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
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
Return a reference to the underlying double,
or throw an exception.
double& as_double();
If is_double()
is true, returns a reference
to the underlying double,
otherwise throws an exception.
Constant.
Strong guarantee.
|
Type |
Thrown On |
|---|---|
|
|
|
This function is intended for direct access to the underlying object,
if it has the type double.
It does not convert the underlying object to type double
even if a lossless conversion is possible. If you are not sure which
kind your value has,
and you only care about getting a double
number, consider using to_number instead.