[Boost-bugs] [Boost C++ Libraries] #7470: Functional `using namespace std` causing compilation error with icpc -std=c++0x

Subject: [Boost-bugs] [Boost C++ Libraries] #7470: Functional `using namespace std` causing compilation error with icpc -std=c++0x
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-10-04 18:47:39

#7470: Functional `using namespace std` causing compilation error with icpc
-std=c++0x
------------------------------+---------------------------------------------
 Reporter:  anonymous         |       Owner:  no-maintainer
     Type:  Bugs              |      Status:  new          
Milestone:  To Be Determined  |   Component:  functional   
  Version:  Boost 1.52.0      |    Severity:  Showstopper  
 Keywords:                    |  
------------------------------+---------------------------------------------
 The following two files,
 `boost/functional/hash/detail/float_functions.hpp`
 `boost/functional/hash/detail/hash_float.hpp`

 Contains `using namespace std`, which can cause problems  when compiled
 with `icpc -std=c++11`. For example,

 {{{#!cpp
 #include <boost/thread.hpp>
 int main () {}
 }}}

 which will use and instance `float_hash_value` in
 `boost/functional/hash/detail/hash_float.hpp` will emit an overload error
 about `fpclassify` is ambitious, as both `std::fpclassify` and
 `::fpclassify` are perfect match. (tested on Ubuntu 12.04 with icpc 13).
 This is due to the fact that intel compilers supply its own `math.h`
 header and use its own optimized math functions instead of system headers.
 Change the directive to `using std::fpclassify` solve the issue .

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/7470>
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