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mud:boolean_values [2019/08/08 13:48] (current)
admin created
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 +There are three types of Boolean Values in MUX: BITS, BOOLEAN, and BOOLEAN-Z. In each case, a Boolean Value is either TRUE or FALSE, and all possible strings are mapped onto one of those two.
 +
 +<​code>​
 +   1. The most comprehensive definition of Boolean Value is denoted simply as
 +      BOOLEAN. Newer functions and features use the BOOLEAN definition of a
 +      Boolean Value. ​ MUX maps the following to FALSE:
 +
 +       ​- ​ Numbers (integer and floating-point) with a value of zero.
 +       ​- ​ The Special floating-point values of NaN, Ind, +Inf, and -Inf.
 +       ​- ​ Strings with zero-length.
 +       ​- ​ Any error message of the form "#-N <​msg>"​.
 +
 +      All other strings are understood as TRUE including negative numbers and
 +      dbrefs.
 +
 +   2. BITS is another form of a Boolean value. ​ An integer can be broken down
 +      into BITS. Taken together, the server shows them as an integer, but
 +      there are functions which indirectly manipulate individual BITS.
 +
 +   3. BOOLEAN-Z defines FALSE as an integer zero.  This definition still
 +      appears in MUX for softcode compatibility.
 +
 +      Alphabetic strings are FALSE. ​ Everything after the decimal point in a
 +      floating-point number is ignored. ​ Dbrefs are not recognized but mapped
 +      to FALSE. ​ TRUE is then any non-zero number.
 +
 +</​code>​
 +
 +NOTE: T() allows a BOOLEAN value to be used with a BOOLEAN-Z function, and Boolean Values from functions can be interpreted correctly by either BOOLEAN or BOOLEAN-Z definitions.
 +
 +Examples:
 +<​code>​
 +    not(foo) --> 0      not()    --> 1     ​not(-66) --> 0
 +    not(0) ​  ​-->​ 1      not(#-1) --> 1     ​not(#​12) --> 0
 +    t(1)     ​-->​ 1      t(#​-1) ​  ​-->​ 0     ​t(-66) ​  ​-->​ 1
 +</​code>​
 +
 +Related Topics: [[mud:​not()]],​ [[mud:t()]]
  
mud/boolean_values.txt ยท Last modified: 2019/08/08 13:48 by admin