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value::as_double (2 of 2 overloads)

Return the underlying double, or throw an exception.

Synopsis
double
as_double() const;
Description

If is_double() is true, returns the underlying double, otherwise throws an exception.

Complexity

Constant.

Exception Safety

Strong guarantee.

Exceptions

Type

Thrown On

boost::system::system_error

! this->is_double().

Note

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.


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