Newsgroups: comp.os.msdos.djgpp From: ma6djh AT bath DOT ac DOT uk (D J Hampson) Subject: Re: Style AND speed in C++? How? Please, I need some radical ideas on this one! Content-Type: text/plain; charset=us-ascii Organization: School of Mathematical Sciences, University of Bath, UK Message-ID: References: <5ji1vt$51i AT info DOT service DOT rug DOT nl> Mime-Version: 1.0 Date: Sat, 26 Apr 1997 18:28:20 GMT Lines: 31 To: djgpp AT delorie DOT com DJ-Gateway: from newsgroup comp.os.msdos.djgpp Precedence: bulk > I'm pretty sure that the overhead of a virtual function call could cause > you some problems. It's OK to use virtual function for setup or > something but don't use it for putpixel or linedraw. I have some quibbles related to this topic. Okay I'm REALLY new to C++ (not C, just C++), so I'd like some hints from experienced C++ people. I'm trying to code everything in C++ tradition now (even though I'll probably only by writing game-type stuff) - since it looks quite smart! The way I was going to do it was to have a screen mode class for whatever mode I'm in (just 320x200x256 to start with), with three private buffers (for triple-buffering), but a public reference to the current buffer to draw in. So it's just as quick as the best C equivalent for putpixel and getpixel, and I can write seperately whatever line drawing routine I want, but I can switch modes (VESA or whatever when I find out how it all works!) completely independantly of the rest. The screen mode class will do all the stuff like set up the screen interrupt code and find the most recently draw screen to chuck on 0xa0000. What I need to know (before I start on this daunting task), is whether all of this is in C++ 'tradition' or whether I'm going to run into trouble somewhere. -- David Hampson e-mail : ma6djh AT bath DOT ac DOT uk Uni Page : http://www.bath.ac.uk/~ma6djh/