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
This is an older version of Boost and was released in 2024. The current version is 1.89.0.
boost::proto::extends::result
// In header: <boost/proto/extends.hpp>
template<typename Signature>
struct result {
// types
typedef unspecified type;
};