...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::proto::is_extension — Boolean metafunction that can be used to enable the operator overloads in the
exops
namespace for the specified non-Proto terminal type.
// In header: <boost/proto/operators.hpp> template<typename T> struct is_extension : is_expr< T > { };