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Return the underlying double,
or throw an exception.
double
as_double(
boost::source_location const& loc = BOOST_CURRENT_LOCATION) const;
If is_double()
is true, returns the underlying
double, otherwise throws
an exception.
Strong guarantee.
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Type |
Thrown On |
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boost::system::system_error |
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Name |
Description |
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Constant.
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.