To: Dustin Sallings <dustin@spy.net>
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From: Catalin Marinas <catalin.marinas@arm.com>
Date: Fri, 12 Nov 2004 10:37:02 +0000
In-Reply-To: <D04B4770-3438-11D9-9D7F-000393CFE6B8@spy.net> (Dustin
	Sallings's message of "Thu, 11 Nov 2004 15:24:20 -0800")
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Cc: gnu-arch-users@gnu.org, Matthew Palmer <mpalmer@hezmatt.org>
Subject: [Gnu-arch-users] Re: darcs vs tla
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Dustin Sallings <dustin@spy.net> writes:
> 	IN some cases, yeah, quite a bit.  For example, how many lines
> of the equivalent of this (contrived because I'm too lazy to look for
> anything better) example in C?
>
> 	# Create a hash table mapping all of the md5s of the word list
> to the words in the list
> 	ht = dict([ (md5.md5(word).hexdigest(), word) for word in
> words])

I wouldn't compare Python with C (maybe assembler with C is a better
comparison) but Python with C++. C++ does not support list
comprehension but you can probably write the above in a single line
(exept for the variable declarations) using the STL library:

for_each(words.begin(), words.end(), add_to_dict(dict));

You would need the add_to_dict functor (callable object) to get the
md5 sum (from a library) and set dict[md5sum] = word.

If you really want to write this on a single line, you could probably
use the Boost library's lambda expressions
(http://boost.org/libs/lambda/doc/index.html).

Catalin


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