternateWasDown;
-    BOOL leftControlWasDown;
-    BOOL rightControlWasDown;
-    BOOL capsLockWasOn;
+    BOOL rightShiftWasDown{};
+    BOOL leftShiftWasDown{};
+    BOOL rightCommandWasDown{};
+    BOOL leftCommandWasDown{};
+    BOOL rightAlternateWasDown{};
+    BOOL leftAlternateWasDown{};
+    BOOL leftControlWasDown{};
+    BOOL rightControlWasDown{};
+    BOOL capsLockWasOn{};
 };
 
 

test/Audio/SoundStream.test.cpp

@@ -1,9 +1,24 @@
 #include <SFML/Audio/SoundStream.hpp>
 
+#include <catch2/catch_test_macros.hpp>
+
 #include <type_traits>
 
-static_assert(!std::is_constructible_v<sf::SoundStream>);
-static_assert(!std::is_copy_constructible_v<sf::SoundStream>);
-static_assert(!std::is_copy_assignable_v<sf::SoundStream>);
-static_assert(!std::is_nothrow_move_constructible_v<sf::SoundStream>);
-static_assert(!std::is_nothrow_move_assignable_v<sf::SoundStream>);
+TEST_CASE("[Audio] sf::SoundStream")
+{
+    SECTION("Type traits")
+    {
+        STATIC_CHECK(!std::is_constructible_v<sf::SoundStream>);
+        STATIC_CHECK(!std::is_copy_constructible_v<sf::SoundStream>);
+        STATIC_CHECK(!std::is_copy_assignable_v<sf::SoundStream>);
+        STATIC_CHECK(!std::is_nothrow_move_constructible_v<sf::SoundStream>);
+        STATIC_CHECK(!std::is_nothrow_move_assignable_v<sf::SoundStream>);
+    }
+
+    SECTION("Chunk")
+    {
+        const sf::SoundStream::Chunk chunk;
+        CHECK(chunk.samples == nullptr);
+        CHECK(chunk.sampleCount == 0);
+    }
+}