...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
boost::units::root_typeof_helper
// In header: <boost/units/operators.hpp> template<typename Radicand, typename Index> struct root_typeof_helper { // types typedef unspecified type; // specifies the result type // public static functions static BOOST_CONSTEXPR type value(const Radicand &); };
A helper used by root
to take a root of a runtime object using a compile time known index. This template is intended to be specialized. All specializations must conform to the interface shown here. Index
will be either the type passed to pow
or static_rational<N>
for and integer argument, N.