Boost
C++ Libraries
...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
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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 > { };