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
format_arg(string_viewname,formattable_refvalue) noexcept;
Constructs an argument from a name and a value.
No-throw guarantee.
Both name and value are stored as views.