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Dr. Dobb's Developer Library DVD 6 (2010)

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Re: Dr. Dobb's Developer Library DVD 6 (2010)

#51

Post by zzrrt »

zzrrt wrote: post #36
cobbzilla wrote: post #23

A quite memorable article [1] described a “backwards” message-passing technique in C++ using operator overloading so you could do stuff like: obj [1] https://jacobfilipp.com/DrDobbs/articles/DDJ/1996/9608/9608e...

I skimmed the article and haven't gotten out the compiler or source files, but does anyone understand how arg1 and arg2 with space and no operator in between are syntactically valid C++, and what do they do?

Aha, the syntax is actually `button <- setSize << 10 << 20;` according to DEMO.CPP in /1996/9608/dynacpp.zip of the ISO. So operator-() initializes the Message object, operator<<() stores the parameters into it, which is then passed to operator<() to invoke the function. I guess the HTML page was badly transcribed or failed to escape the characters.

Re: Dr. Dobb's Developer Library DVD 6 (2010)

#52

Post by pjmlp »

EdwardCoffin wrote: post #17
pjmlp wrote: post #5

Some interesting stuff you will get out of Dr. Dobbs articles, as someone that was an avid reader. - The Small C compiler set of articles, where you will get the sense not even K&R C was used outside UNIX for quite some time, only a common subset. - The toolbox articles creating a Turbo Vision like framework in Object Pascal - The evolution of Python and related adoption - Strange programing languages like Actor, C@+…

I think it was C+@ (pronounced CAT, as I recall). Edit: pasting a comment of mine from here in 2019 [1]: The language is C+@ [2]. I dug up an article about it in Dr. Dobbs Journal, the October 1993 issue. This does not seem to be the article I am remembering, since it does not go into the instruction interleaving technique anywhere near as much as I remember, but they do mention it and say it was called "beading": Th…

Additional information that I hunted down, given the actual article information.

Folks can get a sense of C+@ from https://jacobfilipp.com/DrDobbs/articles/DDJ/1993/9310/9310b....

The links to the figures still work, as of today.

Re: Dr. Dobb's Developer Library DVD 6 (2010)

#53

Post by cobbzilla »

zzrrt wrote: post #51
zzrrt wrote: post #36

Earlier quoted context omitted.

I skimmed the article and haven't gotten out the compiler or source files, but does anyone understand how arg1 and arg2 with space and no operator in between are syntactically valid C++, and what do they do?

Aha, the syntax is actually `button <- setSize << 10 << 20;` according to DEMO.CPP in /1996/9608/dynacpp.zip of the ISO. So operator-() initializes the Message object, operator<<() stores the parameters into it, which is then passed to operator<() to invoke the function. I guess the HTML page was badly transcribed or failed to escape the characters.

Yes! The linked article didn’t capture all the symbols in the original DDJ article. There were in fact `
    obj
which requires overloading the less-than, unary negation, and the double-less-than operators.
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