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
Retrieves a reference to the underlying double
value (unchecked access).
double& get_double() noexcept;
this->is_double()
== true
(if violated, results in undefined behavior).
No-throw guarantee.
The returned reference is valid as long as *this is alive and no function that invalidates
references is called on *this.