Function swap

benchmarks/boost/array.hpp:368–370

    // global swap()
    template<class T, std::size_t N>
    inline void swap (array<T,N>& x, array<T,N>& y) {
        x.swap(y);
    }

#if defined(__SUNPRO_CC)
//  Trac ticket #4757; the Sun Solaris compiler can't handle