Returns the double precision floating point value of @value.
It is an error to call this function with a @value of any type other than %G_VARIANT_TYPE_DOUBLE.
Return: a #gdouble
2.24
See Implementation
Returns the double precision floating point value of @value.
It is an error to call this function with a @value of any type other than %G_VARIANT_TYPE_DOUBLE.
Return: a #gdouble