...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::minus_assign_base
// In header: <boost/accumulators/numeric/functional.hpp> template<typename Left, typename Right, typename EnableIf = void> struct minus_assign_base : public std::binary_function< Left, Right, typeof(lvalue< Left >()-=lvalue< Right >())> { // public member functions result_type operator()(Left &, Right &) const; };