Re: [boost] Small utility templates

From: Victor A. Wagner, Jr. (vawjr_at_[hidden])
Date: 2002-07-25 02:23:42

At Thursday 2002/07/25 00:02, you wrote:
>Hi Boosters,
>
>Victor A. Wagner, Jr. wrote:
>>I've noticed in our coding, we sometimes need a comparison operator that 
>>works on just a single element in a struct, instead of the "entire 
>>struct".  If we need to sort the container using just this "key"; we, of 
>>course, write the comparison function/functor and then:
>[snip]
>>I decided to write a couple templates and helper functions called (the 
>>ones you'd use) less_element() and greater_element().
>
>It is not very flexible.
>What about function objects that are not yet invented?

it's not "flexible" in that sense at all.... they ONLY does < and >.  But 
they ARE useable for std::sort() something that I don't see being able to 
do w/ yours.
I'm reasonably certain they can be improved, but we've got to use MSVC so 
there are limits to how fancy I can get at this point.

>Some time ago I wrote the adaptor class that allows you to wrap 
>*arbitrary* functor (less, greater, etc.) in a uniform manner:
>
>http://www.maciejsobczak.com/prog/snippets.html
>
>(please scroll down the page to the third example - the others are used by 
>me in flame wars with Java extremists ;-) and are not relevant here)
>
>Cheers,
>
>Maciej Sobczak
>http://www.maciejsobczak.com/
>
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Victor A. Wagner Jr.      http://rudbek.com
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