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 the underlying double,
or throw an exception.
double as_double() const;
If is_double()
is true, returns the underlying
double, otherwise throws
an exception.
Constant.
Strong guarantee.
|
Type |
Thrown On |
|---|---|
|
|
|
This function is the const-qualified overload of as_double, which 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.