Small gotcha when combining Boost.Array, Assign, and Test
When attempting to use Boost.Assign's list_of in expressions like BOOST_CHECK_EQUAL(somearray, list_of(x)(y)(z)), where somearray has a type like boost::array<T,N>, I kept running into funky errors that there was no operator<< defined with the appropriate types. So I'd define one at global scope, but the errors kept arising from the depths of BOOST_CHECK_EQUAL. It turns out that I needed to define such an operator<< in the boost namespace:
namespace boost { template< typename charT, typename traits, typename T, ::std::size_t N > ::std::basic_ostream& operator<<( ::std::basic_ostream &os, const ::boost::array &array) { os << '[' << N << "]{ "; ::std::copy(array.begin(), array.end(), ::std::ostream_iterator (os, " ")); os << '}'; return os; } }
2 comments:
fantastic, just what i needed... after many, many attempts to solve. how did you discover this, and more to the point... WHY does it need it? is there not some way of using a using clause to import it from another namespace?
Greaat post thanks
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