...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Retrieves the underlying value as an int64
(unchecked access).
constexpr std::int64_t get_int64() const;
this->is_int64()
== true
(if violated, results in undefined behavior).
No-throw guarantee.