Hi Sean, you're right. I've added kC_MSGMAX = 10000, so you should be save in the region 1001-65000. Cheers, Fons. Sean Kelly wrote: > > Hi Fons, > > thanks for the response. I'm guess I'm still worried about casting an > integer outside the range of an Enum, i.e. if the max val in an enum is 8 > then the range of values you can cast an int to is 0:15. According to > Stroustrup's book casting and int outside this range is undefined. If you > set kC_MSGMAX = 1024 then the compiler would be forced to allocate more > bits to the enum and users could safely use messages in the range > [1000,2046] > > cheers > > Sean > > _____________________________________________ > > Sean Kelly > Dept. of Physics > University of California Los Angeles > office tel. (310)-825-6035 > fax (310)-206-4397 > voice mail (310)-259-3747 > _____________________________________________ > > On Sun, 27 Jun 1999, Fons Rademakers wrote: > > > Hi Sean, > > > > the EWidgetMessageTypes enum is just to provide nice nmemonics for the > > message types. The kC_MSGMAX id was not used and I've removed it from > > the enum. Casting to the EWidgetMessageTypes enum is ok. However to prevent > > any clash with future system widgets I propose that user defined message > > types are >1000. For sub-messages the range is always 1-255. > > > > I've added this user message type requirement (>1000) to the documentation > > (in the new header WidgetMessageTypes.h). > > > > > > Cheers, Fons. > > > > > > > > > > Hi Rooters > > > > > > To take advantage of MK_MSG I used statements such as, > > > > > > #define M_NEW_1DHISTO ((EWidgetMessageTypes) 9) > > > > > > Casting an integer outside the range of the enumeration worked (at least > > > on my platform) but I gather this is not the way to go. > > > > > > The comment in the source (TGWidget.h) > > > > > > //--- Widget messages and submessages > > > // (sub messages must be in the range 1-255) > > > // (these should be on a separate include file) > > > > > > seems to indicate that sub-messages can be valued up to 255 but > > > the enumeration has a max val of 8 ? > > > > > > thanks for any help > > > > > > Sean > > > _____________________________________________ > > > > > > Sean Kelly > > > Dept. of Physics > > > University of California Los Angeles > > > office tel. (310)-825-6035 > > > fax (310)-206-4397 > > > voice mail (310)-259-3747 > > > _____________________________________________ > > > > > > > > > > > > -- > > Org: CERN, European Laboratory for Particle Physics. > > Mail: 1211 Geneve 23, Switzerland > > E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 > > WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910 > > -- Org: CERN, European Laboratory for Particle Physics. Mail: 1211 Geneve 23, Switzerland E-Mail: Fons.Rademakers@cern.ch Phone: +41 22 7679248 WWW: http://root.cern.ch/~rdm/ Fax: +41 22 7677910
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