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
Default constructor.
constexpr with_diagnostics_t();
Only valid if CompletionToken
is default-constructible.
Strong guarantee. Any exceptions thrown by default-constructing CompletionToken are propagated.