Re: nullptr == p_one_past_last

"kanze" <>
Tue, 22 Aug 2006 22:32:35 CST
Frederick Gotham wrote:

Greg Herlihy posted:

A C++ program may not be very portable, but C++ the language

Ridiculous! It's quite easy to keep one's code, and thus one's
program, portable.

It depends on what you are doing. What is quite easy is keeping
the non-portable parts in small, isolated modules so you can
port them as needed, without modifying the rest.

And given the computing landscape of the 70s in which C grew
up - this calculation makes perfect sense: the prospect of
running one program on even more than a single machine (much
less, two different kinds of machines) no doubt seemed to
have far less practical value than the prospect of using a
single computer language to write programs on different
types of computers.

All my code is fully portable. All of it.

So you've never written anything but a toy program. Never used
a GUI, never written anything threaded, never used a socket.
Never been concerned by performance, and had to profile a
program. Never done anything with a filename but copy it.
Never needed options from the command line.

I've done all of these at one time or another, and I don't think
I've ever written anything but the simplest programs which
didn't do at least one of them, generally many of the them.

So the word "portable" when describing C++ really refers to
the language's portability - and not to the portability of
its source code. Consequently, if the ability to program in
C++ across a diverse set of computing hardware is one's
definition of "portable" than, yes, C++ is portable. If on
the other hand, the portability of a computer language is
measured in terms of how easily and reliabily a single
program can made to run on a diverse set of computer
hardware, then "portable C++ code" would be an oxymoron.

No, not all. I am aware of the restrictions and freedoms which
an implementation of C++ may have. With this knowledge, I can
write fully- portable, Standard-compliant code.

How do you start a thread? How do you synchronize a write to
disk? How do you listen on a socket? How do you parse
filenames, to handle a directory tree?

My current application needs all of these. Which means that it
cannot be written in 100% portable C++.

James Kanze GABI Software
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