X-Git-Url: http://git.tdb.fi/?a=blobdiff_plain;f=source%2Finput%2Fdevice.h;h=b42ed3fde4991feb8d87b05258831585db57efec;hb=69aaca13ae0949acf12056e390cbd1009a8487b2;hp=6a436ab2d8a62f0318b893aefca0ac0b068592b1;hpb=5ffc2443718f5514e4fe27d2aa4ac07022bc4917;p=libs%2Fgui.git

diff --git a/source/input/device.h b/source/input/device.h
index 6a436ab..b42ed3f 100644
--- a/source/input/device.h
+++ b/source/input/device.h
@@ -3,15 +3,24 @@
 
 #include <string>
 #include <vector>
+#include <stdexcept>
 #include <sigc++/signal.h>
 
 namespace Msp {
 namespace Input {
 
+class device_not_available: public std::runtime_error
+{
+public:
+	device_not_available(const std::string &w): std::runtime_error(w) { }
+	virtual ~device_not_available() throw() { }
+};
+
+
 /**
 Base class for input devices.  Input devices have two types of controls:
 buttons and axes.  Buttons are either on or off.  Axes have a floating point
-value in the range [-1, 1].
+value nominally in the range [-1, 1].
 
 Event handlers return a boolean indicating whether the event is considered
 processed.  If a handler returns true, no further handlers are invoked.
@@ -42,9 +51,10 @@ protected:
 	std::vector<char> buttons;
 	std::vector<float> axes;
 
-	Device() { }
+	Device();
 public:
-	virtual ~Device() { }
+	virtual ~Device();
+
 	const std::string &get_name() const { return name; }
 	bool get_button_state(unsigned) const;
 	float get_axis_value(unsigned) const;