id	summary	reporter	owner	description	type	status	milestone	component	version	severity	resolution	keywords	cc
7470	Functional `using namespace std` causing compilation error with icpc -std=c++0x	anonymous	Daniel James	"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 .

"	Bugs	closed	To Be Determined	hash	Boost 1.52.0	Problem	fixed