Fix compiler warning 'has virtual functions but non-virtual destructor'

headers/openvr.h

@@ -1582,7 +1582,7 @@ namespace vr
 class IVRSystem
 {
 public:
-
+	virtual ~IVRSystem() {}
 
 	// ------------------------------------
 	// Display Methods
@@ -1966,6 +1966,7 @@ namespace vr
 	class IVRApplications
 	{
 	public:
+		virtual ~IVRApplications() {}
 
 		// ---------------  Application management  --------------- //
 
@@ -2117,6 +2118,8 @@ namespace vr
 	class IVRSettings
 	{
 	public:
+		virtual ~IVRSettings() {}
+
 		virtual const char *GetSettingsErrorNameFromEnum( EVRSettingsError eError ) = 0;
 
 		// Returns true if file sync occurred (force or settings dirty)
@@ -2461,6 +2464,7 @@ enum ChaperoneCalibrationState
 class IVRChaperone
 {
 public:
+	virtual ~IVRChaperone() {}
 
 	/** Get the current state of Chaperone calibration. This state can change at any time during a session due to physical base station changes. **/
 	virtual ChaperoneCalibrationState GetCalibrationState() = 0;
@@ -2521,6 +2525,7 @@ enum EChaperoneImportFlags
 class IVRChaperoneSetup
 {
 public:
+	virtual ~IVRChaperoneSetup() {}
 
 	/** Saves the current working copy to disk */
 	virtual bool CommitWorkingCopy( EChaperoneConfigFile configFile ) = 0;
@@ -2706,6 +2711,8 @@ struct Compositor_CumulativeStats
 class IVRCompositor
 {
 public:
+	virtual ~IVRCompositor() {}
+
 	/** Sets tracking space returned by WaitGetPoses */
 	virtual void SetTrackingSpace( ETrackingUniverseOrigin eOrigin ) = 0;
 
@@ -2973,6 +2980,8 @@ typedef uint32_t VRNotificationId;
 class IVRNotifications
 {
 public:
+	virtual ~IVRNotifications() {}
+
 	/** Create a notification and enqueue it to be shown to the user.
 	* An overlay handle is required to create a notification, as otherwise it would be impossible for a user to act on it.
 	* To create a two-line notification, use a line break ('\n') to split the text into two lines.
@@ -3157,6 +3166,7 @@ namespace vr
 	class IVROverlay
 	{
 	public:
+		virtual ~IVROverlay() {}
 
 		// ---------------------------------------------
 		// Overlay management methods
@@ -3599,6 +3609,7 @@ struct RenderModel_ControllerMode_State_t
 class IVRRenderModels
 {
 public:
+	virtual ~IVRRenderModels() {}
 
 	/** Loads and returns a render model for use in the application. pchRenderModelName should be a render model name
 	* from the Prop_RenderModelName_String property or an absolute path name to a render model on disk. 
@@ -3707,6 +3718,7 @@ namespace vr
 	class IVRExtendedDisplay
 	{
 	public:
+		virtual ~IVRExtendedDisplay() {}
 
 		/** Size and position that the window needs to be on the VR display. */
 		virtual void GetWindowBounds( int32_t *pnX, int32_t *pnY, uint32_t *pnWidth, uint32_t *pnHeight ) = 0;
@@ -3734,6 +3746,8 @@ namespace vr
 class IVRTrackedCamera
 {
 public:
+	virtual ~IVRTrackedCamera() {}
+
 	/** Returns a string for an error */
 	virtual const char *GetCameraErrorNameFromEnum( vr::EVRTrackedCameraError eCameraError ) = 0;
 
@@ -3801,6 +3815,8 @@ enum EVRScreenshotError
 class IVRScreenshots
 {
 public:
+	virtual ~IVRScreenshots() {}
+
 	/** Request a screenshot of the requested type.
 	 *  A request of the VRScreenshotType_Stereo type will always
 	 *  work. Other types will depend on the underlying application
@@ -3896,6 +3912,7 @@ namespace vr
 class IVRResources
 {
 public:
+	virtual ~IVRResources() {}
 
 	// ------------------------------------
 	// Shared Resource Methods
@@ -3922,6 +3939,8 @@ namespace vr
 class IVRDriverManager
 {
 public:
+	virtual ~IVRDriverManager() {}
+
 	virtual uint32_t GetDriverCount() const = 0;
 
 	/** Returns the length of the number of bytes necessary to hold this string including the trailing null. */
@@ -4051,6 +4070,7 @@ namespace vr
 	class IVRInput
 	{
 	public:
+		virtual ~IVRInput() {}
 
 		// ---------------  Handle management   --------------- //
 
@@ -4160,6 +4180,8 @@ static const uint64_t k_ulInvalidIOBufferHandle = 0;
 	class IVRIOBuffer
 	{
 	public:
+		virtual ~IVRIOBuffer() {}
+
 		/** opens an existing or creates a new IOBuffer of unSize bytes */
 		virtual vr::EIOBufferError Open( const char *pchPath, vr::EIOBufferMode mode, uint32_t unElementSize, uint32_t unElements, vr::IOBufferHandle_t *pulBuffer ) = 0;
 
@@ -4192,6 +4214,7 @@ namespace vr
 	class IVRSpatialAnchors
 	{
 	public:
+		virtual ~IVRSpatialAnchors() {}
 
 		/** Returns a handle for an spatial anchor described by "descriptor".  On success, pHandle
 		* will contain a handle valid for this session.  Caller can wait for an event or occasionally