Option :: toThreeState - Get three state value for options
Three state options, which may be set to true (1), false (0) or automatic (-1), can be checked by this function.
The function returns the integer value for the state derived from the string value set for the option passed in sOption.
When the option is not defined or does not match any of the valid values, the function returns the default state passed in iDefaultThree.
Return value: Three state value ( int8 )
Three state values are values, which might be set to three values:
- 1 - true/yes
- 0 - false/no
- -1 - automatic
In many cases, string values can be passed instead of the integer code value.