...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::numeric::functional::as_zero<T, std_valarray_tag>
// In header: <boost/accumulators/numeric/functional/valarray.hpp> template<typename T> struct as_zero<T, std_valarray_tag> : public std::unary_function< T, remove_const< T >::type > { // public member functions remove_const< T >::type operator()(T &) const; };