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.