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
Constructor.
template< class T> explicit constexpr with_diagnostics_t( T&& token);
The passed token should
be convertible to CompletionToken.
Strong guarantee. Any exceptions thrown by constructing CompletionToken are propagated.