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Re: fixing compiler warnings

From: Reinhold Kainhofer
Subject: Re: fixing compiler warnings
Date: Mon, 27 Dec 2010 12:51:25 +0100
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Am Montag, 27. Dezember 2010, um 08:57:14 schrieb Werner LEMBERG:
> I don't have too much experience with C++ code, however, being the
> maintainer of groff, I have studied groff's code a lot, and no, it is
> not common to throw exceptions.  

It's also not good C++ practice to throw exceptions when a virtual function is 
not overloaded by child classes. The proper thing to force child classes to 
implement a virtual function is to use pure virtual functions, ie. in the 
class definition:

class Font_metric {
   virtual get_indexed_char_dimensions (size_t) = 0;
and no implementation of that function. The compiler will then throw an error 
if a child class does not implement that function.


Reinhold Kainhofer, address@hidden,
 * Financial & Actuarial Math., Vienna Univ. of Technology, Austria
 *, DVR: 0005886
 * LilyPond, Music typesetting,

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