...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
A type T
fulfills FieldViewFwdIterator
if it fulfills the
LegacyForwardIterator
standard
concept, and std::iterator_traits<T>::reference
is convertible to field_view
.