[boost] Re: tuple - pair interoperability

From: Fredrik Blomqvist (fredrik_blomqvist_at_[hidden])
Date: 2004-05-07 17:25:37

Jaakko Jarvi wrote:
> On May 4, 2004, at 7:56 PM, Fredrik Blomqvist wrote:
>
>> I think it would be convenient if one could treat std::pair as a
>> boost two-tuple.
>> Both tuples::tie and tuple assignment already work with std::pair but
>> I've noticed that the get<> accessor doesn't.
>>
>> So, I propose a simple extension to tuples::get<> with the obvious
>> semantics:
>> boost::get<0>(p) == p.first
>> boost::get<1>(p) == p.second
>>
> The trouble with get is that pairs live in namespace std, so if pair
> get's are not in std, they won't get found by ADL.
Ah, that's true..

> But if we are willing to live
> with  not having ADL, adding gets for pairs would be fine.
As this was mostly a convenience addition I think it's still ok.
I didn't strive for complete tuple<->pair transparency just slightly
better interoperability.

> Please send a patch or code.
>
Attached patches for:
    tuple/detail/tuple_basic.hpp
    tuple/detail/tuple_basic_no_partial_spec.hpp
    libs/tuple/test/tuple_test_bench.cpp

The code is tested with VC7.1 both using the default tuple_basic.hpp
path (that uses PTS) and forced tuple_basic_no_partial_spec.hpp.
I tried to follow the existing code and thus hope that most/all previous
regressions will pass...

The PTS branch in tuple_basic.hpp also supports the length<> and
element<> metafunctions since I found that to be the least intrusive
way of adding get<>(pair) support. Is this a good thing? (I think so).
Or should the changes be limited to _only_ the get<> accessor?

Making the non PTS path support element<> would require more
changes to the legacy code than I think is reasonable right now(?).
I think it should simply be left disabled.

Only a smaller additional test-suite is added. Don't really know if it's
necessary to expand it and mirror/interleave it with the existing ones?

I haven't made any documentation changes (yet).

Hope this can be added!
// Fredrik Blomqvist

begin 666 tuple_basic_no_partial_spec.patch
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M(" @("\O($UA:V4_at_82!T=7!L90T*(" @("!T96UP;&%T93QT>7!E;F%M92!4
$,3X-"@``
`
end

begin 666 tuple_test_bench.patch
M26YD97_at_Z(&QI8G,O='5P;&4O=&5S="]T=7!L95]T97-T7V)E;F-H+F-P< T*
M/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]/3T]
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M5$535"AG970\,3XH<#,I(#T]('1R=64I.PT**WT-"BL-"BL-"B -"B -"B O
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M+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM+2TM#0I 0" M-#<Q+#$R
M("LU,#4L-B! 0 T*(" @8V]N<U]T97-T*"D[#0H@("!C;VYS=%]T=7!L95]T
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`
end

begin 666 tuple_basic.patch
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