...one of the most highly
regarded and expertly designed C++ library projects in the
world.
— Herb Sutter and Andrei
Alexandrescu, C++
Coding Standards
Returns true if this is a number.
bool is_number() const;
This function returns true
when kind()
is one of the following values:
kind::int64
, kind::uint64
,
or kind::double_
.
Constant.
No-throw guarantee.