const type: boolean

Logical type, which consists of the two truth values TRUE and FALSE.

const boolean: FALSE

FALSE is one of the two Boolean truth values. The negation of FALSE is TRUE.

const boolean: TRUE

TRUE is one of the two Boolean truth values. The negation of TRUE is FALSE.

const boolean: (attr boolean) . value

Default value of boolean (FALSE).

const boolean: (attr boolean) . first

Minimum value of boolean (FALSE).

const boolean: (attr boolean) . last

Maximum value of boolean (TRUE).

const func boolean: not (in boolean: boolValue)

Negate a boolean value.

Returns:

TRUE if boolValue is FALSE, FALSE otherwise.

const func boolean: (in boolean: boolValue1) and (ref func boolean: boolValue2)

Logical and for two boolean values. The logical and operator works strictly left to right. If the result can be determined after the evaluation of boolValue1 the right operand (boolValue2) is not evaluated.

Returns:

TRUE if boolValue1 is TRUE and boolValue2 is TRUE, FALSE otherwise.

const func boolean: (in boolean: boolValue1) or (ref func boolean: boolValue2)

Inclusive logical or for two boolean values. The logical or operator works strictly left to right. If the result can be determined after the evaluation of boolValue1 the right operand (boolValue2) is not evaluated.

Returns:

TRUE if boolValue1 is TRUE or boolValue2 is TRUE (or both are true), FALSE otherwise.

const func boolean: (in boolean: boolValue1) = (in boolean: boolValue2)

Check if two boolean values are equal.

Returns:

TRUE if the two boolean values are equal, FALSE otherwise.

const func boolean: (in boolean: boolValue1) <> (in boolean: boolValue2)

Check if two boolean values are not equal.

Returns:

FALSE if the two boolean values are equal, TRUE otherwise.

const func boolean: (in boolean: boolValue1) < (in boolean: boolValue2)

Check if boolValue1 is less than boolValue2.

Returns:

TRUE if boolValue1 is FALSE and boolValue2 is TRUE, FALSE otherwise.

const func boolean: (in boolean: boolValue1) > (in boolean: boolValue2)

Check if boolValue1 is greater than boolValue2.

Returns:

TRUE if boolValue1 is TRUE and boolValue2 is FALSE, FALSE otherwise.

const func boolean: (in boolean: boolValue1) <= (in boolean: boolValue2)

Check if boolValue1 is less than or equal to boolValue2.

Returns:

TRUE if boolValue1 is FALSE or boolValue2 is TRUE, FALSE otherwise.

const func boolean: (in boolean: boolValue1) >= (in boolean: boolValue2)

Check if boolValue1 is greater than or equal to boolValue2.

Returns:

TRUE if boolValue1 is TRUE or boolValue2 is FALSE, FALSE otherwise.

const func integer: (attr integer) conv (in boolean: boolValue)

Conversion from boolean to integer.

Returns:

0 if boolValue is FALSE and 1 if boolValue is TRUE.

const func boolean: (attr boolean) conv (in integer: number)

Convert an integer to a boolean value.

Returns:

FALSE if number is 0, TRUE if number is 1.

Raises:

RANGE_ERROR - If number is neither 0 nor 1.

const func boolean: (attr boolean) parse (in string: stri)

Convert a string to a boolean value.

Returns:

the boolean result of the conversion.

Raises:

RANGE_ERROR - If the string is not equal to "TRUE" or "FALSE".

const func aType: (in boolean: condition) ? (ref func aType: thenValue) : (ref func aType: elseValue)

Ternary operator condition ? thenValue : elseValue

Returns:

thenValue if condition is TRUE, and elseValue if condition is FALSE.

const func integer: compare (in boolean: aBoolean1, in boolean: aBoolean2)

Compare two boolean values..

Returns:

-1, 0 or 1 if the first argument is considered to be respectively less than, equal to, or greater than the second.

const func integer: hashCode (in boolean: aBoolean)

Compute the hash value of a boolean value.

Returns:

the hash value.

const func integer: ord (in boolean: boolValue)

Convert to integer.

Returns:

0 if boolValue is FALSE and 1 if boolValue is TRUE.

const func integer: integer (in boolean: boolValue)

Convert to integer.

Returns:

0 if boolValue is FALSE and 1 if boolValue is TRUE.

const func boolean: boolean (in integer: number)

Convert an integer to a boolean value.

Returns:

FALSE if number is 0, TRUE if number is 1.

Raises:

RANGE_ERROR - If number is neither 0 nor 1.

const func boolean: succ (ref boolean: boolValue)

Successor of a boolean value.

succ(FALSE)  returns  TRUE
succ(TRUE)   raises   RANGE_ERROR

Returns:

TRUE, if the boolean value is FALSE.

Raises:

RANGE_ERROR - If the boolean value is TRUE.

const func boolean: pred (ref boolean: boolValue)

Predecessor of a boolean value.

pred(FALSE)  raises    RANGE_ERROR
pred(TRUE)   returns   FALSE

Returns:

FALSE, if the boolean value is TRUE.

Raises:

RANGE_ERROR - If the boolean value is FALSE.

const proc: incr (inout boolean: boolValue)

Increment a boolean value.

const proc: decr (inout boolean: boolValue)

Decrement a boolean value.

const func string: str (in boolean: aBool)

Convert a boolean value to a string. The boolean value is converted to the string "TRUE" or "FALSE.

Returns:

"TRUE" if aBool is TRUE, "FALSE" otherwise.

Raises:

MEMORY_ERROR - Not enough memory to represent the result.

const func string: literal (in boolean: aBool)

Convert a boolean value to a boolean literal. The boolean value is converted to the string "TRUE" or "FALSE.

Returns:

"TRUE" if aBool is TRUE, "FALSE" otherwise.

Raises:

MEMORY_ERROR - Not enough memory to represent the result.

const func boolean: boolean (in string: stri)

Convert a string to a boolean value.

Returns:

the boolean result of the conversion.

Raises:

RANGE_ERROR - If the string is not equal to "TRUE" or "FALSE".

const func boolean: rand (in boolean: low, in boolean: high)

Compute pseudo-random boolean value in the range [low, high]. The random values are uniform distributed.

Returns:

a random value such that low <= rand(low, high) and rand(low, high) <= high holds.

Raises:

RANGE_ERROR - The range is empty (low > high holds).