Subject: [ggl] Surprising ADL
From: Barend Gehrels (barend.gehrels)
Date: 2010-07-09 03:56:18
Bruno Lalande wrote:
> Hi ZhouShuangJiang,
>> Talking of ADL, I also found some part of the lib use qualified call to
>> stdlib functions, which will forbid the use of ADL.
>> For example, in
>> boost::geometry::detail::overlay::enrich_containment::enrich(), the
>> qualified std::abs() will forbid the user from using his own abs() for UDT.
> Good catch, we indeed have to remove all those qualified calls to enable ADL.
The std::abs() required a trick, because without it is considered as C
abs (taking an integer). I consulted #boost at IRC on it and they
proposed the solution which is now there. The library calls
geometry::math::abs() internally. That function calls "using std::abs"
to get the right abs, and at the same time enable ADL.
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