get_double_member_with_default

Description:

[ Version ( since = "1.6" ) ]
public double get_double_member_with_default (string member_name, double default_value)

Convenience function that retrieves the floating point value stored in member_name of this.

If member_name does not exist, does not contain a scalar value, or contains `null`, then default_value is returned instead.

this	a JSON object
member_name	the name of the this member
default_value	the value to return if `member_name` is not valid

the floating point value of the object's member, or the given default